Environmental modulation of metabolic allometry in ornate rainbowfishRhadinocentrus ornatus

Biology Letters - Tập 6 Số 1 - Trang 136-138 - 2010
Fabián Vaca Chávez1, Craig R. White1
1School of Biological Sciences, The University of Queensland, St Lucia, Queensland 4072, Australia

Tóm tắt

The nature of the relationship between the metabolic rate (MR) and body mass (M) of animals has been the source of controversy for over seven decades, with much of the focus on the value of the scaling exponentb, where MR is proportional toMb. While it is well known that MR does not generally scale isometrically (i.e.bis seldom equal to 1), the value ofbremains the subject of heated debate. In the present study, we examine the influence of an ecologically relevant abiotic variable, pH, on the metabolic allometry of an Australian freshwater fish,Rhadinocentrus ornatus. We show that the value ofbis lower for rainbowfish acclimated to acidic (pH 5.0) conditions compared to rainbowfish acclimated to alkaline conditions (pH 8.5), but that acute exposure to altered pH does not alter the value ofb. This significant effect of an abiotic variable on metabolic allometry supports a growing body of evidence that there is no universal value ofband demonstrates that experimental manipulations of metabolic allometry represent powerful, and as yet underused, tools to understand the factors that constrain and influence the allometry of metabolic rate.

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Biology Letters

Tập 6 Số 1

136-138

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