|
|
|
|
|
| Luschi, Paolo; Benhamou, Simon; Girard, Charlotte; Ciccione, Stéphane; Roos, David; Sudre, Joël; Benvenuti, Silvano. |
| Marine turtles are renowned long-distance navigators, able to reach remote targets in the oceanic environment; yet the sensory cues and navigational mechanisms they employ remain unclear [1-3]. Recent arena experiments indicated an involvement of magnetic cues in juvenile turtles' homing ability after simulated displacements [4, 5], but the actual role of geomagnetic information in guiding turtles navigating in their natural environment has remained beyond the reach of experimental investigations. In the present experiment, twenty satellite-tracked green turtles (Chelonia mydas) were transported to four open-sea release sites 100-120 km from their nesting beach on Mayotte island in the Mozambique Channel; 13 of them had magnets attached to their head [6]... |
| Tipo: Text |
|
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2407.pdf |
| |
|
|
| Girard, Charlotte; Sudre, Joël; Benhamou, Simon; Roos, David; Luschi, Paolo. |
| As open sea navigators, green turtles Chelonia mydas have to deal with oceanic currents. These currents may have a mechanical influence, forcing turtles away from their desired course, but they may also provide information to navigating turtles by bringing chemical cues down-current from their target area. In the present paper, we have introduced new path analysis methods, coupling remote-sensing oceanographic data and satellite-tracking data in order to test these hypotheses. These methods were exemplified on the homing routes of 3 green turtles nesting on Europa, an isolated island in the southern part of Mozambique Channel. The turtles, displaced by ship east-southeast from Europa, returned to their nesting island in 13 to 59 d, following long,... |
| Tipo: Text |
Palavras-chave: Sea turtle; Satellite telemetry; Oceanography; Navigation; Homing; Current drift. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1984.pdf |
| |
|
|
| Narazaki, Tomoko; Nakamura, Itsumi; Aoki,, Kagari; Iwata, Takashi; Shiomi, Kozue; Luschi, Paolo; Suganuma, Hiroyuki; Meyer, Carl G.; Matsumoto, Rui; Bost, Charles A.; Handrich, Yves; Amano, Masao; Okamoto, Ryosuke; Mori, Kyoichi; Ciccione, Stephane; Bourjea, Jerome; Sato, Katsufumi. |
| Advances in biologging technology have enabled 3D dead-reckoning reconstruction of marine animal movements at spatiotemporal scales of meters and seconds. Examining high-resolution 3D movements of sharks (Galeocerdo cuvier, N = 4; Rhincodon typus, N = 1), sea turtles (Chelonia mydas, N = 3), penguins (Aptenodytes patagonicus, N = 6), and marine mammals (Arctocephalus gazella, N = 4; Ziphius cavirostris, N = 1), we report the discovery of circling events where animals consecutively circled more than twice at relatively constant angular speeds. Similar circling behaviors were observed across a wide variety of marine megafauna, suggesting these behaviors might serve several similar purposes across taxa including foraging, social interactions, and navigation. |
| Tipo: Text |
Palavras-chave: Ecology; Biological Sciences; Zoology; Animals; Ethology. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00685/79664/82429.pdf |
| |
|
|
| Benhamou, Simon; Sudre, Joël; Bourjea, Jerome; Ciccione, Stephane; De Santis, Angelo; Luschi, Paolo. |
| Background: Laboratory and field experiments have provided evidence that sea turtles use geomagnetic cues to navigate in the open sea. For instance, green turtles (Chelonia mydas) displaced 100 km away from their nesting site were impaired in returning home when carrying a strong magnet glued on the head. However, the actual role of geomagnetic cues remains unclear, since magnetically treated green turtles can perform large scale (.2000 km) post-nesting migrations no differently from controls. Methodology/Principal Findings: In the present homing experiment, 24 green turtles were displaced 200 km away from their nesting site on an oceanic island, and tracked, for the first time in this type of experiment, with Global Positioning System (GPS), which is able... |
| Tipo: Text |
|
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00048/15958/13390.pdf |
| |
|
|
|
