期刊
BIOLOGY LETTERS
卷 16, 期 9, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rsbl.2020.0428
关键词
body temperature; evolution; heterothermy; hypometabolism; thermoregulation; Trochilidae
资金
- National Science Foundation [DEB 1146491, IOS 1122228]
- National Research Foundation [119754]
Torpor is thought to be particularly important for small endotherms occupying cold environments and with limited fat reserves to fuel metabolism, yet among birds deep torpor is both rare and variable in extent. We investigated torpor in hummingbirds at approximately 3800 m.a.s.l. in the tropical Andes by monitoring body temperature (T-b) in 26 individuals of six species held captive overnight and experiencing natural air temperature (T-a) patterns. All species used pronounced torpor, with oneMetallura phoebereaching a minimumT(b)of 3.26 degrees C, the lowest yet reported for any bird or non-hibernating mammal. The extent and duration of torpor varied among species, with overnight body mass (M-b) loss negatively correlated with both minimumT(b)and bout duration. We found a significant phylogenetic signal for minimumT(b)and overnightM(b)loss, consistent with evolutionarily conserved thermoregulatory traits. Our findings suggest deep torpor is routine for high Andean hummingbirds, but evolved species differences affect its depth.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据