Tufted Duck (Aythya fuligula) habitat use and brood survival increases after fish removal from gravel pit lakes |
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Authors: | Giles N |
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Institution: | 1.The Game Conservancy, SP6 1EF, Fordingbridge, Hampshire, UK ; |
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Abstract: | This paper reviews research results on food competition between a freshwater fish community and a breeding Tufted duck population. After the experimental removal of fish from the Main Lake, the following effects were observed:
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1. Invertebrate (chironomid and gastropod) food for ducklings and adult Tufted ducks increased substantially.
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2. Tufted duckling brood use of the lake increased greatly and Tufted duckling survival appears to have increased.
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3. Shoveler and Pochard nested successfully for the first time.
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4. Submerged aquatic macrophytes grew profusely over the lake bed for the first time leading directly to large increases in use of the Lake by wintering herbivorous waterfowl.
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5. When fish were re-introduced to the Main Lake sampling bay the increases in invertebrate abundance and, to a less marked extent, macrophyte abundance were reversed.
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