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The Journal of Experimental Biology 205, 1031-1036 (2002)
© 2002 The Company of Biologists Limited

Relationship between individual variation in morphological characters and swimming costs in brook charr (Salvelinus fontinalis) and yellow perch (Perca flavescens)

Patrice Boily* and Pierre Magnan

Département de chimie-biologie, Université du Québec à Trois-Rivières, CP 500, Trois-Rivières (Québec) G9A 5H7, Canada

* Author for correspondence at present address: Department of Biological Sciences, University of New Orleans, New Orleans, LA 70148, USA (e-mail: pboily{at}uno.edu )

Accepted 14 January 2002

The objective of this study was to examine if individual variation in morphological characters is related to swimming costs in wild and domestic brook charr, and in wild yellow perch. Our results indicate that absolute swimming cost was higher in wild and domestic brook charr individuals having a stout body shape, and these individuals are therefore less efficient swimmers. These results are consistent with field observations that described relationships between individual variation in morphology and habitat use in salmonids. Further analyses indicated that standard metabolic rates were higher in individuals having a stout body shape, and that net swimming cost was not related to body shape. Accordingly, the higher swimming cost of stout individuals is probably an indirect consequence of an increase in standard metabolic rate. In wild yellow perch, absolute and net swimming costs were higher in individuals having a stout body shape and a low aspect caudal fin, and standard metabolic rate was not related to body shape. Therefore, in contrast to brook charr, individual variation in the swimming cost of yellow perch appears to be related to morphological characters that affect drag and thrust forces, which is consistent with previously published inter-specific observations.

Key words: brook charr, Salvelinus fontinalis, yellow perch, Perca flavescens, swimming cost, standard metabolic rate, morphology, body shape




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© The Company of Biologists Ltd 2002