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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| Institution: | (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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