Phenotype manipulations confirm the role of pectoral muscles and haematocrit in avian maximal thermogenic capacity.

Abstract excerpt

In small resident bird species living at northern latitudes, winter cold acclimatization is associated with an increase in pectoral muscle size and haematocrit level, and this is thought to drive the seasonal increase in summit metabolic rate (Msum, a measure of maximal shivering thermogenic capacity). However, evidence suggesting that pectoral muscle size influences Msum is correlational and the link between...

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