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- W2334674406 abstract "-The behavior of Northern Shoveler (Anas clypeata) was studied from September 1996 to March 1997 in four protected areas, one artificial and three nature reserves, in the Marshes of Rochefort, Western France. Shoveler numbers exceeded the Ramsar criterion of international importance (i.e., 400 individuals) during most of the winter. Birds concentrated first at sewage works, showing a diel pattern of foraging depth which could be linked to vertical migrations of crustaceans. Zooplankton density decreased over the winter, leading the Shovelers to abandon the site for natural areas. The two sites which hosted most ducks were those where straining the water surface for zooplankton was the most frequent feeding behavior. At the two other sites, straining was gradually replaced by deeper foraging, possibly because Shovelers at least partially turned to benthic invertebrates. This study suggests that food abundance is of crucial importance for winter habitat selection by Shovelers, and that even the sites with abundant foods in autumn may not be able to sustain large concentrations of Shoveler through an entire winter. Our results support previous studies which highlighted the importance of some artificial wetlands for the conservation of this duck species. Management options that enhance zooplankton production and, in the event of invertebrate crashes, the creation of alternative sites at close distance appear to be highly valuable to wintering Northern Shoveler populations. Received 17 February 2000, accepted 4 April 2000." @default.
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- W2334674406 date "2000-01-01" @default.
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- W2334674406 title "Foraging Behavior and Habitat Choice of Wintering Northern Shoveler in a Major Wintering Quarter in France" @default.
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- W2334674406 doi "https://doi.org/10.2307/1522173" @default.
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