... (Calidris canutus islandica) that assess three of these proposed mechanisms: dieting, activity and up- and down-regulation of metabolic rate. In the first experiment, knots were exposed to cues of predation risk that led them to exhibit presumably adaptive mass loss. In the second experiment, knots...

... migration protein catabolism passerine mass loss flight. It is common knowledge that the migratory flights of birds are fuelled largely by previously accumulated fat stores. However, protein is also catabolized during flight (for reviews, see Jenni and Jenni-Eiermann, 1998 ; Bauchinger...