The ontogeny of functional design: metamorphosis of feeding behaviour in the tiger salamander (Ambystoma tigrinum)

H. B. SHAFFER,

H. B. SHAFFER

Department of Ecology and Evolution

*Department of Zoology, University of California, Davis, California 95616 USA

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G. V. LAUDER,

G. V. LAUDER

Department of Ecology and Evolution

Department of Developmental and Cell Biology, University of California, Irvine, California 92717, USA

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H. B. SHAFFER,

H. B. SHAFFER

Department of Ecology and Evolution

*Department of Zoology, University of California, Davis, California 95616 USA

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G. V. LAUDER,

G. V. LAUDER

Department of Ecology and Evolution

Department of Developmental and Cell Biology, University of California, Irvine, California 92717, USA

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First published: November 1988

https://doi.org/10.1111/j.1469-7998.1988.tb02440.x

Citations: 46

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Abstract

The ontogeny of feeding behaviour was studied quantitatively in the tiger salamander, Ambystoma tigrinum, to elucidate the relative importance of morphological and environmental changes on form and function. High-speed films of prey capture provided data for a frame-by-frame analysis of seven kinematic parameters of feeding behaviour. By comparing underwater feeding of larval and metamorphosed individuals, the effect of morphological changes occurring at metamorphosis on the feeding kinematic pattern was determined. By comparing metamorphosed animals feeding in the water and on land, changes in feeding kinematics associated with the environmental transition (and thus the differing physical properties of water and air) were determined. Both univariate and multivariate analyses failed to demonstrate any differences between larval and metamorphosed aquatic feedings for seven kinematic variables. However, when individuals feed on land, a radical shift in hyoid kinematics was observed. In addition, multivariate analysis showed that terrestrial feedings differed from aquatic feedings in having longer duration head movements. The lack of a kinematic difference between larval and metamorphosed individuals feeding in the water indicates that the morphological changes occurring at metamorphosis do not impose any obligatory kinematic consequences. Rather, metamorphosed Ambystoma tigrinum acquire the ability to modulate their kinematic pattern depending on the environment.

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Volume216, Issue3

November 1988

Pages 437-454

The ontogeny of functional design: metamorphosis of feeding behaviour in the tiger salamander (Ambystoma tigrinum)

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The ontogeny of functional design: metamorphosis of feeding behaviour in the tiger salamander (Ambystoma tigrinum)

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