Literaturdatenbank
Literaturdatenbank |
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Tucker, A. D., Yeomans, S. R., & Gibbons, J. W. (1997). Shell strength of mud snails (ilyanassa obsoleta) may deter foraging by diamondback terrapins (malaclemys terrapin). American Midland Naturalist, 138, 224–229.
Added by: Admin (17 Aug 2008 17:24:01 UTC) Last edited by: Sarina Wunderlich (17 Oct 2008 16:08:27 UTC) |
| Resource type: Journal Article BibTeX citation key: Tucker1997e View all bibliographic details  |
Categories: General Keywords: Emydidae, Ernährung = nutrition, Habitat = habitat, Malaclemys, Malaclemys terrapin, Nordamerika = North America, Schildkröten = turtles + tortoises, Verhalten = ethology Creators: Gibbons, Tucker, Yeomans Collection: American Midland Naturalist |
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| Abstract |
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ABSTRACT-Diamondback terrapins (Malaclemys terrapin) do not eat the common and abundant mud snail (Ilyanassa obsoleta) even though terrapin diets are dominated by similarly sized gastropods. To resolve this paradox, we tested a structural defense hypothesis as tire potential deterrent against predation. We compared resistance to compressive force of Ityanassa and three invertebrates (Littorina irrorala,) Uca spp, and Callinectes sapidus) that terrapins commonly eat. Ilyanassa shells were 2-3 times more resistant to crushing than the other prey. High processing costs for mud snails (in terms of structural resistance to crushing) may deter predation by terrapins despite the low search costs and equivalent energetic returns relative to alternative prey items.
Added by: Admin Last edited by: Sarina Wunderlich |