La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	What are we missing with only ground-level mist nets? Using elevated nets at a migration stopover site
Auteurs :	David N. Bonter, Auteur ; Elizabeth W. Brooks, Auteur ; Therese M. Donovan, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (79(3) SEP 2008)
Article en page(s) :	314-320
Langues:	Anglais
Résumé :	Mist nets deployed in a standard ground-level fashion capture birds approximately 0.5-2.6 m above the ground. In habitats where the vegetation extends above this height, standard mist net deployment may inadequately sample the targeted avian community and age- and sex-classes within species. Such sampling biases may raise questions regarding studies based on data from mist-net captures. To determine if birds were equally likely to be captured by mist nets at different heights, we constructed a series of paired ground-level and elevated mist nets (hereafter "net rigs") at a research station in western New York State. Net rigs were operated during 14 migration seasons from 2000 to 2006 (spring and fall each year), and 19,735 birds of 118 species were captured. Capture rates were significantly higher in ground-level nets, but 12 species were only captured in elevated nets. Of 44 species with at least 50 captures, 25 species were more likely to be captured in the ground-level nets and two species in the elevated nets. For four of

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