Journal
AUSTRALIAN JOURNAL OF ZOOLOGY
Volume 59, Issue 6, Pages 416-421Publisher
CSIRO PUBLISHING
DOI: 10.1071/ZO12018
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Funding
- ARC [LP0882478]
- Australian Research Council [LP0882478] Funding Source: Australian Research Council
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We measured standard metabolic rate (SMR) and the metabolic response to feeding in the Australian crocodiles, Crocodylus porosus and C. johnsoni. Both species exhibit a response that is characterised by rapidly increasing metabolism that peaks within 24 h of feeding, a postfeeding metabolic peak (peak (V) over dot(O2)) of 1.4-2.0 times SMR, and a return to baseline metabolism within 3-4 days after feeding. Postfeeding metabolism does not significantly differ between species, and crocodiles fed intact meals have higher total digestive costs (specific dynamic action; SDA) than those fed homogenised meals. Across a more than 100-fold range of body size (0.190 to 25.96 kg body mass), SMR, peak (V) over dot(O2), and SDA all scale with body mass to an exponent of 0.85. Hatchling (<= 1 year old) C. porosus have unexpectedly high rates of resting metabolism, and this likely reflects the substantial energetic demands that accompany the rapid growth of young crocodilians.
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