Female-biased Mortality and Its Consequence on Adult Sex Ratio in the Freshwater Turtle Chinemys reevesii on an Island

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概要

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• A mark-recapture study of the fresh water turtle Chinemys reevesii was conducted on a small (190 ha) island, Ishima Island, off the east coast of Shikoku to learn the demographic characteristics of an insular turtle population. Most of the Chinemys reevesii on the island were marked, yielding a reliable estimate of population size (1179 turtles per 15 ha aquatic habitats). The estimated sex ratio of the turtles in the younger age class (3-6yr) was essentially equal, slightly skewed toward males in a higher age class, and significantly male-biased in the older age class (>12yr). A significantly female-biased sex ratio among the turtles found dead was compatible with the male-biased sex ratio in adult turtles. Possible physiological and ecological factors for change in sex ratio with age are discussed with consideration of the insular environment.

• 日本爬虫両棲類学会の論文

著者

• Hasegawa Masami

  Department Of Biology Faculty Of Science Toho University

• Hasegawa M

  Toho Univ. Chiba Jpn

• TAKENAKA TOSHIAKI

  Department of Soil Zoology, Institute of Environmental Science and Technology, Yokohama National Uni

• HASEGAWA MASAMI

  Department of Ecological Science, Natural History Museum and Institute

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