Slow pace of life in tropical sedentary birds:a common-garden experiment on four stonechatpopulations from different latitudes

It has been hypothesized that organisms living at different latitudes or in different environments adjust their metabolic activity to the prevailing conditions. However, do differences in energy turnover simply represent a phenotypic adaptation to the local environment, or are they genetically based?

Martin Wikelski, Proc. R. Soc. Lond. B (2003) 270, 2383-2388