Does greater thermal plasticity facilitate range expansion of an invasive terrestrial anuran into higher latitudes?

Winwood-Smith, Hugh S., Alton, Lesley A., Franklin, Craig E. and White, Craig R. (2015) Does greater thermal plasticity facilitate range expansion of an invasive terrestrial anuran into higher latitudes?. Conservation Physiology, 3 1: 1-11. doi:10.1093/conphys/cov010


Author Winwood-Smith, Hugh S.
Alton, Lesley A.
Franklin, Craig E.
White, Craig R.
Title Does greater thermal plasticity facilitate range expansion of an invasive terrestrial anuran into higher latitudes?
Journal name Conservation Physiology   Check publisher's open access policy
ISSN 2051-1434
Publication date 2015-12
Sub-type Article (original research)
DOI 10.1093/conphys/cov010
Open Access Status DOI
Volume 3
Issue 1
Start page 1
End page 11
Total pages 11
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2016
Language eng
Abstract Temperature has pervasive effects on physiological processes and is critical in setting species distribution limits. Since invading Australia, cane toads have spread rapidly across low latitudes, but slowly into higher latitudes. Low temperature is the likely factor limiting high-latitude advancement. Several previous attempts have been made to predict future cane toad distributions in Australia, but understanding the potential contribution of phenotypic plasticity and adaptation to future range expansion remains challenging. Previous research demonstrates the considerable thermal metabolic plasticity of the cane toad, but suggests limited thermal plasticity of locomotor performance. Additionally, the oxygen-limited thermal tolerance hypothesis predicts that reduced aerobic scope sets thermal limits for ectotherm performance. Metabolic plasticity, locomotor performance and aerobic scope are therefore predicted targets of natural selection as cane toads invade colder regions. We measured these traits at temperatures of 10, 15, 22.5 and 30°C in low- and high-latitude toads acclimated to 15 and 30°C, to test the hypothesis that cane toads have adapted to cooler temperatures. High-latitude toads show increased metabolic plasticity and higher resting metabolic rates at lower temperatures. Burst locomotor performance was worse for high-latitude toads. Other traits showed no regional differences. We conclude that increased metabolic plasticity may facilitate invasion into higher latitudes by maintaining critical physiological functions at lower temperatures.
Keyword Aerobic scope
Cane toad
Invasive species
Metabolic rate
Rhinella marina
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Biological Sciences Publications
 
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Created: Thu, 24 Mar 2016, 11:54:09 EST by Gail Walter on behalf of School of Biological Sciences