Jeanette Wyneken, Ph.D., associate professor of biological science at Florida Atlantic University, and Kate Mansfield, Ph.D., a co-investigator at the University of Central Florida, are the first to successfully track neonate sea turtles in the Atlantic Ocean waters during what had previously been called their “lost years.” Findings from the study appear today in the journal Proceeding of the Royal Society B.
The “lost years” refer to the time after turtles hatch and head out to sea until they are seen again upon returning to near-shore waters as large juveniles. The time at sea is often called the “lost years” because not much has been known about where the young turtles go and how they interact with their oceanic environment, until now.
With small, non-invasive, solar-powered satellite transmitters attached to the turtles’ shells, Wyneken and the team were able to track 17 neonate loggerhead sea turtles for periods ranging from 27 to 220 days and for distances ranging from 124 miles to 2,672 miles.
“Prior to tagging these threatened sea turtles, all we knew about this part of their life’s journey came from one turtle that had been followed for three days,” Wyneken said. “From the time they leave our shores, we don’t hear anything about them until they are found near the Canary Islands. Those waters are a bit like nursery school for them, as they stay for about four to eight years. There’s a whole lot that happens crossing the Atlantic that we knew nothing about.”
Along with Wyneken and Mansfield, Warren P. Porter, Ph.D., from the University of Wisconsin Madison, and Jiangang Luo, from the University of Miami, found that some of their results challenge previously held beliefs.
While the turtles remain in oceanic waters off the Continental Shelf, the study found that little loggerhead turtles sought the surface of the water as predicted. But they do not necessarily remain within the major currents associated with the North Atlantic Subtropical Gyre. It was historically thought that loggerhead turtles hatching from Florida’s east coast complete a long, developmental migration in a large circle around the Atlantic entrained in these currents. But the team’s data suggest that turtles may drop out of these currents into the middle of the Atlantic or the Sargasso Sea.
The team also found that the turtles mostly stayed at the sea surface, where they were exposed to the sun’s energy, and the turtles’ shells registered more heat than anticipated (as recorded by sensors in the satellite tags), leading the team to consider a new hypothesis about why the turtles seek refuge in Sargassum, a type of seaweed found on the surface of the water in the deep ocean. Sargassum is a habitat long associated with young sea turtles.
“We propose that young turtles remain at the sea surface to gain a thermal benefit,” Mansfield said. “This makes sense because the turtles are cold blooded animals. By remaining at the sea surface, and by associating with Sargassum habitat, turtles gain a thermal refuge of sorts that may help enhance growth and feeding rates, among other physiological benefits.”
Wyneken and Mansfield are currently working under grants from NOAA, Florida Sea Turtle License Plate fund, Save Our Seas Foundation, and several individual donors to conduct further work on the sea turtle “lost years.”
“Our satellite tracks help define Atlantic loggerhead nursery grounds and early loggerhead habitat use,” said Wyneken. “This allows us to reexamine the sea turtle ‘lost years’ paradigms.”
For more information, contact Jeanette Wyneken at 561-297-0146 or firstname.lastname@example.org.
About Florida Atlantic University:
Florida Atlantic University, established in 1961, officially opened its doors in 1964 as the fifth public university in Florida. Today, the University, with an annual economic impact of $6.3 billion, serves more than 30,000 undergraduate and graduate students at sites throughout its six-county service region in southeast Florida. FAU’s world-class teaching and research faculty serves students through 10 colleges: the Dorothy F. Schmidt College of Arts and Letters, the College of Business, the College for Design and Social Inquiry, the College of Education, the College of Engineering and Computer Science, the Graduate College, the Harriet L. Wilkes Honors College, the Charles E. Schmidt College of Medicine, the Christine E. Lynn College of Nursing and the Charles E. Schmidt College of Science. FAU is ranked as a High Research Activity institution by the Carnegie Foundation for the Advancement of Teaching. The University is placing special focus on the rapid development of three signature themes – marine and coastal issues, biotechnology and contemporary societal challenges – which provide opportunities for faculty and students to build upon FAU’s existing strengths in research and scholarship. For more information, visit www.fau.edu
Paige Garrido | newswise
New approach for environmental test on livestock drugs
27.07.2016 | Universität Zürich
Managing an endangered river across the US-Mexico border
18.07.2016 | International Institute for Applied Systems Analysis (IIASA)
Transparent electronics devices are present in today’s thin film displays, solar cells, and touchscreens. The future will bring flexible versions of such devices. Their production requires printable materials that are transparent and remain highly conductive even when deformed. Researchers at INM – Leibniz Institute for New Materials have combined a new self-assembling nano ink with an imprint process to create flexible conductive grids with a resolution below one micrometer.
To print the grids, an ink of gold nanowires is applied to a substrate. A structured stamp is pressed on the substrate and forces the ink into a pattern. “The...
A new Fraunhofer MEVIS method conveys medical interrelationships quickly and intuitively with innovative visualization technology
On the monitor, a brain spins slowly and can be examined from every angle. Suddenly, some sections start glowing, first on the side and then the entire back of...
Researchers at the U.S. Department of Energy's (DOE) Ames Laboratory have discovered an unusual property of purple bronze that may point to new ways to achieve high temperature superconductivity.
While studying purple bronze, a molybdenum oxide, researchers discovered an unconventional charge density wave on its surface.
Munich Physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second.
Temporally varying electromagnetic fields are the driving force behind the whole of electronics. Their polarities can change at mind-bogglingly fast rates, and...
Breakup of continents with two speed: Continents initially stretch very slowly along the future splitting zone, but then move apart very quickly before the onset of rupture. The final speed can be up to 20 times faster than in the first, slow extension phase.phases
Present-day continents were shaped hundreds of millions of years ago as the supercontinent Pangaea broke apart. Derived from Pangaea’s main fragments Gondwana...
29.07.2016 | Event News
15.07.2016 | Event News
15.07.2016 | Event News
29.07.2016 | Power and Electrical Engineering
29.07.2016 | Life Sciences
29.07.2016 | Event News