Elsevier

Oceanologica Acta

Volume 21, Issue 2, March–April 1998, Pages 383-388
Oceanologica Acta

Facteurs de mortalité observés chez les tortues marines dans le golfe de GascogneFactors of mortality of marine turtles in the Bay of Biscay

https://doi.org/10.1016/S0399-1784(98)80025-XGet rights and content

Abstract

Factors of mortality in marine turtles near the French coast of the Bay of Biscay have been recorded for four species: leatherback (Dermochelys coriacea), loggerhead (Caretta caretta), Ridley's turtle (Lepidochelys kempii) and green turtle (Chelonia mydas). Most accidental captures of D. coriacea by fishing gears lead to drowning, but the main threat for the species is the ingestion of floating waste. Plastic bags induce occlusion or lesions in the stomach and subsequent death. For C. caretta, L. kempii and C. mydas, the pathology points out mainly two features: external or internal mycosis.

Résumé

L'examen de 230 tortues marines trouvées sur la côte française du golfe de Gascogne a permis de rechercher les facteurs de mortalité chez quatre espèces: Tortue Luth (Dermochelys coriacea), Caouanne (Caretta caretta), Tortue de Kemp (Lepidochelys kempii) et Tortue verte (Chelonia mydas). La noyade consécutive aux captures accidentelles dans les engins de pêche est fréquente chez D. coriacea et l'ingestion de déchets flottants présente, à long terme, une grave menace pour l'espèce. Les morceaux de plastique provoquent des occlusions ou des lésions infectieuses de l'estomac, dont l'issue est fatale. Chez C. caretta, L. kempii et C. mydas, les lésions dominantes sont celles dûes aux mycoses externes et internes.

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