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- W2306605004 abstract "A study was conducted from 1982 to 1984 on nesting ~ed-necked Grebes at Creston, B.C. Part of the population nested in cattails behind a man-made dyke and part nested on accumulations of water milfoil on an adjacent lake. Both shared a common foraging area, the lake itself. Adults nesting behind the dyke flew across to forage for themselves and brought prey back to their young. This study assessed costs and benefits of nesting in the two different habitats during the preand post-hatching periods. Because Red-necked Grebes have high wing-loading, flight is energetically costly. Additional energetic costs borne by those that flew to forage were reflected in the size of prey chosen. Habitat quality behind the dyke was superior, with greater protection from wind and wave damage, more stable water levels, lack of perches for aerial predators, and low human disturbance. Mean clutch size behind the dyke (3.25) was significantly smaller than in the lake (4.07, P < 0.005). Hatching success behind the dyke was significantly greater than on the lake (p < 0.001) and young hatched about one month earlier. The mean number of young hatched per successful nest was not significantly different between the two areas. Chicks were fed both invertebrates (primarily odonate larvae) and fish. The importance of odonates decreased as the chicks aged. Items procured by flight were larger than those" @default.
- W2306605004 created "2016-06-24" @default.
- W2306605004 creator A5067753404 @default.
- W2306605004 date "1986-01-01" @default.
- W2306605004 modified "2023-09-26" @default.
- W2306605004 title "Effects of a man-made dyke on the reproductive behavior and nesting success of red-necked grebes" @default.
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- W2306605004 hasPublicationYear "1986" @default.
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