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Migratory birds on wintering grounds in tropics have a higher basal metabolic rate than tropical residentsстатья Исследовательская статья
- Авторы: Bushuev Andrey V., Tolstenkov Oleg O., Palko Igor V., Pacioni Cesare, Strubbe Diederik, Lens Luc, Sentís Marina, Nguyễn Linh Văn, Nguyễn Vân Thị, Kerimov Anvar B.
- Журнал: Ecological and Evolutionary Physiology
- Год издания: 2025
- Издательство: University of Chicago Press
- Местоположение издательства: United States
- DOI: 10.1086/737777
- Аннотация: Long-distance endurance flight in migratory birds requires numerous physiological adaptations. Maintaining the necessary physiological machinery may require increased energy expenditure, which could manifest as an elevated basal metabolic rate (BMR). Comparing the BMR of long-distance migrants and residents using global BMR datasets is complicated by the fact that data for migrants typically come from higher latitudes and colder regions than those for non-migrants. Separating the effects of ambient temperature (Ta) and migratory tendency on BMR is challenging due to the well-documented high phenotypic plasticity of avian BMR, which is reflected in the negative relationship between BMR and Ta. We hypothesized that tropical migrants would have a higher BMR than residents due to the cost of maintaining a more enduring and/or flexible physiology. Additionally, according to the Climatic Variability Hypothesis (CVH), BMR plasticity should be greater in regions with more variable climates. To test these hypotheses, we measured BMR in 130 sedentary and 25 migratory species from two remote areas in Vietnam that differ in climate. As expected, we found that in both sites, migrants on their wintering grounds maintained a higher mass-independent BMR compared to tropical residents. Moreover, the BMR of wintering migrants was not lower than their BMR on their breeding grounds. Sedentary species inhabiting a milder and more stable climate had lower BMR than those in colder and more variable environments. The individual long-term repeatability of BMR in the milder climate was higher than that in the area with a more variable climate, which is consistent with the CVH.
- Добавил в систему: Бушуев Андрей Владимирович