2023-03-14 ワシントン大学セントルイス校
A greenish puffleg (Haplophaedia aureliae) (on left) and two male booted racket-tails (Ocreatus underwoodii) are seen at La Minga Ecolodge, Valle del Cauca, Colombia.(Photos: Juan Fernando Pinillos Madrid).
新しい研究によると、ハチドリは体調と環境に応じてトルーパーを異なる方法で使用し、深いトルーパー、浅いトルーパー、トルーパーの維持時間、トルーパーからの回復方法などを調整できる。
また、トルーパーは、高地での寒さに耐えるために必要不可欠であり、ハチドリの進化と高地への侵入に貢献した可能性がある。
<関連情報>
- https://source.wustl.edu/2023/03/hummingbirds-use-torpor-in-varying-ways-to-survive-cold-temps/
- https://royalsocietypublishing.org/doi/10.1098/rspb.2022.2099
アンデスハチドリにおけるトルーパーの生態学的要因と結果 Ecological drivers and consequences of torpor in Andean hummingbirds
Diana Carolina Revelo Hernández,Justin W. Baldwin and Gustavo A. Londoño
Proceedings of the Royal Society B Published:15 March 2023
DOI:https://doi.org/10.1098/rspb.2022.2099
Abstract
Daily torpor allows endotherms to save energy during energetically stressful (e.g. cold) conditions. Although studies on avian torpor have mostly been conducted under laboratory conditions, information on the usage of torpor in the wild is limited to few, predominantly temperate-zone species. We studied torpor under seminatural conditions from 249 individuals from 29 hummingbird species across a 1920 m elevational gradient in the western Andes of Colombia using cloacal thermistors. Small birds were more likely to use torpor than large birds, but only at low ambient temperatures, where torpor was prolonged. We also found effects of proxy variables for body condition and energy expenditure on the use of torpor, its characteristics, and impacts. Our results suggest that context-dependency and phylogenetic variation in the probability of deploying torpor can help understand clade-wide patterns of elevational distribution in Andean hummingbirds.
