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Onkonburi, J., & Formanowicz, D. R. (1997). The effect of prey vulnerability on predator preference. Ethology, Ecology, and Evolution, 9, 19–25. 
Added by: Admin (17 Aug 2008 18:54:54 UTC)
Resource type: Journal Article
BibTeX citation key: Onkonburi1997
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Categories: General
Keywords: Chelidae, Mesoclemmys, Mesoclemmys gibba, Phrynops, Schildkröten = turtles + tortoises, Verhalten = ethology
Creators: Formanowicz, Onkonburi
Collection: Ethology, Ecology, and Evolution
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Abstract     
We examined the effect of prey vulnerability on the prey choice behaviour of the turtle Phrynops gibbus in a series of laboratory experiments using two sizes and states (mobile and immobile) of prey. Our results suggest that prey vulnerability (ease of capture) alters the apparent choice of prey by these turtles. When vulnerability was low, turtles consumed significantly more small prey and when vulnerability was high they consumed significantly more large prey exhibiting what has been respectively referred to in the foraging literature as passive and active prey choice. We suggest that the distinction between passive and active prey choice may be misleading and that the interaction between forager behaviour and prey antipredator behaviour should be considered in studies of nonrandom predator diets.
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