The spatial ecology of juvenile loggerhead turtles (Caretta caretta) in the Indian Ocean sheds light on the "lost years" mystery

Type Article
Date 2014-08
Language English
Author(s) Dalleau Mayeul1, 2, 3, 4, Benhamou Simon2, Sudre Joel5, Ciccione Stephane3, Bourjea JeromeORCID4
Affiliation(s) 1 : Univ La Reunion, UMR Espace Dev, St Denis 97715 9, Reunion.
2 : CNRS, Ctr Ecol Fonct & Evolut, F-34293 Montpellier 5, France.
3 : Kelonia, Observ Tortues Marines La Reunion, St Leu 97436, Reunion.
4 : IFREMER, Le Port 97822, Reunion.
5 : CNRS, Lab Etud Geophys & Oceanog Spatiale, F-31401 Toulouse 9, France.
Source Marine Biology (0025-3162) (Springer), 2014-08 , Vol. 161 , N. 8 , P. 1835-1849
DOI 10.1007/s00227-014-2465-z
WOS© Times Cited 19
Abstract While our understanding of the early oceanic developmental stage of sea turtles has improved markedly over recent decades, the spatial context for this life history stage remains unknown for Indian Ocean loggerhead turtle populations. To address this gap in our knowledge, 18 juvenile loggerheads were satellite tracked from Reunion Island (21.2A degrees S, 55.3A degrees E) between 2007 and 2011. Nine turtles swam north toward Oman (20.5A degrees N, 58.8A degrees E), where one of the world's largest rookeries of loggerheads is located. Three individuals traveled south toward South Africa and Madagascar, countries that also host loggerhead nesting grounds. Fourteen of the transmitters relayed diving profiles. A dichotomy between diurnal and nocturnal diving behavior was observed with a larger number of shorter dives occurring during the day. Diving behavior also differed according to movement behavior as individuals spent more time in subsurface waters (between 10 and 20 m) during transit phases. The study provides an understanding of the oceanic movement behavior of juvenile loggerheads in the Indian Ocean that suggests the existence of an atypical trans-equatorial developmental cycle for the species at the ocean basin scale in the Indian Ocean. These results address a significant gap in the understanding of loggerhead oceanic movements and may help with the conservation of the species.
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