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Foraging Success of the Tropical Frog, Eleutherodactylus coqui: The Cost of Calling

Lawrence L. Woolbright and Margaret M. Stewart
Copeia
Vol. 1987, No. 1 (Feb. 11, 1987), pp. 69-75
DOI: 10.2307/1446039
Stable URL: http://www.jstor.org/stable/1446039
Page Count: 7
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Abstract

Foraging success of Eleutherodactylus coqui was estimated from stomach contents. Stomach content volume increased with frog body size as a result of the selection of larger prey by larger frogs. Number of prey per stomach was inversely related to body size. Non-calling frogs had eaten most of their night's food by 2400 h. Males called mainly before midnight and did not forage while calling. Calling males had eaten only 18% of their night's food by 2400 h. Calling males ate prey that did not differ in size from those of non-calling animals. However, they ate fewer prey items and ended the night with less food volume in their stomachs than expected for their body sizes. Foraging success of all groups was reduced during the dry season. The reduction was less pronounced for calling males because they spend less time calling in the dry season than in the wet season. On a yearly basis, males appear to lose 16% of their potential food intake because of calling activity.

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