A Map to the “Treasure”

Posted on July 17, 2014 by oceanexplorer

I know I repeat myself, but thank you once more for following along on our journey around the world. There are so many people without whom this voyage could not have happened in the way that it did.

As I write this, Bodacious Dream is getting some fresh maintenance from the great folks around Narragansett Bay – namely Hall Spars and Rigging, Hinckley Yachts, North Sails and others.

For now though, I am heading back home to the Midwest to recoup my energies and put back in order the parts of my life that were paused for the circumnavigation.

Before I do that though, I wanted to leave you with a map of where the “treasure” is buried. And by treasure, I mean links to the bounty of sweet fruits and memories of the journey… that were the words we wrote, the photos we took and the videos we shot, as well as the various learning and discovery initiatives that we undertook, and all of which when combined, form an online trove of storied artifacts.

1) LEG RECAPS

First off, all our circumnavigation content resides on BodaciousDreamExpeditions.com

Below are the summary recaps for all four legs of the circumnavigation (plus the pre-circum period) which can be found directly at the following links.

:-: Pre-Circumnavigation – Prior to October 2013 – Newport, RI
:-: Leg 1 – 10/02/13 – 12/03/13 – Newport, RI to Cape Town, S.A.
:-: Leg 2 – 12/21/13 – 2/08/14 – Cape Town to Wellington, New Zealand
:-: Leg 3 – 3/26/14 – 5/1/14 – Wellington, NZ to the Galapagos Islands
:-: Leg 4 – 5/07/14 – 6/14/14 – The Galapagos Islands to Newport, RI

2) OUR BLOG UPDATES

Our many blog posts can all be found in reverse chronological order on the Bodacious Dream Expeditions website at bodaciousdreamexpeditions.com/live-updates/. These posts are are also sub-divided by “categories” of subject matter AND by “date.” Select any category or month to see a list of relevant results.

3) FREQUENTLY ASKED QUESTIONS

Upon arrival back in Newport, I began to gather and respond to some of the more frequently asked questions that were put to me over the course of the voyage. We consolidated them all together on one page, which can be found right here!

4) CIRCUM PHOTOS

Links to our many photos can be found here on our Circum Photos page, while our actual 18 Photo Albums, broken down by “Legs,” can be found here, on the Albums page of our Bodacious Dream Expeditions Facebook Page.

For larger format photos in one complete set, you can also view a curated 123-photo “best-of” slideshow over on Flickr.

5) CIRCUM VIDEOS

A selection of our videos from the Circumnavigation can be found on our Circum Videos page, but all of the videos we have uploaded so far can be viewed on our Bodacious Dream Expeditions YouTube Channel.

6) TEGAN’S SCIENCE NOTES

Throughout the voyage, our Earthwatch scientist, Tegan Mortimer provided us wonderfully insightful science “notes” in support of wherever in the world we were and whatever we were encountering. There were eleven of these reports in all, on a wide range of subjects and a list of those can be found right here!

7) CITIZEN SCIENCE RESOURCES

Tegan was also responsible for helping us set up a wonderful Citizen Science Resources Page, where folks could learn all about the amazing online resources that presently exist to help lead you into the world of citizen science projects. Our various sightings were also added to the Bodacious Dream Expeditions Projects Page on iNaturalist.

8) CIRCUMNAVIGATION EXPLORER GUIDES

Learning and Discovery have always been a primary intention of the voyage. To that end, throughout the expedition, we encouraged those of you who were following our adventure to explore more deeply the wonders and beauty of the natural world that we were traversing by referencing our custom-made Explorer “Study” Guides/ Worksheets. There were eight guides in total and can be found at the links below, where they can also be downloaded in printable form.

:-: Our Watery World
:-: Wind & Weather
:-: Math
:-: Sea Life
:-: Oceanography
:-: Glaciers
:-: Sailboat Glossary
:-: Mentor Guide

9) EXPERT INTERVIEWS

Over the course of the voyage, it was also my pleasure to conducted three sets of interviews with some very knowledgeable friends and sailors, each of whom is an expert in some area of sailing. For true devotees of the art and science of sailing, I think you will find these interviews most enlightening. Thanks to the guys for their participation.

:-: Sailing Navigation – interviews w/ John Hoskins & Matt Scharl

:-: Rigging Technology – an interview w/ Alan Veenstra

:-: Composite Materials Technologies – an interview w/ Lapo Ancillotti

And I think those are the key links. Feel free to contact us with follow-up questions. And we’ll keep you posted when we add anything new and of note.

And a very happy summer to all!

– Dave Rearick

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Tegan’s Science Notes #11: Voyages of Discovery

Posted on June 13, 2014 by oceanexplorer

The ocean is one of the last unexplored frontiers on earth. We know more about the surface of Mars than we do about the bottom of the ocean. For thousands of years, humans have been undertaking voyages of discovery. Whether the goal has been to find land beyond the horizon, to map the ocean currents or to find new animals unknown to science, the ocean has always been and will continue to be a deep source of knowledge which will always change the way we view and understand the world around us.

Today, science is moving in many new directions at once, and a great civic awakening is happening as everyday people armed only with some time and a passion to explore begin to help shape the future of scientific discovery. I have spoken many times in my previous “Science Notes” about what’s happening in the area of “Citizen Science,” but in this post, in recognition of Dave’s incredible feat of single handedly circumnavigating the globe, I’d like to look back at the relatively brief history of oceanic exploration.

The Great Voyages

Until quite recently scientific knowledge of the oceans was very limited. During the 1700s and 1800s, the British Royal Navy dominated the world’s oceans, which made surveying coastlines and mapping the oceans a practical priority for both the navy and for commerce. It was during this period that accurate navigation (and mapmaking) became gradually more dependable in locating precise positions on the earth, using a combination of latitude and longitude, celestial readings and chronometers. Many of these survey voyages carried additional passengers who acted as naturalists collecting botanical, biological, and geological samples which greatly expanded European scientific knowledge of the natural world.

beagle_300

The most famous of these ‘gentlemen naturalists’ was Charles Darwin. I referenced him before in my science note on glaciers, as he was first and foremost a geologist. Over the course of the five years from 1831-1836 that the HMS Beagle surveyed the coastlines of the southern part of South America and tested the accuracy of 22 chronometers at pre-determined points, Darwin was collecting copious observations and samples of geological, biological and botanical nature in these far-fling regions. It was Darwin’s unique ability to weave his observations together into a theoretical whole that so challenged the accepted thought of the day and elevated the Beagle’s second voyage into one of the most famous scientific voyages made in history.

Nearly 40 years after Darwin sailed on the Beagle, a dedicated scientific expedition set off on board the HMS Challenger with the aim “to learn everything about the sea,” – a lofty goal indeed! Findings from this Challenger Expedition laid the groundwork for what would become the science of oceanography. Over the course of five years, Challenger traveled over 70,000 nautical miles conducting scientific exploration with freshly designed equipment and discovering over 4,000 new species of plants and animals.

Mapping the Ocean

No one person has explored and mapped more of the ocean than James Cook. Captain Cook came from humble origins but his skill at mapmaking and navigation led him in 1769 to be put in command of the HMS Endeavour on an expedition to Tahiti to observe the transit of Venus across the Sun. Cook’s mapmaking skills were so accurate that an early map of Newfoundland was used for more than 200 years after he drew it and differs little from modern satellite images.

After visiting Tahiti, the Endeavour continued west to locate the famed “Terra Australis.” There Cook mapped the entire coastline of New Zealand before continuing east to Australia as the first European to land there. Over the next 12 years, Cook would make three voyages on board the HMS Endeavour and HMS Resolution, which explored and mapped previously uncharted areas of the world. As well as providing accurate charts for navigation, Cook’s expeditions also carried scientists who made important observations, especially related to botanical discoveries.

There is a second special connection of Captain Cook’s expeditions to Bodacious Dream. Both his ships, the HMS Endeavour and HMS Resolution are fairly certainly believed to lie as wrecks at the bottom of Narragansett Bay! The Endeavour, after coming out of Cook’s service, was renamed the Lord Sandwich and is one of several vessels which were sunk to blockade Newport Harbor during the American Revolutionary War. The HMS Resolution was sold and rechristened La Liberté, a French whaling vessel, which was damaged in Newport Harbor in the 1790s and left on the shore. Efforts are ongoing by the Rhode Island Marine Archaeology Project (RIMAP) to map and locate not only the Endeavour but also other shipwrecks in Rhode Island waters. You can visit their very informative website, and learn about RIMAP’s work right here, or go to the page on the sunken ships here.

Marshall Island Stick Charts

Not all voyages of discoveries (that we know about) were made by Europeans. The Polynesians and Pacific Islanders had been navigating the South Pacific for thousands of years and likely explored the entire region, an area of over 10 million square miles, well before the period of written history. Along the way, they developed a complex system of navigation, which used stars, the sun, the moon, planets, weather, winds, currents, tides, and natural phenomena like bird migration to help them to travel between the many islands.

An important addition to the history of ocean mapping was the discovery of “stick charts” used by seafarers from the Marshall Islands. These are deceptively simple grids made from small sticks and coconut fronds, which represent the major ocean swells in the South Pacific, with small shells showing the location of islands. The charts showed how the swells interacted with the island shores, the undersea slopes, and currents coming from different directions. While the stick maps were easy to construct, it took many years of study to be able to accurately interpret the real ocean dynamics which they represented.

Mapping the Gulf Stream

As you are well aware from Dave’s journey, the Gulf Stream is a major current in the North Atlantic, which carries warm water from the Caribbean north to the northeast Atlantic and is the strongest surface current in the Atlantic. The impact that the Gulf Stream can have on the length of voyages is tremendous. The first reference to the Gulf Stream is found in a written account of Ponce de Leon’s voyage from Puerto Rico in 1513. American fishermen and whalers plying the waters off the American colonies knew of the current in the late 1600s.

It actually took the insights of none other than Benjamin Franklin, the colonial deputy Postmaster General to make clear the existence of the Gulf Stream when in 1769 he published a chart that showed the direction of the flows. His chart of that time is still remarkably accurate. You can read more of Franklin’s very interesting writing about the Gulf Stream and other marine topics in NOAA’s historical archive right here.

Pathfinder of the Seas

Before the late 1800s, there were few comprehensive charts that showed wind and currents across the whole globe. This changed owing to the efforts of one man, Matthew Fontaine Maury.

Maury joined the US Navy as a young man in 1825 and was posted to the Naval Observatory in 1842, where he began to study ocean currents. By studying and compiling thousands of ships logs he was able to map and calculate the speed of ocean currents based on the deflection of ships from their intended path. He was able to produce maps of average ocean speeds for much of the ocean, which allowed vessels to dramatically reduce the length of their voyages. Maury was nicknamed the “Pathfinder of the Seas” and was integral to the creation of international cooperation in producing accurate hydrological charts for all mariners. He is also referred to as the father of the modern oceanography as well, and his book, The Physical Geography of the Sea, published in 1855, is one of the first books on oceanography.

Modern ocean mapping: Satellites, robots and sonar

Even today, we have only begun to map the ocean. Fortunately, today we have technologies that help us to see below the waves, to scan the ocean floor, to analyze the composition of the water, and to observe how the currents work in real-time. Satellites use the reflectivity of the ocean surface to measure chlorophyll content and sea surface temperature changes. Unmanned robots explore the depth of the ocean collecting readings of temperature, pressure, and salinity. Sonar is used to create high-definition maps of the sea floor. Computers are used to model the movement of currents, the future conditions under changes to currents, temperature and sea level.

Check out these cool websites: Perpetual Ocean and Ocean Motion.

“Standing on the shoulders of giants”

Modern science knows so much more and can do some much more than our predecessors could ever have imagined, but our greater knowledge is only possible because of the amazing feats of those ‘giants’ who set off to explore the world and to challenge the commonly held beliefs and superstitions of their day.

Darwin and the rest, they figured out how the world worked in a more complete sense. Today we are finding out how in flux the natural world is, and how delicate is the balance necessary to sustain life. We now can see with factual accuracy just how fast the natural world is changing.

Every observation Dave logged on iNaturalist (click to see all his sightings listed) or eBird is an important scientific finding, which adds to the wealth of scientific knowledge, now being collected by citizen scientists all over the world. Collecting the type of data needed to understand the broad scale patterns of change occurring all over the globe is increasingly difficult for individual scientists to collect on their own, but by relying on citizens (like you!) to help collect this vital information, it becomes easier to approach important questions.

No matter who or where you are, YOU too can be a scientist!

Join an Earthwatch Expedition. Join iNaturalist or eBird yourself and start tracking what you see around you.

Build a Secchi Disk and use the Secchi App to record your data. Download the mPing App and record your weather. Join Zooniverse and be a scientist from the comfort of your couch. The possibilities are endless!

Explore, discover, and most importantly… have fun!!

For myself, I would like to say that I have had a great time sharing my enthusiasm for the natural world with all of you over the past nine months. Thank you to those of you who reached out and contacted me with thoughts or questions. Keep the Bodacious Dream going and get out and discover!

Wishing you fair winds and following seas,

– Tegan Mortimer
teg.mortimer(AT)gmail(DOT)com

Tegan’s Science Notes #10 – Protecting Marine Biodiversity

Posted on May 30, 2014 by oceanexplorer

This is the tenth in a series of “Science Notes” from from our ocean scientist colleague, Tegan Mortimer, who works with Earthwatch Institute. These postings follow from encounters with nature that I have on the water. Links to all her Science Notes can be on our Citizen-Science Resource Page. – DR

Like gigantic conveyor belts, the tropical oceans span the areas closer to the equator where water temperatures are over 75°. These warm and clear waters tend to have low levels of oxygen and nutrients, the opposite of the cold, nutrient rich waters I’ve written about in earlier Science Notes. This means that though tropical areas in general have low productivity, there are distinct ecosystems in tropical areas like coral reefs and mangroves that have very high productivity and are in fact, some of the most bio-diverse habitats on earth.

:: Coral Reefs: Gardens Under Siege

Despite the lack of nutrients and oxygen present in these warm waters, tropical areas play host to one of the most diverse ecosystems on earth: coral reefs.

Screen Shot 2014-05-30 at 11.59.50 AM A coral reef is made up of many colonies of coral polyps which build the reef structure out of calcium carbonate. Tropical corals contain zooxanthellae, which is tiny algae that lives inside the coral where it photosynthesizes, creating food from sunlight. These algae are also what gives coral its brilliant and diverse colors. This means that coral can only occur in the “photic” zone, where sunlight penetrates the water. Corals polyps feed by extending stinging tentacles outwards to capture small prey and particles in the water column. Corals are related to other stinging animals including sea anemones and jellyfish.

The complex physical structure of a coral reef, some of which are thousands of years old, creates an ideal habitat of many other animals to thrive – from small invertebrates to large animals like sea turtles and sharks. The productivity of many tropical marine areas as well as the related economic activities that center around fishing and tourism are highly dependent on the health of coral reefs.

In today’s changing ocean, coral reefs are under siege. Sea surface temperatures are increasing, atmospheric carbon dioxide is driving up ocean acidity, and overfishing is removing critical fish and invertebrate species at the same time that coastal land development is increasing in many coral reef areas. All of these pressures are contributing to the unprecedented and rapid collapse of coral reefs along with the loss of the unique ecosystem that goes with them. Scientists are racing to learn more about how these ecosystems are functioning under speedily changing conditions and how we might increase the resilience of corals, and help them cope better under a variety of different stressors.

Dr. Carrie Manfrino is an Earthwatch scientist studying just this area, but with an exciting twist called “coral gardening.” A great obstacle to coral resilience is that when large areas of corals disappear, it greatly reduces the ability of larvae to successfully settle in to form new baby corals in new areas. Staghorn and Elkhorn corals are branching corals which are a critical part of the coral ecosystem, but in the Caribbean these corals have decreased by as much as 90% in some areas, due to climate change and development pressures.

In the Cayman Islands, where Dr. Manfrino works, these corals are showing some very promising recovery, and her team is working to find out what characterizes sites where these corals are doing well. Once new sites are identified that match these characteristics, scientists and volunteers transfer baby corals that have been grown in a special coral “nursery” to these new sites. The idea behind this method is to both increase coral cover as well as to maintain islands of coral that are better connected with each other which help increase the production of new coral naturally. This is super exciting science, which is using a variety of new technologies to better understand and manage our impacts on the natural environment. (Here’s a video w/ Dr. Manfrino and her colleagues.)

:: Protecting Special Places

Just like anywhere on earth, special places need special protection. The unique biodiversities supported in tropical areas means that there are many special places in need of protection. This process is usually achieved through the creation of multi-nationally supported Marine Protected Areas or MPA. An MPA usually has one of two purposes, to protect an area that supports rare or important species, or to provide a refuge for animals from fishing. MPAs can vary in size from very small local protected areas to vast areas like those in the map below. The most important thing is that an MPA is large enough to matter and located in the right place so that it can provide the most benefit and achieve its purpose. The idea of designating marine areas to be protected is a relatively new one (2000) when compared to the creation of national parks, which started as early as 1872 with the creation of Yellowstone National Park in the U.S.

Currently just 1% of the ocean is fully protected.

So that the right places can be protected, scientists are studying how different animals use their habitat. It is important to be able to know what places are used for feeding, breeding, and resting so that these important functions can be maintained.

On the Pacific coast of Costa Rica, in an area called Gulfo Dulche, Lenin Oviedo, an Earthwatch scientist, is conducting a research project to study how this pristine area is important to resident and migratory species of dolphins and whales. Bottlenose dolphins, Pantropical spotted dolphins, and humpback whales use this area either as their permanent home or as a way stop during larger migrations. Along with mapping how these different species use the gulf, the research team is interested in how boat traffic and boat noise overlaps with important whale and dolphin areas.

It is common that special places for animals are usually special places for humans too. Healthier ecosystems support the wildlife, which also benefits economic activities like fishing and tourism. It is important to understand how these activities impact the environment to see how they might be better managed.

Farther east in the Bahamas, Annabelle Brooks is another Earthwatch scientist whose research is in studying the spatial movements of juvenile green and hawksbill sea turtles. All species of sea turtle are endangered, so it is very important to protect areas, which are crucial for feeding. This research also allows the team to understand naturally occurring cycles of abundance and movement. As impacts from human activities and climate change become more widespread, this research allows scientists to spot disruptions, which are outside the naturally occurring changes in populations.

Researchers like Oviedo and Brooks use the power of computer modeling to better understand natural change and movement in populations. By combining observations of animals with data about the environment, they create a computer model that tells them which areas are important for specific animals or animal activities based on the environmental characteristics. Then the research team goes back into the field and collects more data which is used to validate the models, to see how good the models are at predicting observations in real life. This technique is very useful for pinpointing large areas that are important for specific animals. The aim of both these projects and many others like them is to better understand essential habitats for these important species so that we can better protect them in a changing ocean.

– Tegan Mortimer <teg.mortimerATgmailDOTcom>

The Roaring World – Galapagos #4

Posted on May 15, 2014 by oceanexplorer

By the time you read this, I will have landed in Panama and commenced the next phase of the journey… traversing through the Panama Canal.

From the amount of large shipping traffic I have been seeing the last few days, I fully expect the experience to be very different from that of the Galapagos Islands, where so much work is being done to better understand, research and protect the islands.

Here in Panama, over 100 years ago, it was of the highest importance for the governments of the world to find a quicker and safer passage between the Pacific and Atlantic Oceans. The amazing canal that was created up and over the wild Isthmus of Panama profoundly changed the course of world commerce, travel and development. Both of these desires – the one to preserve nature as it is, and the other to remake nature to human purposes, are important – though oftentimes, they stand at opposite ends of a lively and ongoing debate.

So by now, you have hopefully had a chance to check out Tegan’s excellent Science Notes on the Galapagos. Before I begin to explore Panama, I have a few more observations to share on the Galapagos.

While I have sent along updates on my initial visit to the Charles Darwin Research Station, and my subsequent visit to North Seymour Island… not to mention my close encounter of the near disastrous kind… my time on the Galapagos Islands also provided me the opportunity to meet quite a few interesting people and to learn something about their particularly unique and passionate pursuits.

While visiting the cafés of Santa Cruz in the evenings, I met turtle experts, tour guides, and other global citizens, not so different from myself… as well as several scientist/sailors who were researching local sea life.

One interesting encounter was with a crew member with the Sea Shepherd organization, widely known for their activist opposition to commercial whaling, who educated me as to some of the organization’s less publicized efforts. As regards the Galapagos specifically, Sea Shepherd has given assistance to local authorities in two different areas; the first was in providing trained sniffing dogs to detect the illegal smuggling of exotic pets like iguanas and sea cucumbers, and secondly, by providing local commercial fishermen with AIS (Automatic Identification System) transmitters so that the authorities, as well as other local fishermen operating legally, can better enforce fishing regulations in their territorial waters and thus better promote the health and vitality of the regional fishing stock.

sea_cucumber_550

As Tegan explains in her report, there have for long been a variety of research projects going on in the Galapagos. She points us to one that our colleagues at Earthwatch are undertaking with the island’s famous Darwin finches.

Once in Panama, we will be close to another great Earthwatch Research project – this one involved in safeguarding whales and dolphins in a still remote southern bay of Western Costa Rica, with the intent of protecting them when tourism starts to expand in that area. The project monitors three species of cetaceans in the gulf: the pantropical spotted dolphin, the bottlenose dolphin, and the humpback whale. By focusing on these cetacean species, they hope to gain knowledge on how to more effectively preserve this beautiful marine ecosystem.

While the Galapagos are a special place that has in recent times become a “hot” destination for the eco-tourism industry, the fact is that places just like the Galapagos exist in one form or another just about everywhere in the world. Most, if not all of these under-developed areas are under similar pressures to withstand the immense pressures put upon the local environment and their populations.

Think about the Galapagos going from 600 residents to 20,000 in less than four decades all the while working to accommodate the growing stream of tourists that come – all of whom need food, lodging and services. Imagine the effect this has on indigenous populations and their traditions, which can easily be overwhelmed by such demands.

One last memory of my time on the Galapagos I would like to share. Last week at the end of a long day working on the boat (and in the rain…) I found myself growing increasingly frustrated with how long it was taking me to get things done. At the end of the workday, as I stepped off the water taxi, I suddenly knew I had to take a walk to Turtle Bay – some 40 minutes away. I had only an hour before public access to the beach was to close, so I hurried off.

The hike took me through a broad patch of cactus and trees, then through low brush and across lava fields at which point, l cleared a rise where ahead of me opened up one of the cleanest and longest stretches of white sand beach I have ever seen.

Turtle Beach

With only a few moments until I had to turn around and walk back, I dug my feet in the sand and watched as surfers rode the waves, hikers walked along the beach, photographers with extra long lenses looked for epic photographs and ghost crabs played tag with the waves and with each other. In just a few minutes’ time, all the frustrations of the day evaporated, and I found myself tucked under nature’s wing … preserved there at the shifting border between sea and shore.

Turtle Beach – Santa Cruz Island – Galapagos

It struck me in that moment how very important it is that places such as Turtle Beach be allowed to exist – specifically such places that still ROAR with a natural beauty that has not yet been compromised and transformed by commercial development, excessive tourism or resource extraction.

How can we keep these places as natural and undisturbed as possible yet still allow them to be publicly available to all? How can we maintain their raw and yet fragile beauty so that they might remain pristine for generations to come?

It’s places like Turtle Bay that help to keep us in touch with our natural world – and with our natural selves! We are not separate from the natural world. Rather we are an absolutely integral part of it – the world’s fate is our fate. As the great Henry David Thoreau famously wrote… ”In wildness is the preservation of the world.”

As the miles click off behind me and I near my transit of the Panama Canal, I come to the close of my time traversing the Pacific Ocean. I know that the crossing of the Canal will be another amazing experience and of an entirely different nature than any that has come before it… but an experience entirely new and unexpected I know it will be… which I suppose is what people like myself awaken each morning intent upon experiencing.

– Dave, Bodacious Dream and (the ready-for-anything) Franklin

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Tegan’s Science Notes #9: The Galápagos

Posted on May 13, 2014 by oceanexplorer

As I write this, I am less than 100 miles from Panama where I will commence a whole new adventure by traversing the Panama Canal.

I do have a few more observations to share about my time in the Galapagos, but while I write those up, I’d like to hand-off here to our ocean scientist colleague Tegan Mortimer, who will share with us yet another in her wondrous series of “Science Notes” (See them all here!) – this new one on the Galapagos, naturally… as seen through the awesome lens of science! Take it away Tegan!

________________________________________________________________________
:: Tegan’s Science Notes #9 – The Galapagos

Sailors called them the Enchanted Isles because strong currents and swirling mists could cause the islands to disappear and reappear right before their eyes. The Galápagos were made famous by Charles Darwin’s visit in 1835 during his voyage on board the HMS Beagle. The observations Darwin made on the islands had a direct impact on the development of his theory of evolution. Today these islands are still an unmatched source of biological wonder and continue to contribute to our study and understanding of the process of evolution.

Despite straddling the equator, the Galápagos do not have a tropical feel. In fact this archipelago is home to the northernmost penguin colony in the world, the only native penguins to be found in the Northern Hemisphere (though the penguins do spend most their time in the Southern Hemisphere, as only the most northern island is above the equator). You’ll remember from my African Penguins post (again, they are all listed on the Citizen Science page) that the KEY is in the water: cold, nutrient-rich water.

Source: http://cmi2.yale.edu/galapagos_public/data.html

The Galápagos Islands are located in a unique area in which can be found the convergence of several currents of tropical and subtropical waters that upwell around the islands. For a long time oceanographers thought that the cold waters surrounding the Galápagos came from the Humboldt Current (also known as the Peru Coastal Current) which runs along the western coast of South America carrying cold Antarctic water northward. However another type of current, called an undercurrent, which runs below and opposite to a surface current, was discovered in 1956. This current, called the Equatorial Undercurrent or Cromwell Current after its discoverer, is now seen as the reason for the island’s cool waters. The Cromwell Current flows eastward the entire length of the equator in the Pacific Ocean at a depth of about 100 meters below the westward flowing surface currents. As the current approaches the Galápagos, it is forced upwards by underwater seamounts forming an upwelling system. The waters then flow westward again as part of the South Equatorial Current.

There is a reason why Darwin’s visit to the Galápagos (as well as other islands) had such an effect on his ideas about evolution and natural selection. Islands often have a large number of endemic species, i.e., those that are found nowhere else. The Galápagos are no exception to this. But why do islands have so many unique animals? Geologically, the Galápagos are fairly young, they are volcanic islands formed sometime between 80 and 90 million years ago. In that time animals had to colonize the newly formed islands from the closest landmass, which is the mainland of South America, over 500 miles away. Of all the animal colonizers that reached the Galápagos, only a few would be able to survive and establish populations, which are the animals that still survive today – many of which Dave talked about in his updates.

When animals colonize islands, a few things often happen. These animals have been ‘released’ from pressures like competition and predation that they were under in their original locale. so they can quickly diversify to take advantage of the many different ecological niches that are available in their new home. These animals often don’t have to worry about predators any longer so they lose many of their anti-predator behaviors. Dave’s story about the baby sea lion illustrates this very point. The parent seals can leave the babies alone while they go hunting, knowing that no predator will attack the vulnerable babies. It may also help explain why the baby sea lion in Dave’s story came right up to the tour group without any hesitation. Among birds, this absence of predators can account for why birds may become flightless (like the cormorant) or lay their eggs on the ground, just as the blue-footed booby does.

These traits make islands very susceptible to the effects that follow from introducing animals like cats, dogs and rats which can easily prey on native animals. Humans too have had a heavy impact on island populations by hunting some animals to extinction. Luckily, today we have come to realize just how fragile these ecosystems are, which has caused many people and organizations to take up the work of protecting such special and “endangered” places… including the Galápagos.

Darwin’s Finches

There’s one group of animals from the Galápagos that needs a special mention. Darwin’s finches are a group of 15 species of birds found throughout the islands which Darwin specifically mentions in his Origin of Species. In this way, these birds became an important part of the scientific history of evolutionary thought, and as I will explain still maintain an important role in our modern understanding of evolution and the ways humans can impact it.

These birds are the classic example the adaptive radiation I mentioned earlier. A colonizer species to the island, the finches diversified into these 15 species all of which have different shaped beaks, each of which is related to what type of food that particular species eats. These birds are thought to be the fastest evolving animals on earth, which means that researchers can follow them, year to year, and track the natural selection pressures which define which species thrive and which do not.

However, another pressure is being placed on them as well. Human foods, like rice, are now widely available in much of these finches’ range. Birds that feed on human foods can lose the characteristics that make them evolutionary ‘fit,’ as earlier selection pressures are no longer being placed on them. The loss of these characteristics can erode the differences between the various species of finches leading to a loss of biodiversity. So instead of 15 different species, which are highly evolved to eat different food sources, it’s possible we may end up with just a few species that feed on human scraps. It would be tragic loss of such an amazing group of birds.

This study of the finches is actually a research project that my colleagues at Earthwatch are conducting in the Galapagos not far from where Dave moored Bodacious Dream. You can find out more about their project called Following Darwin’s Finches in the Galapagos at the link.

– Tegan

:: For more exciting science insights and opportunities, please check out our BDX Explorer Guides or stop by our Citizen Science Resources page, where you can also find all of Tegan’s previous Science Notes, Also, we welcome your input or participation to our BDX Learning and Discovery efforts. You can always reach us at … <oceanexplorer@bodaciousdreamexpeditions.com>

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Tegan’s Science Notes #8: Glaciers

Posted on April 24, 2014 by oceanexplorer

Dave Rearick: As promised, here’s the second half of our Glacier Report, the first part of which with my notes, photos and videos of my trip to Fox Glacier is viewable HERE!

Today’s follow-up post, from our Earthwatch Scientist, Tegan Mortimer summarizes much of what science has learned about glaciers. Tegan knows a lot about glaciers, so I encourage you to read on and learn more about this important subject.

And if you would like to share these learnings with those younger than yourself, be sure to check out our new (and easily printable) Explorer Guide on Glaciers – or engage Tegan or I with questions via email.

So, take it away, Tegan!

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1. The Power of Ice: Discovering the Glacial Landscape

Tegan Mortimer: Did you know that Charles Darwin was a geologist? Many of the thoughts in his most famous work, The Origin of Species were influenced by early discoveries in geomorphology – a field of science which tries to explain how landscapes change based on the pressures placed upon them. Ice is one of the greatest creators of landscapes. Just as Dave described the Great Lakes being carved out by glaciers in his previous post, in that same way was Cape Cod along with many other features of my native Massachusetts coastline also carved out by glaciers. When you really look closer, it’s possible to discover much of the history of a landscape by the way it looks today.

The photo below is of a place in North Wales called Cwm Idwal (in Welsh a “w” is a vowel and is pronounced like “oo”) in the Glyderau Mountains.

Cwm Idal in the Glyderai Mountains of North Wales

Charles Darwin visited Cwm Idwal in 1831 to study the many fossils of ancient marine life that were found in its rocks. What they showed was that this land was once the bottom of the sea! For Darwin and his fellow geologists who were trying to show that landscapes could be shaped and changed in this way, these findings were so exciting that they somehow missed something even bigger!

It was another 10 years before Darwin returned to Cwm Idwal and this time he noticed the very obvious evidence of glaciation on the landscape. Cwm Idwal is what geologists call a “hanging valley” (alternately called a cirque, or a corrie or a cwm), which is the area from which a mountain glacier originates. Below Cwm Idwal, stretches a wide glacial U-shaped valley, which reaches all the way to current sea level. Cwm Idwal and the surrounding area are a wonderful example of “typical” glacial features.

2. How glaciers change the landscape

Glaciers and ice sheets form landscapes through two methods. The first happens when glaciers erode the landscape by scraping up the soil and bedrock after which they then deposit this material in other places.

Depending on the type of rock that a glacier is moving over, different glacial features will be left behind. Soft rocks like sandstone or limestone are easily ground up by the pressure of the ice, while harder rocks like granite are usually eroded through a process called “plucking.” What happens here is that water from the glacier melts into cracks in the rocks which than refreezes. As the ice in the glacier moves, it plucks away pieces of rock which are then trapped in the ice. Water expands when it freezes and is capable of further breaking apart rocks in what is called “freeze-thaw weathering.”

(:: For a fun sidetrip, explore Fox Glacier via Google Earth by clicking on this link or the image above!)

The second method of erosion results in a roche moutonnée or a whaleback, which is an area of exposed bedrock, which has a smooth gently-sloped side and a steep vertical side. The photo below shows a few roche moutonnées which are only a few feet tall, though it is possible to see very large ones as well. Based on the direction of the sloping and angle of the sides you can tell which direction the glacier was moving. Remember that fact, as it will come up again later. The sloping side is the direction the glacier was coming from and the ice grinds down that side of the rock. The steeper sided angle is the direction the glacier was going and here is where that process called plucking happens. The tops of roche moutonnées often have scratches called striations which are horizontal scape marks from the rocks and debris in the ice.

Roche moutonnées

Another erosional feature is called a crag and tail which is a tall hill usually with exposed rock and a gently sloping tail of softer rock behind it. In this case, the steep side of the hill is the direction that the glacier came from. The most famous crag and tail is Edinburgh Castle (pictured to the left) in Edinburgh, Scotland. The crag in a crag and tail is an area of very hard rock, usually a volcanic plug which forms when magma cools inside the vent of a volcano creating a column of very hard rock. When the glacier hits this rock, it can’t erode it, so it is forced to flow around the plug like water flowing around rocks in a stream. The plug protects the softer rock behind it leading to the formation of the tail.

All that eroded material has to go somewhere, so it is that glaciers leave behind particular landforms made up of all that “stuff.” Sediment left behind by glaciers is usually called till, which is made up of sand and gravel and rocks of every size. Erratics are large rocks like the photo below which are left behind by a retreating glacier. Geologists study the mineral structure of erratics to learn where they come from and learn more about the behavior of glaciers and ice sheets.

An Erratic

Glaciers push up ridges of material which are called moraines. These ridges can be formed at the base of the glacier which are called terminal moraines or at the edges of the glacier which are called lateral moraines. Cape Cod and Long Island on the US east coast are areas which have a series of terminal moraines formed thousands of years ago by the Laurentide ice sheet. As a glacier retreats, it can leave behind a series of terminal moraines which reflect the extent of the ice at different periods. Sometimes meltwater from a glacier will be kept from exiting a valley by a terminal moraine and will form a lake.

3. Glaciers Today

So what exactly is a glacier? Dave explained it pretty well; a glacier is essentially a river of ice. A river of ice? Since you can’t see it moving, how can that be? The fact is that glaciers are always on the move. The immense weight of the ice in a glacier causes it to deform internally, which results in unstoppable movement. Gravity and meltwater underneath the glacier can also help it to move downslope. The areas at the edges of the glacier are under less pressure so this is where great cracks in the ice called crevasses form. When pieces of a glacier fall off the base of the glacier it is call calving – which is happening lately at a much increased rate. Here is an incredible high-def clip from a recent movie called “Chasing Ice” that records the longest and biggest calving ever recorded.

We know Fox Glacier is retreating, so how then is it moving downhill? The growth of a glacier is based on something called mass balance. Snow falls on the top of the glacier and freezes while ice from the bottom of the glacier melts or breaks off, a process that is called ablation. As long as the accumulation at the top outweighs the ablation at the bottom, the glacier will grow. However, if the ablation outweighs the accumulation, then the glacier will retreat. This is the case of the Fox Glacier, and unfortunately the case for many glaciers around the world.

4. Does it really matter if the glaciers disappear?

It would most certainly be a tragedy if alpine glaciers were to disappear due to the effects of human climate change. They are majestic places to behold and also provide revenue from tourism to areas in these regions. However, and more importantly, glaciers also provide huge stores of fresh water, which are released throughout the year. For example, about 1.3 billion people depend on Himalayan glaciers for drinking water and other water needs. If these resources were to disappear, it would have devastating effects on human populations.

5. Glaciers of the Past

At times throughout Earth’s history, huge swathes of the planet have been covered by ice. We know that some of these ice sheets covered thousands of miles and could be several miles thick. Such ice ages can last for millions of years and go through a series of glacial and interglacial periods where ice cover increases and decreases. The last ice age started 2.6 million years ago and is still ongoing today. We are currently in an interglacial period called the Holocene, which started 12,000 years ago. When people talk about the “Ice Age” they are usually talking about the previous glacial period, which occurred from 110,000 to 12,000 years ago. The ice was at its greatest expanse just 22,000 years ago when most of the northern half of North America and northern Europe and Asia were covered in ice. In the Southern Hemisphere, the Andes in South America and Southern Alps in New Zealand had large ice caps as well.

The glaciated landscapes of North America, Europe, South America, and New Zealand were formed during this Ice Age.

6. What happens when massive ice sheets disappear?

The most important thing to remember is that ice sheets (and glaciers) hold a huge amount of water. The sea level was about 120 meters lower during the last glacial period than it is today. We still have two major ice sheets on earth, the Antarctic Ice Sheet and the Greenland Ice Sheet. If these were to melt – which they give every indication of doing, and quite rapidly, we would see increases to sea level, which would threaten many coastal cities and sea-dependent communities across the globe.

See all Dave’s photos and videos from Fox Glacier right HERE!

– Tegan

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The Wonder & Science of Bioluminescence

Posted on April 16, 2014 by oceanexplorer

4.16.14 – The boisterous conversation between sky and sea that was supposed to last 12 hours lasted 36 instead and dealt us winds up to 35 knots … making for some fun times. While we are now riding along towards the trade winds, we’re also pushing into the waves of the previous outburst. The cloud cover has been thick, which has prevented us from viewing either the sun or the eclipse of the full moon. This morning however, I was treated to a most wonderful sunrise.

So, while we enjoy the sunshine and mid-70’s temperatures and continue to sort our way towards the Galapagos Islands, we wanted to share our experience of the amazing bio-illumination phenomena that we’ve witnessed several times on this voyage. So, read on to get the story … first my own experience … followed by Tegan Mortimer’s terrific scientific explanation. So that said, let’s get illuminated!

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:: The Wonder of Bioluminescence

Dave Rearick: One afternoon right around New Year’s, not long after leaving Cape Town, I crossed paths with a fishing boat – a traditional colorful wooden boat painted in bright greens, yellows and reds. As our two courses passed, the captain contacted me and we spoke for a few moments over the radio; I found his English was excellent with a smooth, lyrical accent to it. We talked of the beautiful weather and seeing that I was sailing east and away from Africa, he asked me where I was headed. New Zealand I told him … and alone! He marveled at that and wished me great luck, explaining that I should have good weather since it was now summer, and then he told me to watch for the bioluminescence which he assured me I would find very beautiful. With that, we said our goodbyes – he headed off to another fishing ground and I proceeded on my way east.

Up to that point, my direct experience with bioluminescence had been memorable but limited. But a few nights after I left the fisherman, I stepped into a world of bioluminescence that was unlike any I even knew existed. Let me tell you, that fisherman knew of what he spoke.

The experience of sailing through a floating forest of bioluminescence steals away any words you might offer up to describe it.

It is all just so simple and elegant; a photograph would be impossible – though still we try. If I could draw you a picture, I would … but I know even that would fall short.

As I stood and looked forward, Bodacious Dream sailed along, rising up and bumping her way over the tops of small waves, sending out splashes of a wake to either side, which appeared to be lit indirectly from a light beam located directly underneath the boat – but of course there was no light down there. The glowing white froth of the wake glowed bright, artificial and surreal. As if that wasn’t enough on its own, looking back behind the boat provided an intoxicating view.

Bodacious Dream has two rudders, one on each side of the boat approximately 5 feet to each side of the centerline. From the centerline, the hydro-generator drops into the water from the stern of the boat. Standing near the mast of the boat and looking aft, the entire wake of the boat was fully aglow … tossing dancing sparks glittering across the water. Like I said, it was as if Bo had this bright swimming pool light underneath her pointing aft, beyond the transom.

Leaving the foredeck and walking toward the stern and looking over the edge, revealed an entirely different and no less spectacular show.

A couple of feet below the water, off the slender tip of each rudder, there were these luminous streamers – not unlike what you might see flying from the top of tent poles at Renaissance Fairs … long, slender and snaking back and forth in the wind. Looking further under the water, you could see they glowed white-green and extended back for maybe 12 or 15 feet beyond the boat. Wavering back and forth, the ends subdividing into three or four strips, each waving independently and criss-crossing back and forth over each other. Off the centerline and close to the hydro-generator, a plume of glowing white bubbles rose up, not as sleek and mesmerizing as the streamers, but giving a round and ruddy glow to the surrounding waters. The water above, below and all around the rudders and hydro was clear, with all their outer edges carefully defined and illuminated by thous delicate refracted light.

While on one hand, this was something I could have sat and watched for hours, on the other, something about it felt almost indecently beautiful – like something SO beautiful that you felt you shouldn’t stare at it, least it lose its genius and grow too quickly mundane to human eyes. As I continued to stare at it, I felt it expressed something so beyond the eyes of man, that I couldn’t help wonder what other surprises waited for us … out there over the horizon and beyond the stars.

And in the middle of that, I recalled what my fisherman friend had said to me, “Ahh yes … and you will surely enjoy the bioluminescence. It is so beautiful at night. Be safe my friend and have a good journey.” Yes indeed, my friend! Thank you!

– Dave
34.1974S, 109.2991W

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:: Tegan’s Science Notes #7 – The Science of Bioluminescence

As Dave’s story reaffirms, bioluminescence is a truly spectacular phenomenon! Phrases like “a sea of stars” are used to describe what it looks like and that is completely accurate. If you’ve ever seen a firefly or lightning bug, you’ve seen bioluminescence!

But what is it actually? Bioluminescence is the ability for some animals to create light through a chemical process called “chemiluminescence.” Two chemicals are required for this reaction: “luciferin” and either “luciferase” or “photoprotein.” Luciferase is an enzyme that interacts with oxidized (oxygen-added) luciferin in a chemical reaction that results in the creation of light. Some animals create luciferin themselves and some acquire it by eating other animals or by having a symbiotic relationship with a luciferin-creating organism. Bioluminescent shrimp have a symbiotic relationship with luciferin-creating bacteria that lives in their guts. The shrimp gets light and in trade the bacteria get somewhere to live. That’s a symbiotic relationship: everybody wins!

I mentioned fireflies, but most bioluminescent organisms live in the ocean, especially in the deep sea where it is completely dark. The most famous bioluminescent animal of the deep sea is probably the anglerfish, (pictured to the left) which has a bioluminescent lure that hangs directly above its tooth-filled mouth, just waiting for smaller prey to be attracted to the anglerfish’s glowing light.

So what is Dave seeing? It’s definitely NOT thousands of anglerfish under Bodacious Dream! What Dave is seeing is bioluminescent “plankton.” There are many different types of plankton, both “phytoplankton” (little plants) and “zooplankton” (little animals) can be bioluminescent but two types: “copepods” and “dinoflagellates” are the most commonly seen. Unlike the anglerfish that uses its bioluminescence to attract prey, these tiny planktons use bioluminescence to avoid getting eaten. When they are disturbed, either by a predator, or a human diver, or even by a boat like Bodacious Dream moving through the water, they emit a light, which is thought to startle and repel whatever might have been planning on eating the plankton.

Scientists think that some species of sharks and whales put the plankton’s defensive bioluminescence to use in helping the larger creatures to hunt. Sperm whales for example will go to an area with large amounts of bioluminescent plankton. When the plankton’s predators (fish or squid) approach, the plankton’s light alerts the whale who is then able to more easily catch the fish. Neat trick!

– Tegan

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Tegan’s Science Notes #6 – Seabirds

Posted on April 2, 2014 by oceanexplorer

Some days are made interesting merely by their simplicity. Today looks to be one of those. The last 36 hours have made for some demanding sailing. Even though we’ve made good time, it’s taken a lot of patience and effort as the wind has increased, decreased and repeatedly switched directions. Each one of these changes has required that I adjust the course or trim the sails.

Today by dawn, things had settled down and we are now sailing steadily on course, which both simplifies my life onboard and gives me a chance to catch up on other things.

It’s pretty desolate down here in the Southern Ocean. There appears to be little visible sea life other than the mysterious bioluminescence I see occasionally at night and the plethora of seabirds that accompany me on my journey. For the first few days, there were a dozen or so albatross around, floating like soft music in the wake of the boat. Yesterday, I sailed through a flock of smaller white seabirds, but there were many of them – maybe 100 or so, and they kept up with me for several hours.

Today, the crowd has moved on. In its place was one lone, dark brown bird, (I’m going to guess it’s a South Polar Skua) which circled us for quite a while. As if we had entered a courting dance, he would land on the boat, I would chase him with my camera and he would fly off … and shortly resume his same pattern – coming up from behind, drifting a bit, then swooping around behind the sails and stalling just in front of the boat before falling back along the weather side. I would follow him around the boat, probably a couple dozen times before I would give into dizziness and allow him another victory in our simple game.

The days move along out here. I sail, navigate, check systems, watch out for ships, eat, sleep … and repeat. I’m grateful for the routine, as it has given me time to digest some reading material … one of which has been Ernest Hemingway’s Moveable Feast, a selection of short stories of his days in Paris. Two years ago, I found myself in the Lilas Café in Paris that he mentions. I sat on his dedicated stool, watching the many comings and goings of interesting people, just as it happened back in the 1930’s.

In the meantime, our ocean scientist, Tegan Mortimer has another wonderful science note for you directly below here – this one appropriately on seabirds! I strongly encourage you to give it a read. As I watch the birds soar day in and day out, I stand amazed before their beauty and the skill they bring to their aquatic lives.

Sailing along here … oh, let’s see … at coordinates … 46.81776S, 161.104W

– Dave

Tegan’s Science Notes #6: Seabirds

Of about 9,700 species of birds on earth, only about 350 are considered seabirds. Think about that – 9,350 species occupy only 30% of the surface on the earth while those 350 species of sea bird ply the vast oceans which constitute 70% of the surface of the globe!

What is a seabird?

The definition of a seabird is a tricky one. Many people use the technical definition that a seabird is a bird which feeds in salt water. However, many coastal and wading birds feed in salt water, but aren’t considered seabirds because they don’t spend enough time at sea. However gulls are considered seabirds though they are strictly coastal and return to land regularly.

The majority of sea birds spend the bulk of their time at sea and only return to land to nest. Therefore they depend on the marine environment for their food and float on the ocean’s surface to rest. The enormous wandering albatross will spend the first seven years of its life at sea before returning to remote islands to breed for the first time.

Who are the seabirds?

I mentioned albatrosses, which are the quintessential seabirds, and gulls which many of us who visit the coast are familiar with. The seabirds also include the petrels, shearwaters, storm-petrels, auks, pelicans, gannets, boobies, skuas, cormorants, shags, frigatebirds, tropic birds and last but certainly not least the penguins.

Many seabirds like the albatrosses and gannets have evolved strong, long wings which allow them to fly long distances without expending much energy, while other seabirds like the auks and penguins have sacrificed flying ability in favor of evolving features which allow for strong swimming ability.

Auks: Razorbill and Puffin

So what birds has Dave seen so far?

Dave has had some fantastic bird sightings. Unfortunately, seabirds can be very difficult to identify, especially the albatrosses of which I am sure Dave has seen more than one species. But this is the list so far of what we’ve been able to identify.

Many of these seabirds are common and widespread in the oceans. In fact, the Wilson’s storm-petrel is believed to be the most numerous bird species in the world with around 12 to 30 million individuals! On the other hand, the gray-headed albatross, cape gannet, and African penguin are classed as endangered because they either have small geographic ranges, small populations or are experiencing significant population declines. So this makes a great list of both common and rare species. Dave spotted a white tern (actually it almost landed on his head!) off the coast of Brazil which is a very unusual sighting for that species in that area.

Dynamic Soaring

Albatross and some other seabirds use a peculiar flying pattern where they make large looping turns which take them up into the air and then they swoop down to almost touch the water and back up again. This is called “dynamic soaring” and it allows these birds to fly without expending much energy. These birds are using the difference in wind speed at different heights to soar. The wind is slower closer to the surface of the ocean due to friction and it becomes faster higher up. The bird starts by climbing up to higher wind speed, and then turns away from the wind and gains airspeed as it soars down the wind gradient. When it turns back into the wind at the water’s surface, the bird has extra energy which allows it to climb back up to higher windspeeds again. Birds which use dynamic soaring have evolved long, thin wings which they hold rigidly in the air as they soar a bit like the wings of a glider.

Additional Resources:

:: Source and good article: whoi.edu/oceanus/feature/a-robotic-albatross

:: Another interesting article: whoi.edu/oceanus/feature/of-wings–waves–and-winds

Seabird Conservation

While it may seem that seabirds that roam the vast oceans are less touched by human impacts that threaten other bird groups, the fact is that seabirds are the MOST threatened group of birds on earth! Of the 346 species of seabird, 101 species (that’s 29%!) are threatened globally and another 10% are classed as “Near Threatened.” And almost half of all seabirds are known or thought to be declining in population. The albatrosses in particular are the most threatened with 17 of 22 species classed as “Threatened by Extinction.” To put it into a little context, of the 10 species that Dave has seen, 30% are threatened and 70% have declining populations!

What’s happening here? Human activities are the greatest contributor. Historically, many seabirds breed on remote islands that are relatively free from land predators, so they often nest on the ground. When ships would occasionally land on these islands, pests like rats were unintentionally introduced. Rats are very destructive to ground nesting birds, eating both eggs and preying on chicks. Luckily, efforts have been made to eradicate such introduced pests from many of these islands.

Today however, other more menacing threats face seabirds. Drowning in fishing gear is one of the greatest threats to seabirds. In the open ocean, fishermen set long lines, miles of baited hooks, which unfortunately catch much more than the fish the fishermen want. Many seabirds hunt from the air, diving to catch prey they have spotted with their sharp eyes. When these baited hooks lay near the surface the birds take the bait, get hooked, and drown. This situation is bad for the birds, but the fishermen don’t want it either as that is a lost piece of bait. Organizations like Birdlife International are working with fishermen in the most affected areas to modify fishing practices to reduce this “bycatch.” The good news is that simple changes can dramatically reduce the number of birds being caught and lost in this manner.

Another threat to seabirds is marine pollution. Laysan albatross are particularly affected with 97% of chicks being found with plastic in their stomachs. The adults are attracted to plastic objects floating at the surface, likely mistaking them for fish eggs or squid. They carry them back to the colonies where they feed them to their chicks. Forty percent of chicks born each year will die due to plastic blocking their guts or other effects of consuming plastic objects. :

::The heavy cost of marine pollution: ocean.si.edu/laysan-albatross-plastic-problem

Seabirds are majestic, elusive and true ocean wanderers, the lone occupants of the air above the ocean, but they could all too easily disappear from these winds. We all have a role to play to protect the ocean and its life, whether it is learning more about marine debris, attending a beach clean up, buying seafood caught with sustainable practices or any other action which improves the ocean environment for all.

– Tegan

(Tegan Mortimer is a scientist with Earthwatch Institute. Contact Tegan directly at Tegan Mortimer <tmortimer (at) earthwatch (dot) org>)

:: For more great science insights and opportunities, please check out our BDX Explorer Guides or stop by our Citizen Science Resources page, where you can also find all of Tegan’s previous Science Notes. Also, we welcome your input or participation to our BDX Learning & Discovery efforts. You can always reach us at … <oceanexplorer@bodaciousdreamexpeditions.com>

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Tegan’s Science Notes #5 – Penguins in Africa?

Posted on March 12, 2014 by oceanexplorer

With Bodacious Dream back in the water in Wellington, a quick update from Dave followed below by an earlier but previously unpublished “science note” on African penguins from our ocean scientist colleague, Tegan Mortimer.

Dave Rearick: Wellington, NZ has a worldwide reputation for windy weather. For the past few days though, it has instead offered up absolutely gorgeous days of clear and sunny skies with winds at less than 15 knots. This has made for perfect conditions to test sail Bodacious Dream after the recent work and refit she just underwent. So far, everything is coming together just fine. Our awesome crew has done a great job getting Bo into shape for Leg 3! (See some pics below in slideshow format.)

Today, we’ll begin the sorting and packing of the boat as forecasts are for wet and windy weather to return this weekend. Our hope after that front passes is to get the go-ahead weather window that we need to depart early next week!

Test sailing … Click the arrows to advance, and scroll over to read the captions.

While we get ready for all that and I head off to do some major provisioning, we wanted to revisit some of Tegan Mortimer’s Science Notes, we didn’t have a chance to publish before now.

We are also readying a wonderfully informative science note on “Seabirds,” which includes a list of all the seabird sightings we’ve identified so far on the voyage. But before we do that, we want to focus in on one particular seabird that holds a special interest for people all over the world – and that’s penguins!

During our post-Leg 1 Cape Town stopover in December, we were treated to the unique experience of visiting a large colony of African penguins that reside near the Cape of Good Hope (the southernmost tip of Africa.) While the overall distance from there to Antarctica is pretty substantial, it is still within the habitat range for penguins, for reasons that Tegan will explain in her excellent report. And I’ll be back soon with more.

– Dave

Tegan Science Notes #5 – Penguins in Africa?

When Dave and Bodacious Dream reached Cape Town and the end of Leg 1 of his circumnavigation at the beginning of the year, he took time to explore some of the many diverse natural wonders of that region.

One of his first trips was to see the penguins. Yes, you heard that right, penguins in Africa! The African penguin is only found along the west coast of South Africa and Namibia, though it is also one of the most common species kept by zoos and aquariums.

Dave’s Photo …

We usually think of penguins as only occurring in the snow and ice of Antarctica, but there are actually quite a few species that live in more temperate habitats along the coasts of South America, Australia, New Zealand and of course Africa. All species of penguins are native to the Southern Hemisphere, so you would never find penguins interacting with Northern Hemisphere species like polar bears and walruses.

The areas in which penguins are found do have something in common though: cooler water. When we look at charts of surface water temperatures around South Africa, we see that there is colder water around the western coast of South Africa and Namibia, in exactly the area that African penguins are found. This is called the Benguela Current. This current carries cold water northwards and creates an upwelling zone near the coast. The South East trade winds then push the surface waters away from the coast which draws the deep cooler water up to the surface.

Cold water carries more oxygen and nutrients in it because it’s denser than warm water. When phytoplankton undergo photosynthesis, they use up nutrients and oxygen from the surface water; unless this surface water is replenished then photosynthesis will stop due to a lack of oxygen and nutrients. This is why upwelling is so important; it continually brings new oxygen and nutrient-rich waters to the surface. High levels of plankton support rich ecosystems of small schooling fish, krill and squid that then help sustain larger predators such as whales, sharks, and sea birds.

African penguins feed on small schooling fish, particularly sardines and anchovies which are supported in huge numbers by the Benguela Current ecosystem. Sardines and anchovies are some of the most important commercial fish species and are caught in large numbers throughout the world. In South Africa, penguins compete with fishermen for these precious fish.

Unfortunately African penguins are considered to be endangered. Their population has declined by about 60% in the last 30 years, which is a very rapid rate. It is thought that a lack of food is the major cause of the decline. This lack of fish is due to both the huge numbers that fishermen remove, as well as environmental fluctuations in fish numbers and distribution.

Earthwatch scientists are active in studying the nesting colonies present on Robben Island; trying to understand their rapid decline and formulate strategies, which will increase their chance of survival. One success so far seems to be the addition of artificial nesting boxes to the colony. These birds typically nest in burrows, but many of their nesting sites have had the naturally thick layer of guano removed for use as commercial fertilizer leaving nothing for the penguins to burrow into. Penguins now seem to actually prefer the nesting boxes, which allow them to be more successful at rearing chicks than if they were in a burrow or out in the open.

It is very easy in this instance to blame fishermen for catching too many fish, which reduces what is left behind for the penguins. It is true that many fishing practices are very destructive, both to fish populations and to the marine ecosystem, but it is also important to remember that the ocean is an ever-changing eco-system. If the lowest levels of the marine food chain (plankton and small school fish) change, we see changes in the higher levels too. Climate change is driving these changes, just as we humans are driving climate change. Everybody has the ability to make a difference by way of the choices we make every day. We all can help to save the African Penguin.

To close things off, here’s a cute internet video that shows the ups and downs of being a penguin.

– Tegan

:: Tegan Mortimer is a scientist with Earthwatch Institute. For more exciting science insights, check out our BDX Explorer Guides or stop by our Citizen Science Resources page, where you can also find all of Tegan’s previous “Science Notes.” We welcome your input or participation on our BDX Learning & Discovery efforts. You can always reach us here or @ <oceanexplorer@bodaciousdreamexpeditions.com>

The Mystery at Farewell Spit

Posted on February 6, 2014 by oceanexplorer

A quick update from Dave followed below by a very interesting new science note from Tegan Mortimer on recent mass pilot whale strandings exactly where Dave will very shortly be passing.

Dave Rearick: We’re in sight of land now and heading up the west coast of New Zealand here. The cold front that we hoped would push us up to Farewell Spit at the northern tip of the South Island and down into Cook’s Strait dissipated and left us fighting through wind right on our nose. It was an unusual weather pattern that made for very rough seas with lots of pounding waves. I kept trying to work my way towards shore to grab the best angle north against the wind – but it was a slog with very little progress to show for a lot of effort. As my weather guy commented … It’s kind of like sailing up Lake Michigan in the Mackinac Race, getting to the bridge, and losing wind. You can see the finish; you just can’t get there!

41.1179S, 171.47621E

Yesterday, I began to grow concerned about having enough fuel to carry me through the notoriously unpredictable winds of Cook’s Strait. I got on the radio to see about landing somewhere along the rugged and dangerous coast, when a commercial fishing boat named “Ocean Odyssey” picked up my radio signal and offered to help. Eventually, we got our boats close enough together, that I was able to tie my gas cans to a line and drop them over the side, where they picked them up and refilled them for me.

The whole operation took us about two hours, but now I am better set for Cook’s Strait, with 50 gallons of fuel intend of 5. The skipper Barry even suggested that I come onboard the Odyssey for a shower and a hot meal … but I begged off, preferring to stay crusty with a belly full of freeze-dried filler. Today is all stormy and bouncy and so I have to stay focused. Oh well, onward we go! Looks like another great update right here from our Earthwatch scientist Tegan Mortimer – and on a very important topic, so be sure to check it out! Be back soon with more!

Tegan Science Notes #4 – Whale Strandings

At the very northwest corner of New Zealand’s South Island, Dave and Bodacious Dream will round a sandy spit which stretches 16 miles out into the ocean like a great arm creating the northern shore of Golden Bay. This is Farewell Spit and it is the longest sandspit in New Zealand. Sandspits form when currents called “longshore drifts” move and deposit sediment laterally along the coastline. In the case of Farewell Spit, currents and strong winds carry eroded sediments down from the Southern Alps, the mountain range that stretches the length of the South Island. As the spit builds, it shelters the leeward (or inward) side where additional sediment then builds up allowing mudflats to form.

At low tide over 30 square miles of mudflats are exposed at Farewell Spit which is an important feeding habitat for shore wildlife. Recently through the month of January, it was the site of a massive effort to rescue a pod of around 70 pilot whales which had beached themselves several times in a mass stranding event. Mass strandings of whales are a complex and still little understood behavior, which most unfortunately can be deadly for the whales. Why did it happen here?

What’s a pilot whale?

The pilot whales are actually two different species, there is the short-finned pilot whale and the long-finned pilot whale. The two species look almost identical and it is very difficult, especially where the two species’ ranges overlap in habitat, to tell them apart. Both varieties of pilot whales are toothed whales which usually frequent deep water habitats such as the edge of the continental shelf and along deep water canyons where they feed on fish and squid. Tagged whales have been known to dive to depths as much as 2,000 feet! They are highly social animals and live in pods of around 10-50 animals though groups can be of more than 100 animals. Pods keep in contact with each other through complex whistles and other vocalizations which are believed to be unique to individual pods. Animals will instinctively follow the calls of key animals such as mature older females which act as pod leaders or to the distress calls of young whales. This behavior makes pilots whales particularly susceptible to mass stranding.

Pilot Whales

Why do whales strand?

Around the same time that pilot whales where stranding on Farewell Spit, there was also pilot whales stranding in the Florida Everglades. Pilot whales together with other social and toothed whales like dolphins, killer whales, and sperm whales are the most common whales to become stranded. You might remember me talking about sea turtles stranding in my last Science Note when the turtles get washed on shore after becoming stunned by the cold water. Toothed whales seem to actively beach themselves, swimming into shallow water where they get stuck as the tide recedes. The tight social bonds between animals in a pod mean if just a few do this, then it’s likely that whole pods will follow suit and strand together. Why this occurs is a mystery and there is probably no single answer that fully explains the behavior.

There are a few causes which are often pointed to when whales strand. Individual animals may beach themselves if they are sick or injured. Other healthy animals may strand if they are unwilling to leave an injured pod member. This seems like it might have been the case of the pilot whales that stranded in Florida, they were not in very good condition and necropsies (animal autopsies) of the animals that died showed that they had nearly empty stomachs.

In contrast to the Florida pods, the whales that stranded on Farewell Spit were in good condition and seemed healthy, so probably they stranded from other reasons. These whales may have gotten trapped in shallow water as the tide flowed out of Golden Bay. Farewell Spit forms a long hook which can be difficult to navigate out of, which is made worse by the quick drop in sea level when the tide recedes. The soft muddy bottom doesn’t reflect the whales’ echolocation, which means that the whales can’t “see” the bottom. Essentially they don’t realize they are in shallow water until it is too late. There is also evidence that noise disturbances from seismic testing and military sonar could also be a factor in mass strandings.

Unfortunately, stranding is fatal for whales. Out of the water, whales as quickly susceptible to dehydration and overheating. Whales are designed for a weightless world, which allows them to grow very heavy. Out of the water, all this weight presses on their vital organs and can cause death in and of itself. Unless they refloat on an incoming tide there is little chance for a whale to get back to deeper waters.

Luckily there are well-developed stranding response networks in many places around the world which can hastily mobilize volunteers and experts to attempt to rescue stranded whales. New Zealand has one of the best rates of successfully rescuing stranded whales. However it is still a difficult task and many whales die naturally or have to be euthanized, and even whales which are successfully moved to deeper water will return to re-beach themselves a second time.

Here are two particularly good articles about the stranding in New Zealand.
:: http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11189886
:: http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11191661

:: Also, if you happen to know other scientists, educators or journalists who might be interested in contributing on our Learning & Discovery side, we’d love to make their acquaintance @ <oceanexplorer@bodaciousdreamexpeditions.com>

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