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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The wing morphology traits of resident birds that spend a large amount of time per day flying are similar to those of migrant birds (2021)
Auteurs :	Steven W. Evans, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (162(3) July, 2021)
Article en page(s) :	765-778
Langues:	Anglais
Résumé :	The distances covered by migrant birds have been the subject of many studies. There are no estimates of the distances travelled by resident birds spending different amounts of time per day flying. Selection pressures similar to those due to migration are hypothesised to select for high aspect ratio wings, with low wing loading, among resident birds that spend a large amount of time per day flying. This reduces the energetic cost of flying and increases the birds’ flight range. The estimated distances that aerial foraging birds fly per day (n = 4 species), and per year (n = 3 species) ranged from 83 to 215 km, and from 38,666 to 44,716 km, respectively. To test the abovementioned hypothesis, the phylogenetically controlled and mass-adjusted wingspan, mean wing chord, wing area, wing loading and wing aspect ratio of 77 resident passerine birds, that spend different amounts of time per day flying, were compared with those of 11 migrants. A decrease in wing loading and an increase in the aspect ratio of the birds’ wings were significant predictors of an increase in the amount of time per day that the resident birds spent flying. No significant differences in the wing morphology traits between migrant, and resident birds that spend large amounts of time per day flying, were detected. The conclusion is that resident birds that spend a large amount of time per day flying have been subjected to the same selection pressures for energy-efficiency that have shaped aspects of the wing morphology traits of migrants.
En ligne :	https://doi.org/10.1007/s10336-021-01870-4

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