Ecological drivers and consequences of torpor in Andean hummingbirds.
Proc Biol Sci
; 290(1995): 20222099, 2023 03 29.
Article
em En
| MEDLINE
| ID: mdl-36919431
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.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Aves
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Metabolismo Energético
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Torpor
Limite:
Animals
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Humans
País como assunto:
America do sul
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Colombia
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article