...Alexa Tullis; Corinne H. T. Straube ABSTRACT Models proposed to explain sexually selected structures assume that these traits are costly. However, studies investigating the impact of such structures on locomotory costs have produced inconsistent results. Male fiddler crabs possess a large sexually...

...Martin J. How; John Christy; Nicholas W. Roberts; N. Justin Marshall The polarisation of light is used by many species of cephalopods and crustaceans to discriminate objects or to communicate. Most visual systems with this ability, such as that of the fiddler crab, include receptors...

... to be harmless? We tested whether the fiddler crab Uca vomeris distinguishes objects purely by their sensory signature or whether identification also involves more complex attributes such as the direction from which an object approaches. We found that crabs habituated their escape responses after repeated...

...Premraj Rajkumar; Stephanie M. Rollmann; Tiffany A. Cook; John E. Layne SUMMARY Fiddler crabs are intertidal brachyuran crabs that belong to the genus Uca . Approximately 97 different species have been identified, and several of these live sympatrically. Many have species-specific body color...

...Joana M. Jordão; Thomas W. Cronin; Rui F. Oliveira SUMMARY Fiddler crabs have compound eyes that are structurally fairly well understood. However, there has been much debate regarding their spectral sensitivity and capacity to enable colour discrimination. We examined the visual pigments of two...

...Jan M. Hemmi; Justin Marshall; Waltraud Pix; Misha Vorobyev; Jochen Zeil SUMMARY Colour changes in fiddler crabs have long been noted, but a functional interpretation is still lacking. Here we report that neighbouring populations of Uca vomeris in Australia exhibit different degrees of carapace...

...John E. Layne; W. Jon P. Barnes; Lindsey M. J. Duncan SUMMARY Fiddler crabs Uca rapax are central-place foragers, making feeding excursions of up to 2 m from their burrows. We describe the natural feeding excursions of path-integrating fiddler crabs and analyze their paths for signs of significant...

...John E. Layne; W. Jon P. Barnes; Lindsey M. J. Duncan SUMMARY Fiddler crabs Uca rapax are central-place foragers, making feeding excursions of up to several meters from their burrows. This study investigates the sources of directional and distance information used by these crabs when returning...

... and the failure of identifying a competitor could be very costly. How does an animal decide whether another animal is or is not a threat to a resource or a territory? Fiddler crabs [ Uca vomeris (McNeill)] operate from burrows that they guard and defend vigorously against other crabs. The crabs live in dense...

...Jan M. Hemmi; J. Zeil SUMMARY Using crab-like dummies, we have shown previously that fiddler crabs[ Uca vomeris (McNeill)] defend their burrows against intruders in a burrow-centred frame of reference. The crabs respond whenever an intruder approaches to within a certain distance of the burrow...

...Jochen Zeil; Martin Hofmann SUMMARY Fiddler crabs inhabit intertidal sand- and mudflats, where they live in dense colonies and are active on the surface during low tide. They exhibit a rich behavioural repertoire, with frequent interactions between animals in the context of territorial and mating...

...John E. Layne ABSTRACT Fiddler crabs ( Uca pugilator Bosc; Crustacea, Decapoda) feed and court in open, flat spaces. Their visual system has several putative adaptations to their flat habitat, including the tendency to keep the vertical axis of their eyes perpendicular to the plane...