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Changes in Mallard Anas platyrhynchos bill morphology after 30 years of supplemental stocking
Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Arles.
Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, Arles.
Kristianstad University, School of Education and Environment. (Akvatisk biologi och kemi)
Kristianstad University, School of Health and Society.
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2010 (English)In: Bird Study, ISSN 0006-3657, Vol. 57, no 3, 344-351 p.Article in journal (Refereed) Published
Abstract [en]

Capsule Massive releases of captive-reared Mallard for hunting purposes have been practiced for 30 years. During this period the number of lamellae per centimetre of bill length in wild Mallard populations has decreased. Aims Every year since the 1970s, several million captive Mallard have been released in Europe. This may lead to a spread of unnatural phenotypes into the wild. Nevertheless, the consequences of such introductions have not been examined. Methods Two widespread and common migratory ducks were studied: Mallard Anas platyrhynchos and Teal A. crecca. Mallard is the only duck species for which stocking programmes occur, and Teal served as a control. In a 'before-after' design, we compared duck bill lamellar density over the last 30 years. Results 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. Conclusions We hypothesize that the change in bill morphology was because of the propagation of captive Mallard into the wild: captive Mallard eat mainly large items, relaxing the natural selection pressure maintaining high lamellar density for sieving small prey in wild ducks.

Place, publisher, year, edition, pages
2010. Vol. 57, no 3, 344-351 p.
Keyword [en]
dabbling ducks, life-history, lamellar density, atlantic salmon, body, length, wild, evolution, size, ecomorphology, anseriformes
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-7520DOI: 10.1080/00063657.2010.486028ISI: 000280517300008OAI: oai:DiVA.org:hkr-7520DiVA: diva2:380714
Available from: 2010-12-22 Created: 2010-12-20 Last updated: 2014-08-01Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
  • vancouver
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