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The Journal of Experimental Biology 205, 2909-2914 (2002)
© 2002 The Company of Biologists Limited

Energy metabolism of male and female tarantulas (Aphonopelma anax) during locomotion

Cara Shillington* and Charles C. Peterson

Department of Zoology, Oklahoma State University, Stillwater, OK 74078-3052, USA

* Author for correspondence at present address: Department of Biology, 316 Mark Jefferson, Eastern Michigan University, Ypsilanti, MI 48197, USA (e-mail: cara.shillington{at}emich.edu)

Accepted 14 June 2002

We examined aerobic performance traits in male and female tarantulas (Aphonopelma anax). Reproductive fitness in these males relies heavily on locomotory searching to locate receptive females, which are fossorial and sedentary. Because of this dimorphism in life history, we predicted that selection in males would enhance their ability to sustain high levels of aerobic metabolism (compared with females) to support increased locomotory activity during the mating season. Rates of carbon dioxide production were measured in an enclosed variable-speed treadmill. Steady-state rates of carbon dioxide production increased linearly within the range of sustainable aerobic speeds for both males and females. Although there was substantial variation in physiological performance traits among individuals, there were no detectable intersexual differences in maximal rates of carbon dioxide production, maximal aerobic speed, minimum transport or factorial scope.

Key words: tarantula, Aphonopelma anax, aerobic metabolism, performance traits, sexual dimorphism


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© The Company of Biologists Ltd 2002