Mass‐independent urn:x-wiley:00301299:media:oik12892:oik12892-math-0002 was 13.6% lower in goslings from the sedentary colony than in goslings from the migratory colony. Similarly, in adult geese, mass‐independent urn:x-wiley:00301299:media:oik12892:oik12892-math-0003 was 15.5% lower in sedentary than in migratory conspecifics. Goslings in the Netherlands grew 36.2% slower than goslings in Russia, while we found no differences in body dimensions in adults. Adult geese from both colonies commenced wing moult with similar body stores, but whereas Russian barnacle geese maintained this level throughout moult, body stores in geese from the Netherlands fell, being 8.5% lower half‐way through the moult.
We propose that the colony differences in resting metabolic rate, growth rate and body mass dynamics during moult can be explained by environmental and behavioural differences. The less stringent time constraints combined with poorer foraging opportunities allow for a smaller ‘metabolic machinery’ in non‐migratory geese. Our analysis suggests that range expansion may be associated with changes in physiology, especially when paired with changes in migratory tendency.
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Data from: Resting metabolic rate in migratory and non-migratory geese following range expansion; go south, go low
Eichhorn, G. (Creator), Enstipp, M. R. (Creator), Georges, J. (Creator), Hasselquist, D. (Creator) & Nolet, B. A. (Creator), Dryad, 24 May 2019