Warblers of the Reed

Most magnificient birds of world - reed warblers

Differential autumn migration of the aquatic warbler Acrocephalus paludicola.

Publication Type:Journal Article
Year of Publication:2013
Authors:K. Wojczulanis-Jakubas, Jakubas, D., Foucher, J., Dziarska-Pałac, J., Dugué, H.
Date Published:2013 Nov
Keywords:Adipose Tissue, Age Factors, Animal Migration, Animals, Body Size, Female, France, Male, Seasons, Sex Factors, Sex Ratio, Songbirds

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.

Alternate Journal:Naturwissenschaften
Thu, 2015-10-15 13:00 -- eric
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith