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Journal of Comparative Physiology A

, Volume 192, Issue 1, pp 1–25 | Cite as

The visual ecology of fiddler crabs

  • Jochen Zeil
  • Jan M. Hemmi
Review

Abstract

With their eyes on long vertical stalks, their panoramic visual field and their pronounced equatorial acute zone for vertical resolving power, the visual system of fiddler crabs is exquisitely tuned to the geometry of vision in the flat world of inter-tidal mudflats. The crabs live as burrow-centred grazers in dense, mixed-sex, mixed-age and mixed-species colonies, with the active space of an individual rarely exceeding 1 m2. The full behavioural repertoire of fiddler crabs can thus be monitored over extended periods of time on a moment to moment basis together with the visual information they have available to guide their actions. These attributes make the crabs superb subjects for analysing visual tasks and the design of visual processing mechanisms under natural conditions, a prerequisite for understanding the evolution of visual systems. In this review we show, on the one hand, how deeply embedded fiddler crab vision is in the behavioural and the physical ecology of these animals and, on the other hand, how their behavioural options are constrained by their perceptual limitations. Studying vision in fiddler crabs reminds us that vision has a topography, that it is context-dependent and pragmatic and that there are perceptual limits to what animals can know and therefore care about.

Keywords

Visual ecology Behaviour Compound eyes Fiddler crabs 

Notes

Acknowledgements

We acknowledge financial support from the Swiss Science Foundation to JMH, from the Human Frontiers Science Program to JZ, from the Centre for Visual Sciences to JMH and JZ, from the Australian National University’s Major Equipment fund and the Research School of Biological Sciences Biotechnology fund to JZ. We thank Waltraud Pix for her keen eye for fiddler crabs and her support with fieldwork and Marilyn Ball for sharing the casi, as well as Martin Hofmann and Katharina Siebke for their support in maintaining it and in analysing data. We are grateful to Ali Alkaladi, Tanya Detto, Martin How, and Doekele Stavenga for allowing us to use unpublished data. We thank Pat Backwell, Norbert Boeddeker, Tanya Detto, Martin How, Michael Jennions, Richard Peters, Waltraud Pix and Mandyam Srinivasan for their constructive comments on earlier versions of the manuscript.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Centre for Visual Sciences, Research School of Biological SciencesThe Australian National UniversityCanberraAustralia

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