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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Maximal heat dissipation capacity and hyperthermia risk: neglected key factors in the ecology of endotherms
Auteurs :	John R. Speakman, Auteur ; Elzbieta Krol, Auteur
Type de document :	Article
Dans :	Journal of Animal Ecology (79(4) JUL 2010)
Article en page(s) :	726-746
Résumé :	P>1. The role of energy in ecological processes has hitherto been considered primarily from the standpoint that energy supply is limited. That is, traditional resource-based ecological and evolutionary theories and the recent 'metabolic theory of ecology' (MTE) all assume that energetic constraints operate on the supply side of the energy balance equation. 2. For endothermic animals, we provide evidence suggesting that an upper boundary on total energy expenditure is imposed by the maximal capacity to dissipate body heat and therefore avoid the detrimental consequences of hyperthermia - the heat dissipation limit (HDL) theory. We contend that the HDL is a major constraint operating on the expenditure side of the energy balance equation, and that processes that generate heat compete and trade-off within a total boundary defined by heat dissipation capacity, rather than competing for limited energy supply. 3. The HDL theory predicts that daily energy expenditure should scale in relation to body mass (M-b) with an exponent of about 0 center dot 63. This contrasts the prediction of the MTE of an exponent of 0 center dot 75. 4. We compiled empirical data on field metabolic rate (FMR) measured by the doubly-labelled water method, and found that they scale to M-b with exponents of 0 center dot 647 in mammals and 0 center dot 658 in birds, not significantly different from the HDL prediction (P > 0 center dot 05) but lower than predicted by the MTE (P

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