La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Comparison of visual bird migration counts with radar estimates (2017)
Auteurs :	Matthias Schmidt, Auteur ; Janine Aschwanden, Auteur ; Felix Liechti, Auteur ; Gábor Wichmann, Auteur ; Erwin Nemeth, Auteur
Type de document :	Article
Dans :	Ibis (159(3) July 1, 2017)
Article en page(s) :	491-497
Langues:	Anglais
Mots-clés :	Radar
Mots-clés:	Alps ; Austria ; environmental impact assessment ; observation effort ; wind farms
Résumé :	In the context of an extensive study on bird migration in the Austrian Alps, we compared data from a fixed-beam radar with data collected by visual observation to estimate the intensity of migrating birds up to a height of 150 m above the ground. Migration traffic rates calculated from visual bird counts and radar measurements were strongly correlated. Using resampling techniques, we calculated a minimum observation effort for counting birds during a 5-week period of peak migration. We chose ±20% of the real mean as the criterion for a reliable estimation. Our results showed that at least 19 observation days are necessary to assess the mean number of migrants passing within this low altitudinal range.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/ibi.12473/abstract

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