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Morphology, density, and sex ratio of fiddler crabs from southern Thailand (Decapoda, Brachyura, Ocypodidae)

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The distribution, morphology, population density, and adult sex ratio of fiddler crabs in southern Thailand were studied. Nine (sub-)species of fiddler crab were found: Uca lactea annulipes (H. Milne Edwards, 1837), U. triangularis bengali Crane, 1975, U. forcipata (Adams & White, 1848), U. vocans hesperiae Crane, 1975, U. lactea perplexa (H. Milne Edwards, 1837), U. rosea (Tweedie, 1937), U. paradussumieri Bott, 1973, U. tetragonon (Herbst, 1790), and U. urvillei (H. Milne Edwards, 1852). Three forms occurred in both the Andaman Sea and the Gulf of Thailand:U.v. hesperiae, U. forcipata, and U.l. annulipes. The population densities of these three were higher in the Andaman Sea. In four species, more than 50% of the males were right-handed: U. tetragonon, U.t. bengali, U.v. hesperiae, and U. forcipata. More than 50% of the males in eight out of the nine species had brachychelous claws. Only U. tetragonon males had brachychelous and leptochelous claws in equal proportions. Six out of nine species in the Andaman Sea and two out of three species in the Gulf of Thailand had male-biased sex ratios. La répartition, la morphologie, la densité de population, et le sex-ratio des crabes violonistes dans le sud de la Thaïlande ont été étudiés. Neuf (sous-)espèces de crabes violonistes ont été trouvées: Uca lactea annulipes (H. Milne Edwards, 1837), U. triangularis bengali Crane, 1975, U. forcipata (Adams & White, 1848), U. vocans hesperiae Crane, 1975, U. lactea perplexa (H. Milne Edwards, 1837), U. rosea (Tweedie, 1937), U. paradussumieri Bott, 1973, U. tetragonon (Herbst, 1790), et U. urvillei (H. Milne Edwards, 1852). Trois formes étaient présentes à la fois dans la mer d'Andaman et le golfe de Thaïlande: U.v. hesperiae, U. forcipata et U.l. annulipes. Les densités de population étaient plus élevées dans la mer d'Andaman. Chez quatre espèces, plus de 50% des mâles étaient droitiers: U. tetragonon, U.t. bengali, U.v. hesperiae et U. forcipata. Plus de 50% des mâles dans huit des neuf espèces avaient des pinces à doigts trapus (brachychèles). Seuls, les mâles de U. tetragonon avaient, à égales proportions, des pinces à doigts trapus ou des pinces à doigts grêles (leptochèles). Six des neuf espèces de la mer d'Andaman et deux des trois espèces du golfe de Thaïlande avaient des sex-ratio en faveur des mâles.

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/content/journals/10.1163/1568540041718000
2004-05-01
2015-09-02

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