Author:
Withers P. C.,Aplin K. P.,Werner Y. L.
Abstract
Resting metabolic rate (RMR) and evaporative water loss (EWL) were measured,
and resistance (R) to evaporative water loss and water use index (WUI =
EWL/RMR) were calculated, for 22 species of Western Australian gecko. For
all available gecko data, body mass and temperature explained 85% of
the variability in RMR (=14.5 mass0.833
100.0398 Ta µL h–1),
and 70% of the variability in EWL (=0.126
mass0.539 100.049 Ta mg
h–1 ). For Western Australian geckos, RMR and EWL
were significantly influenced by body mass, using conventional regression and
phylogenetic analyses. Resistance to evaporative water loss (R) was not
significantly affected by body mass. Water use index was inversely related to
body mass: WUI = 21.9 M–0.344 mg mL
O2–1. There were significant
differences between species for R and for standardised residuals of RMR, EWL
and WUI. R was not correlated with phylogeny, and was significantly higher
(P = 0.020) for saxicolous geckos (1467 s
cm-1) than terrestrial geckos (797 s
cm–1); arboreal geckos had an intermediate R (977
s cm–1). Species that ate termites had lower
standardised linear regression residuals (P =
0.003) for RMR than did species that ate more general diets. Standardised
residuals for EWL were almost significantly related to microhabitat
(P = 0.053). Standardised residuals for WUI were
significantly related to microhabitat (P =
0.016); saxicolous species had lower WUI than terrestrial species.
Standardised linear regression residuals of the residuals from autoregression
(which should be independent of both mass and phylogeny effects) still
significantly correlated RMR and diet, but not EWL or WUI with microhabitat.
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Cited by
10 articles.
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