Increased metabolic cost of maintenance in hybrids of the stone crabs Menippe mercenaria and M. adina |
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| Authors: | C. A. Combs R. P. Henry T. M. Bert H. M. Perry M. West |
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| Affiliation: | (1) Department of Zoology and Wildlife Science, 101 Cary Hall, Auburn University, Auburn, Alabama 36849-5414, USA, US;(2) Florida Marine Research Institute, 100 Eighth Avenue SE; St. Petersburg, Florida 33701, USA, US;(3) Gulf Coast Research Laboratory, P.O. Box 7000, Ocean Springs, Mississippi 39564, USA, US;(4) Department of Resarch Data Analysis, Auburn University, Auburn, Alabama 36849, USA, US |
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| Abstract: | Three recently emerging genotype classes of the genus Menippe (M. mercenaria, M. adina, and their hybrids) were examined for potential physiological correlates of gene mixing over a salinity range of 5 to 35‰. Resting metabolic rate (RMR), as measured by oxygen uptake (V˙ O2), was highest in the hybrids. Differences in V˙ O2 could not be accounted for by differences in systemic adaptations (e.g. heart rate or scaphognathite frequency); therefore it was concluded that they were based on potential underlying differences in carbohydrate metabolism. The higher RMR in the hybrids was attributed to a higher metabolic cost of maintenance, resulting from the breakup of coadapted gene complexes as a result of introgressive hybridization. Received: 22 July 1996 / Accepted: 17 October 1996 |
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