Metabolic correlates of burst swimming capacity of juvenile and adult threespine stickleback (Gasterosteus aculeatus) |
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Authors: | C Garenc P Couture M-A Laflamme H Guderley |
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Institution: | (1) Département de biologie, Université Laval, Québec, PQ, G1K 7P4, Canada, CA |
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Abstract: | The relationship between burst swimming performance and muscle metabolic capacities was examined in juvenile and adult threespine
sticklebacks (Gasterosteus aculeatus). The absolute burst speed measured during startle responses increased markedly with growth of juveniles, but this positive
allometry did not continue in adults. The allometry of phosphofructokinase (PFK), lactate dehydrogenase, creatine phosphokinase
activities and protein concentrations was positive in juveniles and became negative in adults. The lower activities in adults
may reflect the mobilization of muscle proteins for reproduction. In juveniles, absolute burst swimming and muscle glycolytic
capacity show a similar allometry. However, when the influence of factors such as size and age was removed by calculating
residuals from multiple regressions, variation in muscle enzyme activities in juveniles did not explain variation in their
swimming capacity. In adults, interindividual variation in PFK and cytochrome C oxidase activities was correlated with variation
in the burst swimming capacity. Apparently, mobilization of muscle proteins in support of reproduction may lead muscle enzyme
levels to limit burst performance.
Accepted: 9 November 1998 |
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Keywords: | Burst swimming Allometry Metabolic capacities Stickleback Fish |
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