Sexual orientation of fiddler crabs

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Performed the experiments: TK. Analyzed the data: TK. Predation is generally thought to constrain sexual selection by female choice and limit the evolution of conspicuous sexual signals.

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E-mail address: daniela. Daniela M. Email: daniela.

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Joana M. To test this hypothesis, 38 males 18 without the major claw and 19 females were randomly captured and placed, individually, in a straight track. After a five-minute adaptation period, an observer walked toward the crab and triggered its escape reaction.

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John H. Christy, Patricia R. Males of the fiddler crab Uca musica sometimes build sand hoods at the entrances of their burrows, to which they attract females for mating with claw waving and other displays. Females significantly more often approached males with hoods than males without hoods, but once at a burrow, they were just as likely to stay and mate whether the male had a hood or not.

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Skip to search form Skip to main content. Christy and Patricia R. ChristyPatricia R.

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Sexual dimorphism in fiddler crabs. Female A and male B Uca panacea. Scale bars indicate 1 cm.

Fiddler crabs, genus Ucaare classic examples of how intense sexual selection can produce exaggerated male traits. However, the morphology of the major claw is highly variable across the approximately species within the genus. Here we address variation, scaling, and correlated evolution in the mechanics of the major claw by analyzing the morphology and mechanical properties of the claws of 21 species of fiddler crabs from the Pacific, Gulf and Atlantic coasts of the Americas.

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Global literature of fiddler crabs, genus Uca Decapoda, Ocypodidae : trends and future directions. Nabout I ; Luis M. Diniz-Filho II. Crabs of the genus Uca Leach, are characterized by having strong sexual dimorphism and a global distribution.

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Either your web browser doesn't support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Risks inherent in mate-searching have led to the assumption that females moving sequentially through populations of courting males are sexually receptive, but this may not be true.

Please take this quick survey to tell us about what happens after you publish a paper. Journal of Comparative Physiology A. Male fiddler crabs Uca pugilator Bosc have visual control systems that enable them to track other crabs in front or behind, and to keep potential predators to the side, where escape is easiest.

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