Adult Sex Ratio of a Population of the Japanese Salamander, Hynobius tokyoensis (Caudata: Hynobiidae)

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概要

• 論文の詳細を見る

• Adult sex ratio is considered to be a key factor in understanding sexual selection, mating behavior, life history and population dynamics. Following Fisher (1930), a general consensus was formed that sex ratio tends to be largely balanced. However, gainsaying this, large variations in sex ratio have been reported among populations and species of amphibians. There is little information on sex ratio in natural populations of Japanese hynobiid salamanders. To help fill this gap, we conducted a long-term census of a population of Hynobius tokyoensis from 1976 to 1985 and estimated the adult sex ratio (the proportion of males within the population) at 0.578 from data gathered during eight non-breeding seasons. The bootstrap 95% confidence interval was 0.516–0.641. The study showed that the adult sex ratio was significantly biased toward males in the population studied; it was nearly 1.5:1 (males:females). Age at first reproduction is 1 year later in females, which suggests that the most likely factor driving the unbalanced sex ratio is the differential maturation rate between the sexes.

• 日本爬虫両棲類学会の論文

著者

• Inoue Masafumi

  Kyoto University

• Kusano Tamotsu

  Department of Biology, Faculty of Science, Tokyo Metropolitan University

• INOUE Masafumi

  Kyoto Kagaku Co. Ltd.

• KUSANO Tamotsu

  Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University

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• Body Size and Age Structure of Breeding Populations of the Salamander, Hynobius tokyoensis (Caudata: Hynobiidae)
• Validity of Back-calculation Methods of Body Size from Phalangeal Bones : An Assesment Using Data for Rana japonica
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• Natural Egg Mortality and Clutch Size of the Japanese Treefrog, Rhacophorus arboreus (Amphibia: Rhacophoridae)
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