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Scaling of standard metabolic rate in estuarine crocodiles Crocodylus porosus |
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| Authors: | Roger S Seymour C M Gienger Matthew L Brien Christopher R Tracy S Charlie Manolis Grahame J W Webb Keith A Christian |
| Institution: | 1. School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA, 5005, Australia 2. Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT, 0909, Australia 4. Department of Biology and Center of Excellence for Field Biology, Austin Peay State University, Clarksville, TN, 37044, USA 3. Wildlife Management International and Crocodylus Park, Berrimah, NT, 0828, Australia 5. Department of Biological Science, California State University, Fullerton, CA, 92834, USA |
| Abstract: | Standard metabolic rate (SMR, ml O2 min?1) of captive Crocodylus porosus at 30 °C scales with body mass (kg) according to the equation, SMR = 1.01 M0.829, in animals ranging in body mass of 3.3 orders of magnitude (0.19–389 kg). The exponent is significantly higher than 0.75, so does not conform to quarter-power scaling theory, but rather is likely an emergent property with no single explanation. SMR at 1 kg body mass is similar to the literature for C. porosus and for alligators. The high exponent is not related to feeding, growth, or obesity of captive animals. The log-transformed data appear slightly curved, mainly because SMR is somewhat low in many of the largest animals (291–389 kg). A 3-parameter model is scarcely different from the linear one, but reveals a declining exponent between 0.862 and 0.798. A non-linear model on arithmetic axes overestimates SMR in 70 % of the smallest animals and does not satisfactorily represent the data. |
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