Influence de la temperature sur la differentiation sexuelle des gonades chez la tortue luth (Dermochelys coriacea ); etude en incubation artificielle et naturelle

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Contributeur(s) Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1985
Identifiant documentaire 9-1241
Identifiant OAI oai:archimer.ifremer.fr:1241
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Auteur(s): Rimblot, F,Fretey, J,Lescure, J,Pieau, C
Mots clés Dermochelys coriacea Chelonia mydas Reptilia Hatcheries Natural populations Incubation Turtle culture Eggs Temperature effects Sexual dimorphism
Date de publication 01/12/1983
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Langue fre
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Droits de réutilisation info:eu-repo/semantics/openAccess

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Description
Sexual differentiation of the marine leatherback turtle is sensitive to temperature. Incubation of eggs below 29 degree C results in 100% males, whereas incubationa bove 30 degree C results in 100% potential females at hatching. Therefore, the threshold temperature lies between 29 and 30 degree C as has been found for other marine turtles (Caretta caretta, Chelonia mydas ). Among hatchlings from natural nests in French Guiana, 10% were males, 20% were potential females and 70% had an intermediate phenotype. The sand temperature at 60 cm of depth, near one nest, was recorded and was found to vary between 29 and 30 degree C during the presumed thermosensitive period. These results will be useful to marine turtle hatcheries which seek to manipulate sex ratios among their neonates.
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