Factors of mortality of marine turtles in the Bay of Biscay. 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 (Car&a carettu), 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. car-etta, L. kempii and C. mydas, the pathology points out mainly two features: external or internal mycosis. 0 Elsevier, Paris Chelonian I marine turtle I pathology I pollution / Bay of Biscay RCsumC -L'examen de 230 tortues marines trouvees sur la cbte franqaise du golfe de Gascogne a permis de rechercher les facteurs de mortalite chez quatre especes : Tortue Luth (Dermochelys coriacea), Caouanne (Caretta caretta), Tortue de Kemp (Lepidochelys kempii) et Tortue verte (Chelonia mydas). La noyade consecutive aux captures accidentelles dans les engins de p&he est frequente chez D. coriacea et l'ingestion de dechets flottants presente, a long terme, une grave menace pour l'espece. Les morceaux de plastique provoquent des occlusions ou des lesions infectieuses de l'estomac, dont l'issue est fatale. Chez C. caretta, L. kempii et C. mydas, les lesions dominantes sont celles dues aux mycoses externes et internes.
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