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• W2006183567 abstract "The role of estrogens in reproductive behavior of free-living birds has been little investigated, despite the importance of estrogens in coordinating reproductive behavior and the need for information on potential effects of estrogenic contaminants on wildlife. We gave subcutaneous implants of estradiol (E2) to 15 female Lapland longspurs (Calcarius lapponicus), an arctic bird with a six-week breeding season. Controls were 9 females with empty implants and 14 unimplanted females. After implantation, E2 females had greater E2 levels and greater body mass than controls. We did not detect any increases in, or prolongation of, sexual or nest-building behavior. The incubation period was longer for E2 nests than for control nests. Nest videotapes showed that E2 females and their mates exhibited normal nestling care, and nestling growth, fledging success, and overwinter survival were also unaffected. However, whenever the males arrived at the nests, E2 females showed a significantly greater likelihood of begging from the male rather than leaving the nest. Courtship or incubation feeding have been considered atypical for this species, and it is not clear what role E2 normally plays in promoting begging behavior. Overall, elevated E2 levels did not result in any obvious costs for the female, save perhaps for slightly reduced incubation efficiency. The weak response to hormonal implants is similar to patterns seen in male Lapland longspurs, and may be related to the short breeding season. However, since little is presently known about the role of estrogens in behavior of wild female birds, it remains to be seen whether these patterns are typical of female passerines in general, or of short-season breeders. Further research on effects of estrogens (both exogenous and endogenous) on free-living female birds is needed." @default.
• W2006183567 created "2016-06-24" @default.
• W2006183567 creator A5042807288 @default.
• W2006183567 creator A5089768478 @default.
• W2006183567 date "2004-07-01" @default.
• W2006183567 modified "2023-09-27" @default.
• W2006183567 title "Effect of estradiol implants on reproductive behavior of female Lapland longspurs (Calcarius lapponicus)" @default.
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• W2006183567 doi "https://doi.org/10.1016/j.ygcen.2004.03.015" @default.
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