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- Title
Age-ratio bias among hunter-based surveys of Eurasian Wigeon Anas penelope based on wing vs. field samples.
- Authors
Fox, Anthony D.; Clausen, Kevin Kuhlmann; Dalby, Lars; Christensen, Thomas Kjær; Sunde, Peter; Robinson, Rob
- Abstract
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.
- Subjects
SEX ratio; ANAS penelope; BIRD age determination; FOWLING; SPATIO-temporal variation; DUCK shooting
- Publication
Ibis, 2015, Vol 157, Issue 2, p391
- ISSN
0019-1019
- Publication type
Article
- DOI
10.1111/ibi.12229