Habitat distribution of the mallard in relation to vegetation structure,food, and population density |
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Authors: | Nummi P Pöysä H Elmberg J Sjöberg K |
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Institution: | (1) Department of Applied Zoology, University of Helsinki, FIN-00014 Helsinki, Finland;(2) Evo Game Research Station, Finnish Game and Fisheries Research Institute, FIN-169770 Evo, Finland;(3) Department of Animal Ecology, Swedish University of Agricultural Sciences, S-90183 Umeå, Sweden |
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Abstract: | The mallard (Anas platyrhynchos Linnaeus) is a generalist feeder, breeding in a wide range of habitats, yet showing considerable between site differences in density. Variations in density and habitat use may result from inter- and intea-specific competition, habitat structure or food.We studied habitat selection of the mallard in four regions of Finland and Sweden. In each region, ten lakes were chosen ranging from oligotrophic to eutrophic. Habitat distribution of the mallard did not differ between regions despite variation in the density of the species and congenerics. Mallard density did not correlate with vegetation structure, but increased with food abundance and the number and density of congenerics although there were regional differences in mallard response. |
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Keywords: | mallard habitat distribution density food vegetation |
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