Now, a team of researchers has satellite-tracked 135 leatherbacks with transmitters to determine the turtles’ patterns of movement in the Pacific Ocean. Combined with fisheries data, the researchers entered the information into a computer model to predict bycatch hotspots in the Pacific.
With this information, researchers and authorities hope to work with fisheries managers to avoid fishing when and where there is higher risk of also catching turtles in the area.
Though the ocean is vast and the turtles’ movements are dynamic and unpredictable, the small chance of an individual leatherback getting hooked or caught in fishing lines is multiplied by 760 million in the Pacific Ocean alone, said Stephen Morreale, referring to the number of longline hooks set annually in the Pacific.
Morreale is a Cornell University senior research associate and adjunct associate professor in the Department of Natural Resources. He is a co-author of the study published online Jan. 7 in the Proceedings of Royal Society B.
“It’s a waste,” Morreale said. “This is not a case of people merely trying to feed their families. The fishing industry does not want to catch leatherbacks, and the turtles that are caught are just discarded.”
In the Pacific, the researchers identified two genetically distinct populations, one western Pacific population that nests in Indonesia and feeds off the California coast, and another eastern Pacific population that nests in Costa Rica and Mexico and migrates along a corridor past the Galapagos Islands to a broad pelagic zone known as the South Pacific Gyre.
The maps reveal seasonal and geographic areas of greatest risk. For the western Pacific nesting populations, areas of highest risk included water around the Indonesian Islands near primary nesting beaches, and for the eastern Pacific populations, areas of greatest risk were in the South Pacific Gyre.
Leatherbacks are the largest sea turtles and the most massive reptile, reaching maximum weights of close to 2,000 pounds. The leathery-shelled turtles, which feed on jellyfish, use their flippers like wings to swim vast distances at surprising speeds; they also dive to depths of 1,200 meters, shuttling to and from the surface to breathe.
Once they hatch, males spend their entire lifetimes in the water. They take up to 20 years to reach maturity. As adults, females return throughout their lifetimes to the same nesting beach to lay clutches of 80 to 100 eggs in the sand, which they may repeat every two weeks over the course of a nesting season. Once they have laid all their eggs, they may not return for three to five years.
Because of the many risks over decades that leatherbacks face before they reach maturity, “an adult’s [ecological] value is huge,” said Morreale. Also, since so little has been known about their movements once they enter the ocean, conservationists have historically focused on protecting beach areas where they can be monitored and protected.
But “their protection at sea is extremely important,” and only recently, through satellite transmitters, are researchers beginning to understand the turtles’ complex habits in the ocean, which will hopefully lead to better protection, said Morreale.
Next steps for this research include acquiring more Pacificwide data for interactions between fisheries and turtles, as well as data for the Atlantic Ocean, Morreale added.
John Roe, an assistant professor at the University of North Carolina, Pembroke, was the paper’s lead author, along with Morreale and Frank Paladino at Indiana University-Purdue University at Fort Wayne, while Drexel University professor James Spotila assembled the research team.
Funding was provided mainly by the Lenfest Oceans Program.
Cornell University has television, ISDN and dedicated Skype/Google+ Hangout studios available for media interviews.
Joe Schwartz | Newswise
International network connects experimental research in European waters
21.03.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
World Water Day 2017: It doesn’t Always Have to Be Drinking Water – Using Wastewater as a Resource
17.03.2017 | ISOE - Institut für sozial-ökologische Forschung
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy