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Registros recuperados: 5
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Contrasted habitats and individual plasticity drive the fine scale movements of juvenile green turtles in coastal ecosystems ArchiMer
Chambault, Philippine; Dalleau, Mayeul; Nicet, Jean-benoit; Mouquet, Pascal; Ballorain, Katia; Jean, Claire; Ciccione, Stéphane; Bourjea, Jerome.
Background A strong behavioural plasticity is commonly evidenced in the movements of marine megafauna species, and it might be related to an adaptation to local conditions of the habitat. One way to investigate such behavioural plasticity is to satellite track a large number of individuals from contrasting foraging grounds, but despite recent advances in satellite telemetry techniques, such studies are still very limited in sea turtles. Methods From 2010 to 2018, 49 juvenile green turtles were satellite tracked from five contrasting feeding grounds located in the South-West Indian Ocean in order to (1) assess the diel patterns in their movements, (2) investigate the inter-individual and inter-site variability, and (3) explore the drivers of their daily...
Tipo: Text Palavras-chave: Chelonia mydas; Home range; Satellite tracking; Diel pattern; Tidal cycle.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71269/69659.pdf
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Ecologie trophique de la tortue verte Chelonia mydas dans les herbiers marins et algueraies du sud-ouest de l’océan Indien ArchiMer
Ballorain, Katia.
Reproduction of sea turtles primarily relies on body reserves stored during the time spent on foraging grounds prior to the nesting season. Accordingly, the investigation of foraging behaviour of sea turtles is critical for better assessing their biology but also for conservation issues of these endangered species. Sea turtles contribute significantly to the consuming biomass of their ecosystem and hence to its functioning, thus providing natural indications of the health of the ecosystem. Yet the trophic ecology of sea turtles is poorly documented because their feeding grounds remain poorly known and for most of them hardly accessible. Among sea turtles the green turtle is the only species where sub-adults and adults are mostly herbivorous feeding on...
Tipo: Text Palavras-chave: Tortue verte Chelonia mydas; Herbier marin; Phanérogame; Algueraie; Mayotte; Réunion; Sud-ouest de l’Océan Indien; Écologie trophique; Green turtles Chelonia mydas; Seagrass; Algae; Mayotte; Reunion Island; Southwestern Indian Ocean; Trophic ecology.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00031/14254/11538.pdf
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Habitat use of a multispecific seagrass meadow by green turtles Chelonia mydas at Mayotte Island ArchiMer
Ballorain, Katia; Ciccione, Stephane; Bourjea, Jerome; Grizel, Henri; Enstipp, Manfred; Georges, Jean-yves.
We investigated the habitat use in green turtles exploiting a 13-ha multispecific seagrass meadow at Mayotte Island, south-western Indian Ocean. A phytoecological survey shows the occurrence of eight seagrass species, dominated by Halodule uninervis and Syringodium isoetifolium, distributed according to four distinct seagrass communities along the depth gradient. Direct underwater censuses show that green turtles occurred all over the meadow. Yet when community relative surface area was taken into account green turtles preferentially frequented the most seaward, biomass-richer S. isoetifolium-dominated community, suggesting that green turtles compensate for their intrinsically nutrient-poor herbivorous diet. Additionally, smaller (\80 cm standard curved...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12918/10201.pdf
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Plan national d’actions en faveur des tortues marines sur les territoires français du sud-ouest de l’océan Indien 2015-2020. Mayotte, Réunion, Îles Éparses. Diagnostic, stratégie opérationnelle et actions régionales. Volume 1. Partie commune ArchiMer
Philippe, Jean-sébastien; Bourjea, Jerome; Ciccione, Stéphane; Ballorain, Katia; Marinesque, Sophie; Glenard, Zoé.
Tipo: Text
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00345/45599/45421.pdf
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Ultralight aircraft surveys reveal marine turtle population increases along the west coast of Reunion Island ArchiMer
Jean, Claire; Ciccione, Stephane; Ballorain, Katia; Georges, Jean-yves; Bourjea, Jerome.
Reunion Island in the south-west Indian Ocean once had significant nesting populations of marine turtles but they declined rapidly after human colonization. In 1996, after regular sightings of turtles offshore, an aerial survey programme was initiated to monitor the occurrence of marine turtles and their distribution along the west coast of the island Between 1998 and 2008, along a 30-km coastline transect between Saint Leu and Saint Paul, a total of 1,845 marine turtle sightings were recorded during 146 flights with an ultralight aircraft The mean number of turtle sightings per survey increased significantly between 1998 and 2008, and a variety of sizes were recorded throughout the year Marine turtles were found over coral reef zones and on the outer reef...
Tipo: Text Palavras-chave: Abundance; Aerial survey; Conservation; Indian Ocean; Marine turtles; Reunion Island.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00005/11588/9280.pdf
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