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Life-history and spatial determinants of somatic growth dynamics in Komodo dragon populations

Laver, Rebecca J., Purwandana, Deni, Ariefiandy, Achmad, Imansyah, Jeri, Forsyth, David, Ciofi, Claudio and Jessop, Tim S. 2012, Life-history and spatial determinants of somatic growth dynamics in Komodo dragon populations, PLoS One, vol. 7, no. 9, Article Number : e45398, pp. 1-10, doi: 10.1371/journal.pone.0045398.

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Title Life-history and spatial determinants of somatic growth dynamics in Komodo dragon populations
Author(s) Laver, Rebecca J.
Purwandana, Deni
Ariefiandy, Achmad
Imansyah, Jeri
Forsyth, David
Ciofi, Claudio
Jessop, Tim S.
Journal name PLoS One
Volume number 7
Issue number 9
Season Article Number : e45398
Start page 1
End page 10
Total pages 10
Publisher Public Library of Science (PLOS)
Place of publication San Francisco, Calif.
Publication date 2012
ISSN 1932-6203
Summary Somatic growth patterns represent a major component of organismal fitness and may vary among sexes and populations due to genetic and environmental processes leading to profound differences in life-history and demography. This study considered the ontogenic, sex-specific and spatial dynamics of somatic growth patterns in ten populations of the world's largest lizard the Komodo dragon (Varanus komodoensis). The growth of 400 individual Komodo dragons was measured in a capture-mark-recapture study at ten sites on four islands in eastern Indonesia, from 2002 to 2010. Generalized Additive Mixed Models (GAMMs) and information-theoretic methods were used to examine how growth rates varied with size, age and sex, and across and within islands in relation to site-specific prey availability, lizard population density and inbreeding coefficients. Growth trajectories differed significantly with size and between sexes, indicating different energy allocation tactics and overall costs associated with reproduction. This leads to disparities in maximum body sizes and longevity. Spatial variation in growth was strongly supported by a curvilinear density-dependent growth model with highest growth rates occurring at intermediate population densities. Sex-specific trade-offs in growth underpin key differences in Komodo dragon life-history including evidence for high costs of reproduction in females. Further, inverse density-dependent growth may have profound effects on individual and population level processes that influence the demography of this species.
Language eng
DOI 10.1371/journal.pone.0045398
Field of Research 060801 Animal Behaviour
060603 Animal Physiology - Systems
060201 Behavioural Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2012, Public Library of Science (PLOS)
Persistent URL http://hdl.handle.net/10536/DRO/DU:30081782

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.