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• W1606802178 abstract "The thermoregulatory capacity and metabolic responses to light–dark cycles under various mild food-deprivation treatments were measured in Bronze Mannikins Spermestes cucullatus (10–11 g). We measured the response of minimum oxygen consumption to ambient temperature in order to determine the basal metabolic rate (BMR), thermal conductance and limits of thermoneutrality of the Mannikins. In addition, we measured oxygen consumption in response to light–dark cycles and three mild food-deprivation treatments. Bronze Mannikins have a low BMR (1.67 mlO2/g/h) that is c. 50–60% of that predicted from phylogenetically independent allometric curves for all birds. A low BMR resulted in amplitudes of metabolism between the active and rest phases that were double those predicted allometrically from body mass. The reduced nocturnal metabolic rate did not represent torpor. Typically, Mannikins would need to reduce their metabolic rate during the rest phase to c. 17% of BMR to attain the average torpor metabolic rate of other birds. The data are, however, consistent with those of other group-living Afrotropical birds that benefit energetically from group huddling in environments in which moderate seasonality is accompanied by unpredictable climates – and thus unpredictable energy inputs in time and space. When food-deprived and placed under moderate cold stress (20 °C), Mannikins decreased their rest-phase metabolic rates to the same magnitude as several small Holarctic birds. We suggest that, in the context of the progress made to quantify and define proximate heterothermic responses in endotherms, such as torpor and hibernation, the term nocturnal hypothermia often applied to moderate nocturnal reductions in metabolic rate is vague, misleading and inappropriate." @default.
• W1606802178 created "2016-06-24" @default.
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• W1606802178 date "2003-10-01" @default.
• W1606802178 modified "2023-09-26" @default.
• W1606802178 title "Is ‘nocturnal hypothermia’ a valid physiological concept in small birds?: a study on Bronze Mannikins Spermestes cucullatus" @default.
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• W1606802178 doi "https://doi.org/10.1046/j.1474-919x.2003.00166.x" @default.
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