Craig is temporarily a post-doctoral fellow at the Monterey Bay Aquarium Research Institute who is looking for a permanent position. He spends most of his time balancing his overwhelming geekdom with normalcy so he can function in the real world. Luckily his wife likes his geekiness.
Peter Etnoyer is a Graduate Research Associate at the Harte Research Institute for Gulf of Mexico Studies, Texas A&M University-Corpus Christi. He studies deep corals and ocean fronts, and he loves to be on the water.
Kevin Zelnio is a Graduate Student Researcher at Penn State studying the ecology of hydrothermal vent and methane seep communities. He raises awareness of the plight of the spineless through folk music.
Story by Bryan Wallace, Duke University.
UW photo by Ed Standora.
Life in the deep sea is as far removed from a source of atmospheric oxygen as there is on Earth, but a select few animals do not let their need to breathe air limit the depths of their exploration. (No, I'm not referring to intrepid deep-sea human researchers.) These extraordinary critters frequently venture into the hostile conditions of the deep-sea, despite being vitally tied to air the above the ocean's surface.
When you hear about deep-diving, air-breathing animals, you might first think of colossal sperm whales plunging over 1,000 meters to battle giant squid in the dark abyss. Or perhaps you think of massive elephant seals spending over an hour at depths over a half a mile down chasing prey. Maybe you've even heard of the deepest known diver of them all, the beaked whales, with recorded dives to over 2,000 meters. But what about turtles? Could a shelled reptile be suited for making dives where only a few whales and seals dare to go?
Leatherback turtles, like some whales and seals, possess remarkable adaptations for long and deep dives, with large onboard stores of oxygen in their blood and muscle, and special features like collapsible lungs (to avoid 'the bends'), flexible shell (to respond to increased pressure at depth), and slowed heart rate (to conserve energy and oxygen stores). In fact, researchers have recorded leatherbacks diving to over 1,000 meters in different ocean basins (maximum reported dive was 1,230 m in the North Atlantic). Apparently, anything a whale can do, a turtle can, too.
To be clear, leatherbacks spend most of their time within the top 300 m of the ocean. These diving tendencies are likely due to leatherbacks' air-dependence and because they feed primarily on jellyfish, like lion's mane jellies and sea nettles, which tend to be concentrated at or near the ocean's surface. However, leatherbacks are clearly capable of - and undertake - much more ambitious diving. The obvious question is: what are leatherbacks doing down there?
At this point, we aren't sure what motivates a leatherback to plunge thousands of meters away from their most critical resource, but there are a few possibilities. Like other deep-divers, they might be pursuing prey. (Let's face it; food is a strong incentive for any animal.) Perhaps they shuttle between different water temperatures in order to keep their body temperature stable, so an occasional deep dive into frigid waters could offset the heating effects of strenuous diving. Or maybe, like many other marine animals, they use the deep-sea as refuge to evade hungry predators, such as sharks and orcas.
Currently, we are using satellite telemetry to track several leatherback turtles migrating away from their Costa Rican nesting beaches to their high-latitude foraging grounds in the Eastern Tropical Pacific. Check out www.greatturtlerace.com to follow leatherbacks on their migration and to learn more about leatherbacks, the threats they face, and what is being done to protect them. Led by Stanford researcher George Shillinger, our group is analyzing leatherback dive profiles in relation to several oceanographic features to figure out just what drives leatherback diving. So far, all leatherbacks in our study have dived well beyond 300 meters on several occasions, and many have reached depths in excess of 1,000 meters. While leatherbacks have yet to reveal all of their secrets to us, hopefully our current efforts and those of our colleagues in other parts of the world will shed light on the dark side of leatherbacks' deep-sea lives.
From left to right, pictured are Bryan Wallace (Duke University), Rotney Piedra (Director, Las Baulas National Marine Park), Carlos Diaz (Park Ranger), George Shillinger (Stanford University), and Guillermo Briseno (Park Ranger) aside one of the largest turtles in Great Turtle Race. This turtle weighs about as much as the 5 grown men sitting behind her. She laid 12 nests at Playa Grande this season before departing on her trans-Pacific migration. Photo by Jason Bradley.
Comments
Sea turtles in the Gulf of Mexico are known to eat shallow benthic organisms like sea pens and sponges. These grow in deep sea environments, too. Is there any evidence suggesting deep diving turtles eat deep sponges?
Posted by: Peter Etnoyer | April 16, 2007 4:55 PM
Great question, Peter. You're correct that neritic sea turtle species (e.g. loggerheads, green turtles, ridley turtles) are known to go after invertebrates of all sorts. However, no one knows if leatherbacks (or maybe other sea turtles on a deep dive) are going after deep sponges. It's possible, I suppose, depending on where they are. But often those really deep dives happen in REALLY deep water, where they never even approach the ocean floor.
Posted by: Bryan Wallace | April 16, 2007 6:36 PM
She's gargantuan!
The Bends explained:
http://health.howstuffworks.com/question101.htm
What makes their lungs collapsible? What makes ours incollapsible?
Posted by: Kiki | April 17, 2007 1:47 AM
My Supervisor used to do quite some leatherback tracking work here in Malaysia but because they're effective extinct these days, she now focuses her research (not tracking) on the green and hawksbill turtles (check out www.umt.edu.my/seatru).
And we're also trying to track a river terrapin (Batagur baska), a collaborative effort with Prof Herman from Acadia University, Canada.
Posted by: pelf | April 17, 2007 3:51 AM
In response to Kiki's question, collapsible lungs are made possible because of special cartilage that sea turtles and other air-breathing vertebrates have in their lungs that allow the lungs to be more flexible and collapse. Cartilage in our lungs is more rigid, hence no collapsing, at least not in beneficial ways. When a leatherback's lungs collapse under pressure, the air in the lungs moves up into the trachea, which IS rigidly enforced by hard cartilage, but because no oxygen or CO2 is transferred across the walls of the trachea (like what happens in the lungs), the air just stays there until the animal ascends and the lungs reinflate.
In response to 'pelf''s comment, it is a shame about the Malaysian leatherbacks, and having learned that lesson, we are trying to make sure the same doesn't happen to the leatherbacks in the Eastern Pacific. Check out www.greatturtlerace.com for more info on our efforts.
Posted by: Bryan Wallace | April 17, 2007 4:47 AM
Have you been able to identify or at least estimate the maximum dive depth for leatherbacks? If not, could you give us a hypothesis instead?
Also, what is the average distance an individual you are tracking travels per day?
Posted by: Heather | April 17, 2007 3:42 PM
Keep posted tomorrow for more information about the leatherbacks!
Posted by: Kevin Zelnio | April 17, 2007 5:21 PM
In response to Heather's questions, the deepest dive recorded for a leatherback is 1,230 m, recorded by Professor Graeme Hays of the University of Swansea, Wales, and his colleagues. As far as we know, leatherbacks can travel around 40-70 km/day (30-50 miles/day). The distances on the Great Turtle Race website are 'retro-fitted' to accomodate the 2 week lifespan of the site itself.
Posted by: Bryan Wallace | April 17, 2007 6:41 PM
Bryan, I've been to the site (www.greatturtlerace.com) and I just LOVE the cute turtles :)
I'll definitely blog about it as part of the awareness I'm spreading at my blog. In a while :)
Posted by: pelf | April 19, 2007 3:17 AM
I'm glad you like the GTR site! Be sure to check out all the info on the site, including the education-related materials! And thanks for spreading awareness -that's the goal!
Posted by: Bryan Wallace | April 19, 2007 4:35 AM
My son todd loves turtles they are his fav animal in the world he would like to know how big is this turtle u have displayed @ how old do u think she is
thnku for yr time
Posted by: Liza | September 19, 2007 10:20 PM
Thanks for your question, Liza and Todd. That turtle is about 150 cm long (> 5.5 ft), and we measure the curve of the top part of her shell (the carapace). She probably weighs about 250-300kg (600 lbs). As for her age, that's one of the most important questions, but we have basically no idea! We wish they carried their driver's license with them so we could find out! But seriously, size is not an indicator of age in these animals, and there are no other external traits that would indicate age. There are methods using bones to count rings that are formed over time (like counting tree rings), and those methods are not very consistent, and are giving us estimates of anywhere between 10-30 years to reach adulthood! So we like to say that any leatherback who is nesting is somewhere bewteen 10 and 1000 years old! That's only kind of a joke...;)
Posted by: Bryan Wallace | September 20, 2007 3:18 PM
HOW MUCH COULD THE LEATHER BACK TURTLE WEIGH UP TO.
Posted by: VICTORIA | November 12, 2007 2:46 PM
Hi:
I'm a costarican biologist, getting my graduate degree in Louisiana. I love the picture of the leatherback in the beach! I worked with Rotney and his wife Elizabeth Velez, for six seasons at Langosta National Park and leatherback conservation is my life and passion. GREAT PAGE!!!
Posted by: Diana Solis | November 15, 2007 3:30 PM
coooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooollllllllllllllllllllllll
Posted by: Tyler Clinesmith | November 29, 2007 10:54 AM
what is the matter with you guys cant you see that your hurting the poor animal i hope you honestly get hurt like she did one day!!
inconsiderate disguisting men!
i despise you and your stpidity!
Posted by: Kat | November 30, 2007 1:02 PM
hey guys i dont think that is right for you to take that turtle away from its home. i think you should put it back or put it in a new home for it and everybody can see it.
Posted by: Baylee | December 27, 2007 10:44 AM
hello fellows, i love turtles but i dont like that one because it is ugly!
bi
Posted by: Savannah | December 27, 2007 10:51 AM
this is a super cool turtle.
Posted by: addie | January 12, 2008 10:34 AM
and it is so big i wonder if they took off it back and what that grey thing. it really looks funny.
Posted by: addie | January 12, 2008 10:36 AM
aaaaawwwweeeessssooomnmeee aaaaaaaaaaaaaaaaaaaawwwwwwwwwwweeeeeeeessssssssssssoooooooooome.
Posted by: addie | January 12, 2008 10:38 AM
wooowww!!!i hope they put it back.if they didn't........curse u men!!!!
ok,that's about it.:D
BYE!!
Posted by: Jessi | January 26, 2008 1:31 PM
omfg
Posted by: Allie | February 11, 2008 2:43 PM
omg that thing cannot be reallll!!!
Posted by: ali | February 14, 2008 2:32 PM
Just one little question, but what are yall going to do with the leatherback sea turtle? Are yall going to let it go or keep it? I think that yall should let it go, because if you keep it than it might die,but if you let it go than it will probably live.
Posted by: Jordan Anderson | February 21, 2008 2:19 PM
that shit is crazzyyy biggg :D
Posted by: Toria | March 19, 2008 10:55 AM
I love turtles!
Posted by: wynetta lynnda | March 19, 2008 10:57 AM
Jordan, the leatherback sea turtle above was tagged with a satellite transmitter and released back into the ocean.
Posted by: Peter | March 19, 2008 11:47 AM
i love turtles! they are so cute! it was amazing what you caught! keep saving the turtles!
Posted by: stef | March 25, 2008 12:28 PM
I love turtles. I have on and i hope everyone can make a difference to the turtles!Alot of turtles need your help!
Posted by: Alexa | March 30, 2008 5:25 PM
I love turtles. I have one and i hope everyone can make a difference to the turtles!Alot of turtles need your help! You guys did a great job but if i were you i would let it go to the wild thankyou for the suport!
Posted by: Alexa | March 30, 2008 5:30 PM
Awesome leatherback! I love turtles too - used to babysit a red-eared pondslider who was as old as I was (21-26 yrs back then). We also help the loggerheads and green sea turtles here.
So, since this post was from a year ago, what's happened to her?
Posted by: Melusine | March 31, 2008 9:32 AM
Hi again everyone. It's been a while since I responded to the comments to my article, and I'm thrilled to see all of the attention it has received! Thanks to everyone who has posted a comment, linked to the article, and shown interest in the story.
To address the main questions about what happened to the enormous turtle in the photo, where is she now, etc., I'm putting together a new post. Stay tuned!
bw
Posted by: Bryan Wallace | April 2, 2008 8:43 AM
Bryan's follow-up to this leatherback turtle story is posted here
Posted by: Peter | April 10, 2008 1:52 PM
Are you still letting the turtles go?
Posted by: Jordan Anderson | April 16, 2008 1:26 PM
Jordan,
Yes, of course they let the turtles go. Read the update posted in comment #34.
Posted by: Peter | April 16, 2008 2:24 PM
SEA TURTLES ARE THE BEST! THEY'RE MY FAVORITE ANIMAL!
Posted by: Bo Gribbon, age 6 | April 16, 2008 3:47 PM
I think that u should keep saving the turtles!!!!turtels Are one of my fave animals I LUV THEM!!! :) By the way #30 is right!!!!!!!!!!!!!!SAVE THE TURTLES!!!!!They need our help!!!!
Posted by: alma | April 16, 2008 5:06 PM
nice sea turtle i have one but not that big in fact i got two...
Posted by: monique | April 19, 2008 5:58 AM
oooh he/she is so so so so so so so cute
Posted by: jordan | April 20, 2008 9:19 AM
what the heck is wrong gith that fricken turtle and by the way i'm dumping you
Posted by: hi | April 22, 2008 3:44 PM
Wow, that is amazing. I have never seen a turtle that huge. I think they are the most fascinating animals alive. we need to stand and preserve the for the future for many more to see.
Posted by: Cine Cruz | April 28, 2008 2:41 PM
I feel they are one of the most facinating animals alive. I am in love with them.
Posted by: Cine Cruz | April 28, 2008 2:45 PM
Hello Turtle Lovers, I have just returned from Parismina, Costa Rica after volunteering with the local effort to save the leatherbacks. The island of Parismina is a beautiful place on the Carribean side of Costa Rica. My daughter Carin and I went there for a week as volunteers. we walked the beach at night looking for the turtles that have come ashore to lay their eggs. We participated in measuring, tagging, egg gathering, and some beach clean-up programs. It was an amazing experience that I will never forget. We stayed with a local family who fed us daily, invited us into their home and made us most comfortable while we were there. Poaching has decreased since the program started and the islanders show a respect for the turtles and the influx of funds that comes along with Ecotourism and awareness of the amazing resource that is the turtle population. Parismina is remote and wildlife of all kinds is abundant. Check it out! Sincerely, Dale
Posted by: Dale Hoffman | May 3, 2008 8:29 AM
hi I love leatherback turtles! one question how did they get their name?
Posted by: alcat | May 4, 2008 1:31 PM
That was horrible i mean who would hunt a turtle like that big it sucks THERE IS PROBABLY NOT THAT MANY OF THOSE ANIMALS LEFT.So please consider saving that turtle unless its already dead :-{...SAVE EVERY ANIMAL THATS ENDANGERED...THEY NEED OUR HELP!!!!!
Posted by: aNG | May 5, 2008 3:56 PM
Alcat,
The turtles got their name from their supporters in the Great Turtle Race http://www.greatturtlerace.com/.
aNG,
We're with you. No turtles were harmed in this experiment.
Posted by: Peter | May 5, 2008 7:06 PM
omg me and me friend r doing reaserch on turtles 4 our science project an i love thi info.......
is there any other info on leatherback turles we could use..(mabe on classification)...????????
coolio
i
Posted by: cassidy | May 6, 2008 7:34 PM
Try this post Cassidy.
http://scienceblogs.com/deepseanews/2007/04/from_the_desk_of_zelnio_dermoc.php
Posted by: kevin z | May 7, 2008 2:02 PM
That is a really big turtle. How would you find something like that?
Posted by: loran | May 14, 2008 7:54 PM
you idiots i cant believe you would ever do such a thing i for one am a major turtle lover you wouldn't believe how much i love turtles. And for you to do that tou guys a pure evil!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Sham Sham on you. God despises you why would you ever hurt an animal!!!!!!!!!!!!!
If I knew where you were and if I had a car i would go hurt you as much a you hurt the poor turtle they never did anything to you so why should you punish them for being the largest turtle or the smallest turtle in the world it not their fault!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I♥Turtles but I HATE YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Katie
Posted by: Katie | May 16, 2008 10:00 AM
wow thats the biggest turtle ever !!!!!!!!!!!!!!
Posted by: sydnie<333333 | May 20, 2008 12:22 PM
Hi All:
It's great to see that people are still posting comments to this story! Thanks for your interest! As a reminder, I've posted a follow-up story to this one (check out post #34 for the link).
I want to address some of the comments that have voiced concern over whether we are hurting the turtles. To be very clear, we love the turtles more than anyone else on Earth does. We have dedicated our lives and our professional careers to is SAVING turtles. So, while the photo above might look like we're doing something to hurt the turtle, that 'backpack' is carrying a tracking device that has allowed us to follow her (and many of her fellow turtles) as they migrate across the eastern Pacific Ocean (Check out my other post to see where this turtle went!). This information is absolutely critical to finding out where they go, when, why, and what we need to do to make sure they can do so safely.
Simply put, my goal here is to bring the beauty of leatherbacks and the importance of marine conservation to as many people as possible. I'm thrilled to see so many people so interested! You can find out more about what we and others are doing to save sea turtles at www.conservation.org/seaturtles, www.seaturtle.org, www.leatherback.org, www.topp.org.
Thanks again for your interest, and feel free to ask questions,
Bryan Wallace
Posted by: Bryan Wallace | May 20, 2008 12:29 PM
You mean... you're NOT pur evil?
Posted by: Peter | May 20, 2008 12:46 PM
LOL...nope. Only the light side of the force for us young turtle jedis.
Posted by: Bryan Wallace | May 20, 2008 1:43 PM
I LOVE TURTLES!!!!! if you saved it im so happy! when i grow up i want to be a marine biologist when i grow up!
Posted by: Courtney Merryman | May 27, 2008 8:10 PM
Brian Wallace - you are so patient and understanding of the harsh comments that are obviously made by young and uninformed individuals that did not bother to read the article. Thank you all for your dedication to educating the world and saving the letherback. We use your turtle race web site in our third grade class here in maumee ohio to teach students about the need for conservation and awareness.
Posted by: Susan | June 12, 2008 3:29 PM
Thats a big ass turtle
Posted by: mia | June 14, 2008 6:56 AM
How far north do these things come? As a Commercial Fisherman in Alaska I've seen a whole lot of strange things come up from the top all the way to the bottom. Even pulled up the head off of a Model A Ford once (probably used as an anchor once), but been splattered many, many times with small jellyfish. I'd love to see some turtles up here that would eat the darn things!
Posted by: borealfox | June 15, 2008 7:40 PM
To Susan: That's great to hear that info and enthusiasm about the turtles has made it all the way to Maumee, OH! I was born and raised in Ohio myself, so I love to hear that the word is out in the 'heart of it all'!!!
To Mia: yes it is.
To 'borealfox': I would love to hear more about the 'strange things' you've seen in your work. I'm sure the Model A Ford is only the beginning! While it wouldn't be impossible for leatherbacks to get all the way up to Alaska, it isn't very common. I think there have been very sporadic sightings over the years that far north, but leatherbacks are typically limited to the Pacific NW USA and BC, Canada. But rest assured that you aren't the only one who would love to see more leatherbacks and fewer jellyfish!
Posted by: Bryan Wallace | June 16, 2008 4:02 PM
Oh yeah, and to Courtney Merriman: It's the best job around! Go for it!!!
Posted by: Bryan Wallace | June 16, 2008 4:03 PM
Hi turtle lovers,
I've recently joined a sea turtle watch program in Walton County, FL,and this Thursday I'm giving a presentation to my Kiwanis Club all about the turtles. If you have any advice or facts you'd like me to impart to the Kiwanians, I'd be happy to do so!
Best,
Mary Brady
Sea Turtle nest and hatching grounds protector
Fort Walton County FL
Posted by: Mary Brady | July 21, 2008 1:11 PM
THAT IS THE BIGGEST TURTLE I HAVE EVER SEEN !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Posted by: Susie Joy | July 30, 2008 12:45 PM
OMG THAT IS THE BIGGEST TURTLE I HAVE EVER SEEN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Posted by: Ashley Martell | July 30, 2008 12:52 PM
THAT IS THE BIGGEST TURTLE I HAVE EVER SEEN IN MY WHOLE LIFE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Posted by: Shelby Martell | July 30, 2008 12:57 PM
this is the biggest turtle i have ever seen i soooooo want to have a pet turtle like that!:~)
Posted by: Savannah Bushman | July 31, 2008 12:35 PM
Playa Grande neighbors go to court for damage to leatherback turtles
On July 1, an appeal for protection was filed before the Constitutional Court by the Playa Grande Neighbors Association, arguing serious damage is being caused to the leatherback turtles that come to nest on the Guanacaste beaches of Playa Grande and Playa Ventanas.
Julio Saenz, a member of the community group, said he was going “to present proof that scientific research led by the organization The Leatherback Trust (President Jim Spotila), has made it so that these endangered turtles are not coming back to nest on these beaches, which are part of the Las Baulas Marine National Park.”
The experiment being questioned was conducted for scientific reasons. However, the Playa Grande Neighbors Association has indicated that none of the turtles fitted with the radio transmitters returned to their nesting site. That’s the main reason for the appeal for protection (recurso de amparo) that they filed with the Constitutional Court, and which is now being reviewed by its magistrates.
Of the 27 turtles that were outfitted with the devices in the 2003-2004 season, none returned to their nesting site, despite the fact that leatherbacks return to their nests, on average, 3.7 years after the time they migrated.
This information was presented in the reports issued by researchers with The Leatherback Trust, and which the Playa Grande neighbors have copies of. Meanwhile, 40 other turtles that were not given a transmitter, also on the 2003-2004 season, did return to their nests the following season.
In this sense, the appeal for protection accuses The Leatherback Trust of violating a series of international agreements ratified by Costa Rica for the protection of flora and fauna, according to article 7 of the country’s Constitution. The complainants are asking the Constitutional Court to ban experiments done with the turtles, as they could generate “an irreversible effect against the environment, according to the appeal presented against SINAC, the Tempisque Conservation Area, and the Ministry of the Environment and Energy (MINAE).
Posted by: Pedro Vargas | July 31, 2008 3:20 PM
biiiiiiiiiiiig turtle, asome
Posted by: melissa | August 1, 2008 7:08 PM
In response to Pedro Vargas:
First, our project has a 20 year history of research efforts that have contributed to conservation of leatherbacks in Costa Rica, including the formation of the National Park, and the ELIMINATION of egg poaching, which was one of the main drivers in the population decline of these animals. Thus, our reputation for important, reliable scientific research and consistent, dedicated conservation efforts speaks for itself -in Costa Rica and around the world.
Second, as conservation scientists working with endangered species, we have a responsibility to maximize the conservation applications of our research while minimizing the impacts of that research on our study animals. The very nature of field research is such that it is impossible NOT to have some impact -however small- on one's study subjects. Despite this unavoidable fact, we used the most widely accepted, proven technique available to us at the time of the study to attach transmitters to leatherbacks (the harness) to study their movements and the environmental influences of those movements throughout the Pacific Ocean. No tracking study had ever been conducted on this population on the scale of this one, and no tracking study had ever obtained so much crucial information to be used for conservation of leatherbacks in Costa Rican waters, and international waters as well.
Third, speaking of conservation importance, through high-level analyses of these high-quality data, we were able to outline clear, pertinent recommendations for conservation of leatherbacks in their marine habitats. In addition to egg poaching, incidental capture of leatherbacks in fishing gear also has been implicated as a major driver of this population's decline. Thus, mitigating the interactions between leatherbacks and fishing gear is now the most important conservation issue facing us and the leatherbacks we are trying to save from extinction. The information we obtained in this study has allowed us, for the first time, to describe in great detail where leatherbacks go, why they go there, when they go there, and what can be done to keep them out of fishing gear.
Fourth, as a technical point, contrary to the claim in his post, there are currently no data clearly demonstrating adverse impacts of the harnesses on leatherbacks. The only studies that have explored this possibility have arrived at tentative, suggestive conclusions that harnesses might result in slightly slower travel rates or might be related to earlier start of migration. What is needed is a rigorous test of various techniques to figure out what the impacts actually might be.
Fifth, we have identified almost 2000 individual leatherbacks over the past 15 years of monitoring, but have seen fewer than 500 return to the beach after being counted for the first time. Thus, we have an unfortunately, but consistently, low rate of return of our turtles (about 25%). In fact, during the years that we put harnesses on turtles, we counted 417 individual turtles, of which only 18% have returned so far. The turtles that we put harnesses on (46 total) are in the proportion that haven't returned yet, but still might. Leatherbacks take between 2 and 7 years to return to the beach to nest, and in some cases, we've recorded turtles returning after intervals of more than 10 years! Everyone can rest assured that when these turtles come back, our patient field biologists will be waiting to count them.
The take-home message is this: we care about saving these turtles more than almost anyone, and we always try to do the best job we can to find out what we need to know to save them, and to take the actions necessary to save them. We hope that others will join us in saving the leatherbacks in the Eastern Pacific!
Thanks for reading,
bw
Posted by: Bryan Wallace | August 8, 2008 2:45 PM
i think turtles are the most awesome animals i have two myself but believe me they're much much much smaller than this one i wish i could do all the hard work you guys did for that turtle i would risk my life to save a turtles and i am not kidding i love turtles so much i could spend a whole hour talking or typing about turtles there incredible animals in my point of view they;re better then dogs and any other animals when i hope to grow up to be just like those guys but only a girl well thanks for what you guys did thats what everyone should do pitch in just a little but what you guys do i a big step into helping the earth but i dont think theres enough people in the world that will actually help all they want to do is build and make bunches of money you can do that but you can do that by helping the environment and you can make just as much money but i like to do it for fun or for free well i better wrap this up thanks for all that you did thanks very very very very very very much bye bye now 8)
Posted by: Danielle | August 15, 2008 10:09 PM
Thanks for your great comment, Danielle! Nice words of support go a long way for us folks working hard to save these animals and their habitats. And just through your enthusiasm and personal choices, you are already part of the team, helping the conservation efforts! Keep it up!
Posted by: Bryan Wallace | August 19, 2008 6:43 AM
During a recent off shore fishing trip (August 21, 2008) I hooked into an extremely enormous sea turtle of approximately nine feet long, with a head the size of a cow. I had no idea that a sea turtle could be that large, and that far north. We were 30 miles south of Block Island, RI. I just wanted to know how large the largest known leatherback turtle is, and what you think he was doing this far north. Love the research you are doing, keep the info rolling.
Peter
PS. The turtle was released unharmed
Posted by: Peter H. | August 23, 2008 7:13 AM
Peter H, do you have a photo you can share? Send it along.
Posted by: Peter Etnoyer | August 23, 2008 7:36 AM
No, unfortunately there is no photo
Posted by: Peter H. | August 23, 2008 10:39 AM
Hey Peter H.:
That would be a leatherback! The largest on record was found on the coast of Wales, entangled in a net. It was a male leatherback that measured 2.8 m (almost 10 feet) long and weighed more than 900 kg (2100 lbs.). There really haven't been any records close that monster. The biggest records we hear of in the Atlantic and Caribbean are not quite 2m (7ft) long over the shell and probably weigh 700-800 kg (>1500 lbs). Not small, that's for sure!
The farthest north that a leatherback has been confirmed is up off of Norway, at appx 72 degrees North latitude! There are also reports of them in Alaska and swimming around ice floes in northern Canada. In fact, there is a great research crew based in Nova Scotia who work with local fishermen every summer studying leatherbacks in the ocean on the Scotian shelf. Leatherbacks are off New England, Nova Scotia, Newfoundland every summer around the same time (August-September). Look up the Canadian Sea Turtle Network for more info.
So how did you guys get it unhooked? What were you fishing? Nice work releasing it unharmed, and thanks for sharing. Keep that camera handy next time, just in case!
And thanks for your interest in our research. It sure isn't a bad job!
Posted by: Bryan Wallace | August 24, 2008 4:36 PM
hi nice turtles
Posted by: miriah | September 6, 2008 8:23 AM
l love turtles
Posted by: chelsey | September 23, 2008 3:24 PM
If you ask me the tag looks rather massive! I am not sure how they would get accurate readings from the turtle after this massive obtrusive tracking device will obviously hinder and make the creature very uncomfortable.
Cruelty in the name of conservation- how would you feel with a device proportianate to the scale of that one fitted around you????????/
Posted by: Lisa | September 29, 2008 3:42 AM
yall save the turtles make a differece theres more animals in need than humans oil leaks that go in the ocean can kill them SAVE THE SEA ANIMAL INCLUDING TURTLES!!! make a differece im asking a favor!! save the sea animals if u dont they will go extint no more dolphins!
Posted by: miley | October 6, 2008 2:08 PM
re: Lisa's post.
Thanks for your concern and observation. The reality is that the satellite tag plus the equipment used to attach it weighs
In addition, the unique, smooth, oily skin of leatherbacks does not allow for direct attachment to their shells using glue, epoxy, etc., as is done for other species of sea turtles. The fact of the matter is that the attachment method shown in the picture was the most widely used, and widely accepted method available at the time that we deployed these tags.
As I've mentioned before, in order to gather the most important information that we need to be effective in conservation of these animals, we have to be proactive. For leatherbacks, understanding what they do in the water, where threats from fisheries bycatch and other pressures occur, is absolutely essential. We would not know what we know now about their movements, behaviors, and habitat requirements without having attached those tags.
No one values the survival of leatherbacks more than we do. That's why we do whatever we can, as conservation scientists, to provide the best scientific information possible to the people who make important decisions that affect whether leatherbacks will be around for the next generations to appreciate and conserve.
We appreciate everyone's support of our work, but more importantly of actions that will help leatherbacks and the seas they live in.
Bryan
Posted by: Bryan Wallace | October 10, 2008 8:27 AM
OMG! Why did you do that!?!? You are a I.D.I.O.T IDIOT!!!!! I love turtles in fact i am getting one today from the Pet Depot. STIL!!!!!!!!!!!!!!! I wish i could sew you!!! Just because i am a girl doesnt mean that i dont help turtles!! They are endangerd!! HELP THE SEA TURTLES!!!! no dont help them... SAVE THEM!!!!!!!!!!!!!!!
Posted by: Conor | October 18, 2008 9:07 AM
i was actually surprised to see 2 of these huge turtles this august off the coast of center Moriches,NY about 7 miles off actually we tok our 28'ft parker out to go look for trigger fish and tuna ;) they were beautiful but i was wondering why they were so far east and why they were swimming at the top of the water ; we also saw a pilot whale a GIGANTIC mako! and 2 green sea turtles it was a beautifullll dayyy hope to see them again next yearr
Posted by: april | November 5, 2008 10:48 AM
it is so the huge i mean how could a turtle be so huge lol
Posted by: zahra | November 18, 2008 1:26 AM
love this page... really love the voices of the young... very funny... never saw that side of research... who knew...?
about the harness... it looks like an aluminum tube frame... and... it just looks sorta permanite. isn't there some way to attach a transmitter that would detach in a few months...? the batterys in the transmitter only last so long... maby something that sheds after a few months in the ocean like rope made into a harness... or super glue it to a bit of the shell... you folks have probably thought this over but i had to ask... love the turtles...
Posted by: john in portland oregon | December 1, 2008 2:19 AM
Hi John:
Great questions about the harness attachment. The tubes are flexible tygon plastic, and nylon straps pass through them and around the midsection of the body. Everything is held together by a rubber ring w/ a corrosible link. Thus, the whole apparatus will fall off automatically within a year or two, we estimate. The transmitters' batteries are programmed to last roughly 2 yr, so this timing is just right.
No type of glue or affixing substances can be used on leatherbacks because of their unique oily, leathery skin. Several folks are now trying to directly attach transmitters to leatherbacks' shells, but those procedures are still being developed.
The bottom line is that we are always trying to maximize the info we can get from tagging turtles while minimizing the impacts on the turtles due to the tagging itself. I'm sure we'll never be satisfied, and I think that means we are doing our jobs right.
You're right, the comments to the article have been great -for the most part. I'm always excited to have young folks get interested.
Thanks for your interest!
Posted by: Bryan Wallace | December 6, 2008 9:36 AM
OMG I love turtles! That is giant! Can u get me one! lol
Posted by: Emma | December 9, 2008 2:50 PM
Does anyone know how old this turtle is?
Posted by: Cassy | December 29, 2008 8:44 AM
is that turtle dead
Posted by: Sean Myers | January 5, 2009 12:04 PM
this is sooooooooo coooooooooooooooooooollllllllllllllllll
Posted by: alli | January 8, 2009 6:28 PM
holy crap!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! i wonder how it would feel geting bit by that thing?
Posted by: conor | January 16, 2009 2:21 PM
ive heard of large snapping turtles, even large sea turtles, but i never imagine that they get that big, shes beautiful!!!!!! id love to see her up close and personal.
Posted by: sarah | January 26, 2009 12:53 PM
could this turtle eat something alive or what!
Posted by: ???????? | February 1, 2009 10:18 AM
the leatherback turtle is the best!!i did a report on it and i got a 100.
Posted by: Jade | February 10, 2009 4:14 PM
I can't believe the picture i just saw of that turtle .I've never seen a turtle that big.It's amazing that they can get that big.
Posted by: Sam | March 9, 2009 3:02 PM
really is she dead? she sure looks it. oh and how old is she? I really love turtles and i know shes Old but she looks horrible. I have 4 Red eared sliders and i love them. They are in a 75 gallon tank and they are happy. their not that big.Two of them are about the size of a tuna can, and they are 2 years.Then the other two are about the size of a coffee can, and their 4 years old. Their colors are really starting to show. My favorite turtle is a sea turtle. Their so beautiful.
Posted by: sam | March 9, 2009 3:15 PM
wow sad
Posted by: joseph | March 11, 2009 8:36 AM
Hi All:
I assure you, the turtle in the photo is NOT dead. She was very alive as she threw sand all over the beach while covering her nest, and walked powerfully back to the ocean, before paddling across the Pacific (see my other post to see where this turtle went: http://scienceblogs.com/deepseanews/2008/04/leatherback_turtles_one_year_l.php#more).
Unfortunately, we don't have a good idea as to how old this turtle is. To become adults, a leatherback probably takes at least 15 yr, maybe more. So, let's say that this turtle is at least 15, and might live another 30 or more years (again, an estimate).
Other sea turtle species can take more than 30 yr just to become adults!
Thanks for all of your interest!
Bryan
Posted by: Bryan Wallace | March 18, 2009 6:11 PM
Hi, wow i've never seen a turtle that big before. my question is are all turtles related in one way or another? they all look similar, even land turtles look a little like a sea turtle, except they have legs not fins.
So, are all turtle's, land and sea related?
thanks for helping out one of the most beautiful creatures on earth!!!
Peace, Sarah Walker
Posted by: Sarah Walker | March 22, 2009 8:53 AM
damn,that things big
Posted by: cloe | April 13, 2009 4:54 PM
question..in post 85, you say the tracker comes off after about 2 years or there abouts..in post 69, you say sometimes the turtles don't even return to the beach for 2-10 years..do you follow these same turtles all the time? do you have to go replace the batteries before they die, so you could keep following those same turtles? or do you just find another turtle to follow?..
Posted by: Sarah | April 13, 2009 8:09 PM
the first time i saw this i was like omg,
that's huge, but then my friend ashly
told me that you guys had to hurt it
to get it caught. i dispise hurting animals
too, but hey, this is a pretty kick butt picture
(:
Posted by: Brooke | May 21, 2009 7:11 AM
did that turtle live??
i love turtles
Posted by: kacey | May 24, 2009 5:06 AM
My mom would love this pic she is a big turtle and dragon fanatic her room is decoraten in mid evil stuff and she collects turtle stuff. She'll freak when I show her this pic.
Posted by: Kayla Anderson | July 6, 2009 7:12 PM
Is there any possibility the leatherbacks you have outfitted with these devices are diving to such depths in order to free themselves of the device?
Posted by: Stacey | August 1, 2009 9:38 AM
nooo! put it back in the sea where it belongs i feel so sad now! dont bring it out are they crazy!
Posted by: kujo kaiik | August 29, 2009 11:08 AM
PEOPLE: read the article BEFORE commenting.
I care a great deal about the well being of animals and nature. I have to admit the picture does look concerning at first. I pray that these animals are truly getting the help they need and deserve. There is sometimes a fine line between helping and meddling, wouldn't you say?
I have enjoyed reading all, or I should say most of the comments (yes i have read them all). Thanks, most fascinating.
I love turtles, and they are often in my dreams. :)
Posted by: Brenna | September 6, 2009 8:07 PM
LoL
Posted by: tya | September 14, 2009 5:07 PM
I THINK THATS AWESOME YET CRUEL BECAUSE ANIMALS ARE NOT TO BE PLACED TRACKTER ON THEIR NECKS IT MAY HURT THEM JUST CLIP A TRACKTER ON ITS FIN OR MICROCHIP
Posted by: georgia | September 18, 2009 11:16 PM
I like Turtles.
Posted by: Zac Efron | September 24, 2009 1:44 PM
PLEASE SAVE THE LEATHERBACK SEA TURTLE ! DON'T THROW THINGS SUCH AS BALLOON , PASTIC BECAUSE THE LEATHERBACK MAY THINK IT IS JELLY FISH !DON'T CATCH THE BABY LEATHERBACK BUT HELP THEM TO REACH TO THE SEA !
Posted by: angel | October 8, 2009 5:07 AM
Okay first of all leave those turtles alone!! Turtles
are my FAVORITE animals and I have a turtle and I dont care what you say but you are hurting that turtle he was fine without YOU ruining his life do you want a shark to rip off your skin and cover you in radios DIDNT THINK SO. Because now you just ruined his protection and he wont live THAT LONG So now think about this
TURTLE KILLERS
Posted by: TURTLE LUVER | October 21, 2009 12:26 PM
WOW THIS IS CRAZY WOW ALL I CAN SAY IS WOW IV NEVER SEEN A TURTLE THIS BIG GTG HALLA AT ME CUZ
Posted by: NICOLE | October 27, 2009 3:27 PM
wouh..........wonderful
Posted by: reylvmey scale | November 8, 2009 4:21 AM