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Growth dynamics of freshwater crocodiles ( Crocodylus johnstoni ) in the Lynd River, Queensland

Growth dynamics of freshwater crocodiles ( Crocodylus johnstoni ) in the Lynd River, Queensland We analysed growth models for a population of Australian freshwater crocodiles ( Crocodylus johnstoni ). Competing growth models were tested with two data sets: individuals of known-age, and growth interval data from capture-recapture records. A von Bertalanffy function provided the best empirical fit of several growth models. The estimated asymptotic lengths (snout–vent length of males = 125.3 cm; females = 97.4 cm) agreed well with average lengths of the ten largest males and females in the population. Sexual size dimorphism in this species resulted from a combination of smaller mean length at maturity for females and a subsequent decline in female growth rate. Size dimorphism may result from individual trade-offs in age v. length at maturity as a consequence of sexual selection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Australian Journal of Zoology CSIRO Publishing

Growth dynamics of freshwater crocodiles ( Crocodylus johnstoni ) in the Lynd River, Queensland

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Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
0004-959X
eISSN
1446-5698
DOI
10.1071/ZO06099
Publisher site
See Article on Publisher Site

Abstract

We analysed growth models for a population of Australian freshwater crocodiles ( Crocodylus johnstoni ). Competing growth models were tested with two data sets: individuals of known-age, and growth interval data from capture-recapture records. A von Bertalanffy function provided the best empirical fit of several growth models. The estimated asymptotic lengths (snout–vent length of males = 125.3 cm; females = 97.4 cm) agreed well with average lengths of the ten largest males and females in the population. Sexual size dimorphism in this species resulted from a combination of smaller mean length at maturity for females and a subsequent decline in female growth rate. Size dimorphism may result from individual trade-offs in age v. length at maturity as a consequence of sexual selection.

Journal

Australian Journal of Zoology – CSIRO Publishing

Published: Jan 9, 2007

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