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A Persistent, Light-Preference Rhythm in the Fiddler Crab, Uca pugnax and Its Possible Adaptive Significance

John D. Palmer
The American Naturalist
Vol. 98, No. 903 (Nov. - Dec., 1964), pp. 431-434
Stable URL: http://www.jstor.org/stable/2459145
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Persistent, Light-Preference Rhythm in the Fiddler Crab, Uca pugnax and Its Possible Adaptive Significance
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Abstract

1) A method is described in which the orientational response of fiddler crabs to a constant source of light was measured automatically and continuously. 2) Using this method a persistent light-preference rhythm was found in the fiddler crab, Uca pugnax. The crabs were maximally attracted to light in the early morning hours, responded positively during daylight hours and responded negatively to light at night. 3) The possible ecological significance of such a rhythm is discussed.

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