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Proc Biol Sci. 2009 Jun 7;276(1664):1939-48. doi: 10.1098/rspb.2008.1957. Epub 2009 Mar 4.

Why tropical forest lizards are vulnerable to climate warming.

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1
Department of Biology, University of Washington, PO Box 351800, Seattle, WA 98195, USA. hueyrb@u.washington.edu

Abstract

Biological impacts of climate warming are predicted to increase with latitude, paralleling increases in warming. However, the magnitude of impacts depends not only on the degree of warming but also on the number of species at risk, their physiological sensitivity to warming and their options for behavioural and physiological compensation. Lizards are useful for evaluating risks of warming because their thermal biology is well studied. We conducted macrophysiological analyses of diurnal lizards from diverse latitudes plus focal species analyses of Puerto Rican Anolis and Sphaerodactyus. Although tropical lowland lizards live in environments that are warm all year, macrophysiological analyses indicate that some tropical lineages (thermoconformers that live in forests) are active at low body temperature and are intolerant of warm temperatures. Focal species analyses show that some tropical forest lizards were already experiencing stressful body temperatures in summer when studied several decades ago. Simulations suggest that warming will not only further depress their physiological performance in summer, but will also enable warm-adapted, open-habitat competitors and predators to invade forests. Forest lizards are key components of tropical ecosystems, but appear vulnerable to the cascading physiological and ecological effects of climate warming, even though rates of tropical warming may be relatively low.

PMID:
19324762
PMCID:
PMC2677251
DOI:
10.1098/rspb.2008.1957
[Indexed for MEDLINE]
Free PMC Article
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