Performance Consequences of a Trophic Polymorphism: Feeding Behavior in Typical and Cannibal Phenotypes of Ambystoma tigrinum

Aquatic feeding behavior, prey capture performance, and morphological aspects of the feeding mechanism were compared in typical and cannibal phenotypes of Ambystoma tigrinum melanostictum to test the hypothesis that the trophic polymorphism affords a performance advantage in feeding. Similar-sized s...

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Published in:Copeia 1992-08, Vol.1992 (3), p.672-679
Main Authors: Reilly, Stephen M., Lauder, George V., Collins, James P.
Format: Article
Language:English
Subjects:
Ambystoma tigrinum
Animal and plant ecology
Animal cannibalism
Animal morphology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Jaw
Larvae
Larval development
Mouth
Phenotypic traits
Reptilia. Amphibia
Salamanders
Surgical suction
Vertebrata
Vomer
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creator Reilly, Stephen M.
Lauder, George V.
Collins, James P.
description Aquatic feeding behavior, prey capture performance, and morphological aspects of the feeding mechanism were compared in typical and cannibal phenotypes of Ambystoma tigrinum melanostictum to test the hypothesis that the trophic polymorphism affords a performance advantage in feeding. Similar-sized salamanders of the two phenotypes differed morphologically in size of the vomerine tooth patches and head width but not in size of the gape or mass of the hyoid retractor muscles used in suction feeding. Suction feeding and prey handling performance did not differ between the two morphs feeding on live guppies or small conspecific salamanders. However, differences were found in willingness to feed on conspecifics and prey handling performance when feeding on larger salamander larvae. Thus, cannibal morphs possess a significant performance advantage only during predation on large conspecifics. The performance advantage on large prey appears to be a consequence of greater prey handling ability facilitated by the increased size of the vomerine tooth patches.
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ispartof Copeia, 1992-08, Vol.1992 (3), p.672-679
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1938-5110
language eng
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source JSTOR Archival Journals and Primary Sources Collection
subjects Ambystoma tigrinum
Animal and plant ecology
Animal cannibalism
Animal morphology
Animal, plant and microbial ecology
Animals
Autoecology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Jaw
Larvae
Larval development
Mouth
Phenotypic traits
Reptilia. Amphibia
Salamanders
Surgical suction
Vertebrata
Vomer
title Performance Consequences of a Trophic Polymorphism: Feeding Behavior in Typical and Cannibal Phenotypes of Ambystoma tigrinum
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