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Predation risk constrains the plasticity of foraging behaviour in teals, Anas crecca: a flyway-level circumannual approach
Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, Arles.
Kristianstad University, Department of Mathematics and Science.
Centre d'Etudes Biologiques de Chizé - CNRS UPR 1934, Beauvoir-sur-Niort.
Kristianstad University, Department of Mathematics and Science. (Akvatisk biologi och kemi)
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2007 (English)In: Animal Behaviour, ISSN 0003-3472, E-ISSN 1095-8282, Vol. 73, no 5, p. 845-854Article in journal (Refereed) Published
Abstract [en]

The trade-off foragers make between predation risk and feeding efficiency is readily studied in dabbling ducks, which have stereotyped feeding methods, some of which prevent predator detection while others do not. Teals forage mostly with only the bill submerged (eyes above the water surface) in winter, but use a broader foraging repertoire in summer. Given the different environments used by teals over the year, it is likely that such a shift is due to changes in diet, but it may also be caused by differences in predation risk between habitats. However, neither predation risk nor teal behaviour has been studied with consistent methods around the year or throughout any of its flyways. Covering wintering, spring-staging, breeding and moulting sites, we combined focal observations of teals and predator flyover data from seven regions ranging from southern France to northern Sweden. Although not apparent at the scale of days within sites, teals indeed relied more on shallow foraging where predation risk was higher, i.e. at wintering sites. Average foraging depth increased gradually from September to August, i.e. from wintering to breeding sites. Foraging bout length of deeply foraging teals did not decrease over the year, suggesting that it is through selection of foraging technique, rather than by the balance between foraging and interruptions, that birds adjust to predation risk. This study highlights behavioural plasticity in response to contrasting selection regimes within a flyway, in dabbling ducks as well as long-distance migrants in general.

Place, publisher, year, edition, pages
2007. Vol. 73, no 5, p. 845-854
Keyword [en]
Anas crecca, circumannual, feeding efficiency, flyway, foraging, predation risk, teal, trade-off, HARRIERS CIRCUS-AERUGINOSUS, VIGILANCE TRADE-OFF, DABBLING DUCKS, GROUP-SIZE, NICHE ORGANIZATION, LAMELLAR DENSITY, FEEDING-BEHAVIOR, BODY LENGTH, FLOCK SIZE, BIRDS
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Biological Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-5378DOI: 10.1016/j.anbehav.2006.06.019ISI: 000246908300012ISBN: 0003-3472 (print)OAI: oai:DiVA.org:hkr-5378DiVA: diva2:280025
Available from: 2009-12-08 Created: 2009-12-07 Last updated: 2017-12-12Bibliographically approved

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Elmberg, Johan

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