Pivotal temperature for loggerhead turtles (Caretta caretta) from Kyparissia Bay, Greece

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Pivotal temperature (the constant temperature giving 50% of each sex) for two clutches of loggerhead sea turtles (Caretta caretta) from Kyparissia Bay, Greece, was 29.3°C. Pivotal incubation duration (the time from laying to hatching giving 50% of each sex) was 52.6 days. These values are close to those obtained for this species in Brazil and the United States, providing further evidence that these characteristics are relatively conservative in different populations. Methodological differences between different experiments and limitations on accuracy of equipment make the detection of small differences problematic. Comparison of incubation durations in the field with the pivotal durations obtained here suggest that hatchling sex ratio on some Mediterranean beaches is female biased but probably varies considerably within this region.

La température charnière (la température constante d'incubation qui produit 50 % d'individus de chaque sexe) pour deux masses d'oeufs de caouanes (Caretta caretta) de la baie de Kyparissia en Grèce a été estimée à 29,3°C. La durée charnière de l'incubation (le temps entre la ponte et l'éclosion qui produit 50 % de tortues de chaque sexe) est de 52,6 jours. Ces valeurs se rapprochent de celles que l'on a obtenues chez cette espèce au Brésil et aux É.-U., ce qui est une indication supplémentaire que ces caractéristiques sont relativement conservatrices dans les différentes populations. Les différences méthodologiques entre les expériences et les limites de précision des appareils rendent problématiques la détection de petites différences. La comparaison des durées de l'incubation en nature avec les durées charnières obtenues ici laisse croire que le rapport mâles : femelles chez les nouveau-nés sur certaines plages méditerranéennes favorise les femelles, mais qu'il varie probablement beaucoup dans la région.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2002

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