ArticleJournal of comparative physiology. B, Biochemical, systemic, and environmental physiology2026
Nomadic songbirds achieve rapid increases in thermogenic capacity during cold acclimation while maintaining low corticosterone.
Article in Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Migrating animals can track resources to maximize energy intake, but moving may also expose them to rapid changes in weather that require thermogenic defense. The Migratory Flexibility Hypothesis predicts that migrants exposed to variable conditions may need to be more flexible in thermogenic response. Here, we investigate metabolic flexibility of the red crossbill (Loxia curvirostra), an altitudinal and latitudinal nomad that experiences wide variability in climate, to determine how flexibility in migration relates to thermogenic flexibility. Two ecotypes of captive red crossbill (Type 3 and Type 5) that vary in degree of nomadism were transferred to thermoneutral (21 °C) or cold (6 °C) temperatures during their spring migratory period. Metabolic rates and baseline corticosterone levels were repeatedly measured across nine days during acclimation. Both ecotypes of red crossbill showed the fastest increase in thermogenic capacity (M
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