Comparing population trend estimates of migratory birds from breeding censuses and capture data at a spring migration bottleneck.

ABSTRACT: Europe has a well-established network of breeding bird monitoring that is used to produce supranational indices of population trends for many species. However, a comparison of breeding bird censuses with other methods may be beneficial to confirm the validity of such indices. The aim of this study was to assess the value of standardized capture data of migratory birds at migration bottlenecks as an indicator of the effective breeding populations. One limitation to this method is that several populations are co-occurring at these bottlenecks and their catchment areas need to be clearly identified to allow extrapolation of population indices. Here, we used standardized trends in capture numbers of 30 species on the island of Ponza, a migration bottleneck in the central Mediterranean, and com

SUBMITTER: Maggini I 

PROVIDER: S-EPMC7820168 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature