SREL Reprint #2465

 

 

 

Interaction of sex and size and the standard metabolic rate of paedomorphic Ambystoma talpoideum: size does matter

Travis J. Ryan1,2 and William A. Hopkins1,3

1University of Georgia's Savannah River Ecology Laboratory, Drawer E, Aiken, SC 29802
2Division of Biological Sciences, University of Missouri, Columbia, MO 65211
3Division of Biological Sciences, University of South Carolina, Columbia, SC 29208

Abstract: We measured the standard metabolic rate of paedomorphic Mole Salamanders (Ambystoma talpoideum) from South Carolina. Despite an absence of body size differences between females and males, analysis of covariance demonstrated metabolic rates (mL O2/h) were significantly influenced by an interaction between sex and body size. The interaction appeared as a result of changes in the size-metabolism relationship in males (a steeper slope in the size-metabolism regression in small males as compared to large males), whereas the relationship remained constant in females, regardless of size. We hypothesize that the observed differences are attributable to differences in reproductive physiology between the sexes. The results of this study underscore the need to evaluate the potential interactions among relevant variables in studies of metabolism, which heretofore have been disregarded in studies of salamander physiology.

SREL Reprint #2465

Ryan, T. J. and W. A. Hopkins. 2000. Interaction of sex and size and the standard metabolic rate of paedomorphic Ambystoma talpoideum: size does matter. Copeia 3:808-812.

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