FN Archimer Export Format
PT J
TI Loggerhead turtle oceanic-neritic habitat shift reveals key foraging areas in the Western Indian Ocean
BT 
AF MONSINJON, Jonathan
   Laforge, Antoine
   Gaspar, Philippe
   Barat, Anne
   Bousquet, Olivier
   Ciccione, Stéphane
   Jean, Claire
   Ballorain, Katia
   Dalleau, Mayeul
   Coelho, Rui
   Bonhommeau, Sylvain
   Bourjea, Jerome
AS 1:1;2:2,3;3:2;4:3;5:3,4;6:5;7:5;8:6;9:6;10:7;11:1;12:8;
FF 1:PDG-RBE-DOI;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:PDG-RBE-DOI;12:PDG-RBE-MARBEC-LHM;
C1 Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Délégation Océan Indien (DOI), Le Port, La Réunion, France
   Mercator Ocean International, Toulouse, France
   Laboratoire de l'Atmosphère et des Cyclones (LACy Laboratory), University of La Réunion, Saint-Denis, La Réunion, France
   Institute for Coastal and Marine Research, Nelson Mandela University, Port Elizabeth, South Africa
   Kelonia, Marine Turtle Observatory and Rescue Center, Saint-Leu, La Réunion, France
   Centre d’Etude et de Découverte des Tortues Marines (CEDTM), Piton Saint-Leu, La Réunion, France
   Portuguese Institute for the Ocean and Atmosphere, I.P. (IPMA), Olhão, Portugal
   Unité Mixte de Recherche (UMR), Marine Biodiversity Exploitation and Conservation (MARBEC), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD), University of Montpellier, Sète, France
C2 IFREMER, FRANCE
   MERCATOR OCEAN, FRANCE
   UNIV LA REUNION, FRANCE
   UNIV NELSON MANDELA, SOUTH AFRICA
   KELONIA, FRANCE
   CEDTM, FRANCE
   IPMA, PORTUGAL
   IFREMER, FRANCE
SI LA REUNION
   SETE
SE PDG-RBE-DOI
   PDG-RBE-MARBEC-LHM
UM MARBEC
IN WOS Ifremer UPR
   WOS Ifremer UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 3.7
TC 2
UR https://archimer.ifremer.fr/doc/00849/96133/104268.pdf
   https://archimer.ifremer.fr/doc/00849/96133/104269.zip
LA English
DT Article
DE ;behavioral ecology;marine megafauna;migration;satellite tracking;telemetry;ontogenetic shift;hidden Markov model;Caretta caretta
AB Loggerhead sea turtles (Caretta caretta) use both oceanic and neritic habitats depending on their life stage, eventually undertaking an ontogenetic shift. Juveniles likely start foraging in a purely opportunistic manner and later seek resources more actively. In the Indian Ocean, it is still unclear where oceanic-stage individuals go, what they do, and importantly where they forage. Yet, such information is crucial to protect this endangered species from anthropogenic threats such as bycatch in fisheries. To address this, 67 individuals (66 late juveniles and one adult) bycaught in the open ocean were equipped with satellite tags and released in the Southwestern Indian Ocean between 2008 and 2021. Most individuals traveled to the Northwestern Indian Ocean where they used neritic habitats of the continental shelf (i.e., largely between 0 and 200-m depth). Using hidden Markov models, we identified three types of movements likely associated with traveling, wandering, and foraging behaviors. We found that the movement characteristics of these behaviors differ depending on turtles’ target destination and habitat (oceanic vs neritic), highlighting different strategies of habitat use among individuals of presumably the same life stage (late juveniles). The turtles that traveled to the Northwestern Indian Ocean encountered warmer waters (mean = 27.6°C, min. = 20.6°C, max. = 33.1°C) than their counterparts remaining in the Southern Hemisphere (mean = 22.5°C, min. = 14.6°C, max. = 29.7°C) but were found foraging at locations with comparable biomass of potential prey (mean = 2.5 g C m-2, min. = 0.5 g C m-2, max. = 10.4 g C m-2) once in the Northern Hemisphere. It remains obscure why these individuals undertook a trans-equatorial migration. Once in neritic habitats, the proportion of time spent traveling was considerably reduced (from 33% to 19%) and allocated to foraging instead. In light of this, it is very likely that the individuals migrated to the Northwestern Indian Ocean to undergo an oceanic-to-neritic ontogenetic shift. Our study sheds light on the behavioral ecology of loggerhead turtles and identifies important foraging areas in the Western Indian Ocean, with the top-three most densely used ones being the Gulf of Oman, the Central Somali Coast, and the Western Arabian Sea. 
PY 2023
PD AUG
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 10
UT 001051980300001
DI 10.3389/fmars.2023.1204664
ID 96133
ER

EF