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• W2332610120 abstract "During October-May 1982-84, we compared food availability, food use, and gut morphology of northern shovelers (Anas clypeata) on coastal estuarine wetlands in south Texas and on several freshwater lakes 18 km inland to evaluate the relative importance of estuarine versus freshwater habitats. Of 3 seasons and 3 times of day examined, shovelers spent more time feeding in saltwater than freshwater during early winter (P = 0.005) and afternoon (P = 0.005). Available biomass of plankton, nekton, and seeds was greater (P < 0.001) in freshwater than saltwater. Animal foods composed 80% of the saltwater compared to 50% of the freshwater diet. Although plankton composed similar (P = 0.56) proportions of the freshwater and saltwater diets, shovelers ingested more vegetation (P < 0.001) in freshwater and more nekton (P < 0.001) in saltwater. A preference assessment of 8 taxa of shoveler animal foods ranked plankton first and freshwater shrimp (Palaemonetes spp.) last in both habitats. Shoveler intestines were heavier in freshwater during 1982-83 (P < 0.001), but heavier in saltwater (P = 0.048) in 1983-84. During midwinter, shoveler intestines were longer (P = 0.0044) and gizzards were heavier (P < 0.001) in saltwater than freshwater. Overall, ceca mass (P < 0.001) and length (P < 0.001) were greater in freshwater. Food availability and gut morphology data suggest that freshwater wetlands were of higher quality than saltwater wetlands for wintering shovelers. Management of waterfowl habitats in the Texas Gulf Coastal Zone should emphasize protection of freshwater areas from saltwater intrusion and other development activities to maintain optimal wintering habitat for northern shovelers, and perhaps other waterfowl as well." @default.
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• W2332610120 date "1996-10-01" @default.
• W2332610120 modified "2023-10-16" @default.
• W2332610120 title "Winter Feeding Ecology of Northern Shovelers on Freshwater and Saline Wetlands in South Texas" @default.
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• W2332610120 doi "https://doi.org/10.2307/3802385" @default.
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