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Giant claw helps fiddler crabs stay cool in more ways than one

Date:
August 29, 2011
Source:
University of Chicago Press Journals
Summary:
A male fiddler crab's oversized claw not only looks cool to the ladies, but new research suggests it literally helps crabs to stay cool. Researchers placed crabs under a hot light and took their temperatures. They found that the temperatures of crabs missing their large claw rose faster and reached a higher maximum than intact crabs.
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A male Uca panacea performs the waving display.
Credit: © M. Zachary Darnell

A male fiddler crab's oversized claw not only looks cool to the ladies, but new research suggests it literally helps crabs to stay cool. Researchers Zachary Darnell and Pablo Munguia of the University of Texas placed crabs under a hot light and took their temperatures. They found that the temperatures of crabs missing their large claw rose faster and reached a higher maximum than intact crabs.

The finding suggests that in addition to having a role in mating displays and in fighting off competitors, giant claws aid in thermoregulation.

"The major claw may function like a heat sink, transferring heat away from the body and, through convection, dissipating that heat into the air," Dr. Darnell said. The cooling action may help crabs to spend more time out of their burrows for foraging or sexual display. It might also help offset the energetic costs of such a giant appendage, the researchers say.

The research appears in the September 2011 issue of the The American Naturalist, published by The University of Chicago Press for The American Society of Naturalists.


Story Source:

The above post is reprinted from materials provided by University of Chicago Press Journals. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. Zachary Darnell, Pablo Munguia. Thermoregulation as an Alternate Function of the Sexually Dimorphic Fiddler Crab Claw. The American Naturalist, 2011; 178 (3): 419 DOI: 10.1086/661239

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University of Chicago Press Journals. "Giant claw helps fiddler crabs stay cool in more ways than one." ScienceDaily. ScienceDaily, 29 August 2011. <www.sciencedaily.com/releases/2011/08/110828210731.htm>.
University of Chicago Press Journals. (2011, August 29). Giant claw helps fiddler crabs stay cool in more ways than one. ScienceDaily. Retrieved July 7, 2015 from www.sciencedaily.com/releases/2011/08/110828210731.htm
University of Chicago Press Journals. "Giant claw helps fiddler crabs stay cool in more ways than one." ScienceDaily. www.sciencedaily.com/releases/2011/08/110828210731.htm (accessed July 7, 2015).

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