Phenotypic Flexibility of Metabolic Rate and Evaporative Water Loss Does Not Vary Across a Climatic Gradient in an Afrotropical Passerine Bird

Fresh from the Journal of Experimental Biology (JEB), here is an interesting Bio article that Lab.Equipment has sourced for you:

Matthew J. Noakes and Andrew E. McKechnie

Small birds inhabiting northern temperate and boreal latitudes typically increase metabolic rates during cold winters or acclimation to low air temperatures (T_accl). Recent studies suggest considerable variation in patterns of seasonal metabolic acclimatization in birds from subtropical and tropical regions with milder winters, but there remains a dearth of acclimation studies investigating metabolic flexibility among lower-latitude birds. We used short-term thermal acclimation experiments to investigate phenotypic flexibility in basal metabolic rate (BMR), thermoneutral evaporative water loss (EWL) and summit metabolism (M_sum) in three populations of white-browed sparrow-weavers (Plocepasser mahali) along a climatic and aridity gradient. We allocated individuals to one of three T_accl treatments (5, 20 and 35°C; n=11 per population per T_accl)... You can find the full article in the Journal of Experimental Biology (JEB) Blog.

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