1. La polygynie chez le Gobemouche noir Ficedula hypoleuca dans l'ouest de la Suisse.
- Author
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Ravussin, Pierre-Alain, Arrigo, Daniel, and Schaub, Michael
- Subjects
- *
POLYGYNY , *PIED flycatcher , *BIRDS , *ORNITHOLOGY - Abstract
The polygyny in Pied Flycatchers has been studied for almost 40 years in two nest box networks in western Switzerland. 577 nests were monitored in Baulmes between 1980 and 2016, and 663 nests were monitored near Grandson and Concise between 1989 and 2016. The overall rate of polygyny was relatively high in Baulmes, with 27.4 % of nests, but only 7.8 % of nests in the Grandson region. The distance between two nests of the same polygynous male varied between 40 m and 860 m, with most cases between 100 and 200 m. Successive nests of the same polygynous male showed a difference in laying date between 0 and 21 days. Clutch sizes and hatching success showed little variation between monogynous and polygynous pairs. Breeding success, however, was lower in secondary polygynous pairs, especially when the male made little or no contribution to feeding. Compared to the age structure of monogynous pairs, which made up the vast majority, access to polygyny seemed to be the prerogative of males over one year old. On the other hand, most secondary polygynous pairs were composed of yearling females. [ABSTRACT FROM AUTHOR]
- Published
- 2024