La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Age-ratio bias among hunter-based surveys of Eurasian Wigeon Anas penelope based on wing vs. field samples (2015)
Auteurs :	Anthony D. Fox, Auteur ; Kevin Kuhlmann Clausen, Auteur ; Lars Dalby, Auteur ; Thomas Kjær Christensen, Auteur ; Peter Sunde, Auteur
Type de document :	Article
Dans :	Ibis (157(2) April 2015)
Article en page(s) :	391-395
Langues:	Anglais
Mots-clés:	Demography ; Management ; Reproduction ; field ratios ; hunting bag ; wing surveys
Résumé :	We compared age and sex ratios among Eurasian Wigeon Anas penelope derived from Danish field observations and hunter-based shot samples throughout an entire winter. Sex ratios did not differ significantly between the two samples. Overall, first-year males were more than three times more likely to be represented than adult males in the hunter sample compared with field samples and were 7–20 times overrepresented in the hunting sample at the beginning of the season. These results confirm the need to account for such bias and its temporal variation when using the results of hunting surveys to model population parameters. Hunter-shot age ratios may provide a long-term measure of reproductive success of dabbling duck flyway populations given an understanding of such bias.
En ligne :	http://onlinelibrary.wiley.com/doi/10.1111/ibi.12229/abstract

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...