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Do stocking programs result in maladapted populations?: mallard bill morphology after 30 years of massive releases
French Hunting and Wildlife Agency, Arles, France.
French Hunting and Wildlife Agency, Arles, France.
Kristianstad University, School of Education and Environment. (Akvatisk biologi och kemi, Avdelningen för Naturvetenskap)
Kristianstad University, School of Education and Environment.
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2011 (English)In: Abstracts: Joint meeting of the 11th North American Crane Workshop and the 34th Annual Meeting of The Waterbird Society, Grand Island, Nebraska, USA, March 13-16, 2011, 2011, 31- p.Conference paper, Published paper (Other academic)
Abstract [en]

Every year since the 1970s, several million captive Mallard have been released in Europe for hunting purposes. This may lead to a spread of unnatural phenotypes into the wild. Two widespread and common migratory ducks were studied: Mallard    Anas platyrhynchos and Teal A. crecca. Mallard is the only duck species for which large-scale stocking programs occur in the region, and Teal hence serves as a control. In a « before-after » design, we compared duck bill lamellar density over the last thirty years. Lamellar density in Mallard, but not Teal, decreased. The observed 10 % decrease occurred in the first (proximate) centimetre of the bill, the most crucial in terms of food filtration. We hypothesize the observed change in bill morphology was due to the propagation of captive Mallard into the wild: captive Mallard mainly eat large items, relaxing the natural selection pressure maintaining high lamellar density for sieving small preys in wild ducks.

Place, publisher, year, edition, pages
2011. 31- p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-8904OAI: oai:DiVA.org:hkr-8904DiVA: diva2:478483
Available from: 2012-01-16 Created: 2012-01-16Bibliographically approved

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Elmberg, Johan
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