Geographical variation in body size and sexual size dimorphism in an Australian lizard, Boulenger's Skink (Morethia boulengeri)

Damian R. Michael, Sam C. Banks, Maxine P. Piggott, Ross B. Cunningham, Mason Crane, Christopher MacGregor, Lachlan McBurney, David B. Lindenmayer

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Abstract

Ecogeographical rules help explain spatial and temporal patterns in intraspecific body size. However, many of these rules, when applied to ectothermic organisms such as reptiles, are controversial and require further investigation. To explore factors that influence body size in reptiles, we performed a heuristic study to examine body size variation in an Australian lizard, Boulenger's Skink Morethia boulengeri from agricultural landscapes in southern New South Wales, south-eastern Australia. We collected tissue and morphological data on 337 adult lizards across a broad elevation and climate gradient. We used a model-selection procedure to determine if environmental or ecological variables best explained body size variation. We explored the relationship between morphology and phylogenetic structure before modeling candidate variables from four broad domains: (1) geography (latitude, longitude and elevation), (2) climate (temperature and rainfall), (3) habitat (vegetation type, number of logs and ground cover attributes), and (4) management (land use and grazing history). Broad phylogenetic structure was evident, but on a scale larger than our study area. Lizards were sexually dimorphic, whereby females had longer snout-vent length than males, providing support for the fecundity selection hypothesis. Body size variation in M. boulengeri was correlated with temperature and rainfall, a pattern consistent with larger individuals occupying cooler and more productive parts of the landscape. Climate change forecasts, which predict warmer temperature and increased aridity, may result in reduced lizard biomass and decoupling of trophic interactions with potential implications for community organization and ecosystem function.

Original languageEnglish
Article numbere109830
Pages (from-to)1-8
Number of pages8
JournalPLoS One
Volume9
Issue number10
DOIs
Publication statusPublished - 22 Oct 2014
Externally publishedYes

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Lizards
Scincidae
Body Size
dimorphism
geographical variation
Sex Characteristics
lizards
body size
Rain
Reptiles
Climate
Vents
reptiles
Temperature
Ecosystem
Land use
Climate change
Ecosystems
Biomass
climate

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Michael, D. R., Banks, S. C., Piggott, M. P., Cunningham, R. B., Crane, M., MacGregor, C., ... Lindenmayer, D. B. (2014). Geographical variation in body size and sexual size dimorphism in an Australian lizard, Boulenger's Skink (Morethia boulengeri). PLoS One, 9(10), 1-8. [e109830]. https://doi.org/10.1371/journal.pone.0109830
Michael, Damian R. ; Banks, Sam C. ; Piggott, Maxine P. ; Cunningham, Ross B. ; Crane, Mason ; MacGregor, Christopher ; McBurney, Lachlan ; Lindenmayer, David B. / Geographical variation in body size and sexual size dimorphism in an Australian lizard, Boulenger's Skink (Morethia boulengeri). In: PLoS One. 2014 ; Vol. 9, No. 10. pp. 1-8.
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abstract = "Ecogeographical rules help explain spatial and temporal patterns in intraspecific body size. However, many of these rules, when applied to ectothermic organisms such as reptiles, are controversial and require further investigation. To explore factors that influence body size in reptiles, we performed a heuristic study to examine body size variation in an Australian lizard, Boulenger's Skink Morethia boulengeri from agricultural landscapes in southern New South Wales, south-eastern Australia. We collected tissue and morphological data on 337 adult lizards across a broad elevation and climate gradient. We used a model-selection procedure to determine if environmental or ecological variables best explained body size variation. We explored the relationship between morphology and phylogenetic structure before modeling candidate variables from four broad domains: (1) geography (latitude, longitude and elevation), (2) climate (temperature and rainfall), (3) habitat (vegetation type, number of logs and ground cover attributes), and (4) management (land use and grazing history). Broad phylogenetic structure was evident, but on a scale larger than our study area. Lizards were sexually dimorphic, whereby females had longer snout-vent length than males, providing support for the fecundity selection hypothesis. Body size variation in M. boulengeri was correlated with temperature and rainfall, a pattern consistent with larger individuals occupying cooler and more productive parts of the landscape. Climate change forecasts, which predict warmer temperature and increased aridity, may result in reduced lizard biomass and decoupling of trophic interactions with potential implications for community organization and ecosystem function.",
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Michael, DR, Banks, SC, Piggott, MP, Cunningham, RB, Crane, M, MacGregor, C, McBurney, L & Lindenmayer, DB 2014, 'Geographical variation in body size and sexual size dimorphism in an Australian lizard, Boulenger's Skink (Morethia boulengeri)', PLoS One, vol. 9, no. 10, e109830, pp. 1-8. https://doi.org/10.1371/journal.pone.0109830

Geographical variation in body size and sexual size dimorphism in an Australian lizard, Boulenger's Skink (Morethia boulengeri). / Michael, Damian R.; Banks, Sam C.; Piggott, Maxine P.; Cunningham, Ross B.; Crane, Mason; MacGregor, Christopher; McBurney, Lachlan; Lindenmayer, David B.

In: PLoS One, Vol. 9, No. 10, e109830, 22.10.2014, p. 1-8.

Research output: Contribution to journalArticleResearchpeer-review

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