Differential autumn migration of the aquatic warbler Acrocephalus paludicola.
Naturwissenschaften
; 100(11): 1095-8, 2013 Nov.
Article
en En
| MEDLINE
| ID: mdl-24154543
ABSTRACT
Relatively little attention has been paid to sex differences in the migration of birds in autumn. We studied the autumn migration strategy of molecularly sexed males and females in the globally threatened aquatic warbler Acrocephalus paludicola. We captured 176 birds at a stopover site in the Loire estuary at Donges, France. The median date for the passage of adults was 8 days earlier in males than females, although the timing of migration in first-year males and females was similar. This indicates that males, who are without parental duties, can start their migration earlier than females and first-year birds. Adults were significantly heavier than immature birds but did not have higher fat scores. In both age categories, more males (two to three times more) were captured. However, various factors (including tape-luring) can affect observed sex ratio.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Estaciones del Año
/
Pájaros Cantores
/
Migración Animal
Límite:
Animals
País/Región como asunto:
Europa
Idioma:
En
Revista:
Naturwissenschaften
Año:
2013
Tipo del documento:
Article