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- W2186826043 abstract "Abstract A major decline in submerged aquatic vegetation (SAV) in Chesapeake Bay has altered the diet of wintering Canvasbacks (Aythya valisineria) from historically plant to a combination of benthic animal foods, especially the ubiquitous Baltic clam (Macoma balthica), supplemented with anthropogenic corn (Zea mays). Because the isotopic signature of corn is readily discriminated from bay benthos, but not SAV, we used stable-isotope methodology to investigate the corn–SAV component of the winter diet of Canvasbacks. Feeding trials with penned Canvasbacks were conducted to establish turnover rates and fractionation end-point loci of δ13C and δ15N signatures of whole blood for individual ducks fed ad libitum diets of (1) Baltic clams, (2) Baltic clams and corn, and (3) tubers of wild celery (Vallisneria americana). Turnover time constants averaged 4.5 weeks, indicating that signatures of wild ducks would be representative of bay diets by late February. Isotopic signatures of wild Canvasbacks sampled in Feb..." @default.
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- W2186826043 date "2001-01-01" @default.
- W2186826043 modified "2023-09-24" @default.
- W2186826043 title "STABLE-ISOTOPE ANALYSIS OF CANVASBACK WINTER DIET IN UPPER CHESAPEAKE BAY" @default.
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- W2186826043 doi "https://doi.org/10.1642/0004-8038(2001)118[1008:siaocw]2.0.co;2" @default.
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