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American Zoologist 1998 38(1):152-165; doi:10.1093/icb/38.1.152
© 1998 by The Society for Integrative and Comparative Biology
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Sexual Strategy and Size Dimorphism in Rattlesnakes: Integrating Proximate and Ultimate Causation1

DAVID DUVALL*,2 and EVEN J. BEAUPRE{dagger}
*Department of Zoology, Oklahoma State University Stillwater, Oklahoma 74078
{dagger}Department of Biological Sciences, University of Arkansas Fayetteville, Arkansas 72701

Correspondence: 2E-mail:duvalld{at}okway.okstate.edu

SYNOPSIS. Integrating proximate and ultimate causes and effects simultaneously in the study of behavior is challenging and complex, but useful. This is equivalent to asking both "How?" (in the sense of proximate mechanisms) and "Why?" (in the sense of ultimate evolutionary payoffs) an organism operates in one way and not another. Sex differences in rattlesnake (i) size and growth and (ii) mating and reproductive strategies and tactics, provide a good theoretical and empirical context in which to attempt such integration. We employ interdisciplinary and multidisciplinary approaches in our behavioral and physiological work, but we mean something different by "integrative," that amounts to the simultaneous study of both proximate and ultimate levels of causation and explanation. Though not always feasible, this approach represents an important goal to work towards because it attempts to represent faithfully the complexity inherent in living systems. To this end, we also employ a variety of modeling approaches, which entrain intuition, generate new hypotheses, and sharpen inference. Individual-based simulations, for example, offer promise for broad, integrative programs of biological research.


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