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- W4246659989 abstract "Male sand fiddler crabs, Uca pugilator (Ocypodidae), possess a single enlarged claw that is used in ritualized contests over breeding burrows. Ability to close the claw forcefully, which increases with claw size and stoutness, may promote success in contests. As the density of males at breeding burrows changes across the lunar cycle, the frequency of contests may also change and affect the advantage associated with a powerful claw. At an Atlantic coast salt water marsh in northern Florida, we investigated claw size, claw stoutness, and pinching force with daily samples of foraging and courting males made across three lunar cycles. Foraging and courting males constituted the vast majority of surface-active males. Foraging males occurred in dense aggregations, droves, on moist, low-elevation sediments. Courting males, recognized by claw-waving displays, were at burrows in dry, high-elevation sediments where they fed relatively little. On average, courting males had greater claw-closing force than droving males but claw length and stoutness did not vary by activity. Claw-closing force, claw length, and claw stoutness of courting males were greatest on and near the days of new or full moons, when the densities of courting males peaked. No temporal patterns were observed for droving males. Mark/recapture of males revealed that claw power declined during courtship and increased while droving. Moreover, males switched from droving to courting as claw power increased and switched from courting to droving as claw power decreased. In the laboratory, the claw-closing force of unfed males decreased over time but rebounded quickly after males were given food. We suggest that males cycle between activities in response to strength and condition. However, it appears that males with larger, stouter claws are more likely to court at new and full moons, when the number of mating-receptive females peaks." @default.
- W4246659989 created "2022-05-12" @default.
- W4246659989 date "1995-11-01" @default.
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- W4246659989 title "Contents of Volume 193" @default.
- W4246659989 doi "https://doi.org/10.1016/0022-0981(95)90027-6" @default.
- W4246659989 hasPublicationYear "1995" @default.
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