Great tits (Parus major) in a west European temperate forest show little seasonal variation in metabolic energy requirements

Pacioni, C.; Sentís, M.; Hambly, C.; Speakman, J.R.; Kerimov, A.; Bushuev, A.; Lens, L.; Strubbe, D.

Авторы: Pacioni Cesare, Sentís Marina, Hambly Catherine, Speakman John R., Kerimov Anvar, Bushuev Andrey, Lens Luc, Strubbe Diederik
Журнал: Journal of Thermal Biology
Год издания: 2023
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Номер статьи: 103748
DOI: 10.1016/j.jtherbio.2023.103748
Аннотация: Understanding how birds annually allocate energy to cope with changing environmental conditions and physiological states is a crucial question in avian ecology. There are several hypotheses to explain species' energy allocation. One prominent hypothesis suggests higher energy expenditure in winter due to increased thermoregulatory costs. The "reallocation" hypothesis suggests no net difference in seasonal energy requirements, while the "increased demand" hypothesis predicts higher energy requirements during the breeding season. Birds are expected to adjust their mass and/or metabolic intensity in ways that are consistent with their energy requirements. Here, we look for metabolic signatures of seasonal variation in energy requirements of a resident passerine of a temperate-zone (great tit, Parus major). To do so, we measured whole-body and mass-independent basal (BMR), summit (Msum), and field (FMR) metabolic rates during late winter and during breeding in Belgian great tits. During the breeding season, birds had on average 10% higher whole-body BMR and FMR compared to winter, while their Msum decreased by 7% from winter to breeding. Mass-independent metabolic rates showed a 10% increase in BMR and a 7% decrease in Msum from winter to breeding. Whole-body BMR was correlated with Msum, but this relationship did not hold for mass-independent metabolic rates. The modest seasonal change we observed suggest that great tits in our temperature study area maintain a largely stable energy budget throughout the year, which appears mostly consistent with the reallocation hypothesis.
Добавил в систему: Бушуев Андрей Владимирович

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