Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Sea turtles’ first days of life: A sprint and a ride towards safety

24.10.2014

Scientists follow hatchlings from Cape Verde with tiny acoustic transmitters

With new nano-sized acoustic transmitters, scientists from GEOMAR Helmholtz Centre for Ocean Research Kiel, the Turtle Foundation and Queen Mary University of London were able to follow the pathways of loggerhead turtle hatchlings from Cape Verde.


Turtle hatchling with nano-tag. Photo: Rebecca Scott, GEOMAR

The tiny animals quickly swim through predator-rich coastal waters and are then dispersed by nearby ocean currents. According to the study, which was primarily funded by the Kiel Cluster of Excellence “The Future Ocean”, the local oceanic conditions are believed to drive the evolution of some unique swimming behaviours. The results are published in the current issue of the Proceedings of the Royal Society B.

Loggerhead turtles (Caretta caretta) from Cape Verde start their lives with a swimming sprint and a ride on favourable ocean currents. In this way, they escape quickly from predator-rich coastal areas and make their way to the safer open ocean where they spend several years feeding and growing. In this study, tiny acoustic transmitters provided direct insight into these pathways for the first time.

“Thanks to the new technology we can start to fill in key information gaps about the so-called ‘lost years’ Dr. Rebecca Scott states. Funded by the Kiel Cluster of Excellence “The Future Ocean”, the marine biologist coordinated a joint study of GEOMAR Helmholtz Centre for Ocean Research Kiel, the Turtle Foundation and the School of Biological and Chemical Sciences and Dr. Christophe Eizaguirre at the Queen Mary University of London.

“Scientists call this early life phase the ‘lost years’, because they were not able to follow new-born sea turtle hatchlings very far. Hatchlings essentially disappear into the sea until many years later when the lucky survivors return to where they born to breed. But with new techniques like nano-tags and ocean models we are able to see where the tiny young animals go. This is important because the dispersal experiences of hatchlings drive the development of their behaviours into adulthood. The more we understand about the biological and physical determinants of their dispersal and swimming behaviours, the easier we can protect this endangered species.”

In cooperation with the Turtle Foundation at Boa Vista, Cape Verde, the scientists collected hatchlings from two beaches in the northwest and southern tip of the island. Acoustic transmitters with a five millimetres wide and twelve millimetres long streamlined shape that weigh 0,4 grams in water were glued onto the shell of eleven hatchlings. The turtles were then followed at sea using a boat and acoustic receiver for up to eight hours and 15 kilometres. In addition, the swimming behaviour of 16 hatchlings were monitored in “hatchling swimming pools” for several days using data loggers made by engineers at GEOMAR. The turtles swam continuously during their first 24 hours after hatching and then switched to a pattern of activity at daytime and inactivity at night.

Due to the close proximity of offshore currents in this region, it seems the Cape Verdean hatchlings can sleep more at night than hatchlings from other places. For example in America, different research groups have shown that they would have swim a lot more to reach offshore currents”, Dr. Scott explains. “Deep oceanic water and favourable currents, which then determined the travel directions and speeds of our Cape Verdean turtles are situated very near to their nests. Therefore, it is very beneficial for turtles if local oceanic conditions drive the evolution of swimming behaviours that are unique to different nesting locations to ensure their best survival outcomes. It seems that turtles are born with these unique locally adapted behaviours.”

Finally, because larger animals kept swimming for a longer time than smaller individuals, a larger body size is thought to be a good sign of fitness. “But there is some evidence emerging that higher nest temperatures may reduce the size of hatchlings. Therefore, it might be possible that global warming decreases the fitness of the sea turtles by threatening them in more subtle ways than just obvious dangers like the loss of nesting beaches”, Dr. Scott assumes.

Original publication:
Scott, R., Biastoch, A., Roder, C., Stiebens, V. A. and Eizaguirre, C., 2014: Nano-tags for neonates and ocean-mediated swimming behaviours linked to rapid dispersal of hatchling sea turtles. Proc. R. Soc. B., 218, 20141209, doi:10.1098/rspb.2014.1209

Links:
Cluster of Excellence “The Future Ocean”
Turtle Foundation
The School of Biological and Chemical Sciences at the Queen Mary University of London

Contact:

Rebecca Scott (GEOMAR, FB3-EV), Tel.: +49 431 600-4569, rscott@geomar.de
Maike Nicolai (GEOMAR Communication & Media) Tel.: +49 431 600-2807, mnicolai@geomar.de

Maike Nicolai | Eurek Alert!
Further information:
http://www.geomar.de/en/news/article/der-start-ins-leben-ein-sprint-und-ein-ritt-auf-der-stroemung/

Further reports about: Cluster of Excellence GEOMAR Ocean Ocean Research Turtle acoustic hatchlings swimming tiny transmitters

More articles from Life Sciences:

nachricht Topologische Quantenchemie
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

nachricht Topological Quantum Chemistry
21.07.2017 | Max-Planck-Institut für Chemische Physik fester Stoffe

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

Stanford researchers develop a new type of soft, growing robot

21.07.2017 | Power and Electrical Engineering

Vortex photons from electrons in circular motion

21.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>