Do parasitic common goldeneye Bucephala clangula females choose nests on the basis of host traits or nest site traits?

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Abstract

Conspecific brood parasitism (CBP) is an important alternative breeding strategy for gaining reproductive output in birds. While interactions between hosts and parasites and consequences of CBP to breeding success of both parties have been studied a lot, the roles of host characteristics and nest site characteristics in CBP have received less attention. We studied the relative importance of host-related traits, such as female condition and breeding experience, and nest-site-related factors, such as overall nest site preference and occupation rate, in explaining the occurrence of CBP in a common goldeneye Bucephala clangula population. We used spatially and temporally extensive data sets, analysed the data with generalized linear mixed models that allowed us to account for the non-independency of individual nesting attempts across females and nesting sites, and used an information theoretic approach in model selection and inference. About half of the nests were parasitized annually during the seven year study period. The occurrence of CBP decreased with advancement of the breeding season but late nests were also frequently parasitized. We found that the occurrence of CBP was better explained by nest-site characteristics than host traits, implying that parasitic females target a given nest based on factors related to the nest site itself rather than on the host. Our results suggest that more attention should be paid to factors associated with nest site attractiveness and quality when studying laying decisions of parasites and the occurrence of CBP in general. © 2010 The Authors.

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APA

Paasivaara, A., Rutila, J., Pöysä, H., & Runko, P. (2010). Do parasitic common goldeneye Bucephala clangula females choose nests on the basis of host traits or nest site traits? Journal of Avian Biology, 41(6), 662–671. https://doi.org/10.1111/j.1600-048X.2010.05145.x

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