Abstract
In five years (1992, 1994–97) we measured the frequency of extra-pair paternity (EPP) in a Bavarian population of polygynous Great Reed Warblers (Frankische Weiher region: 49°40'N, 10°51'E); these data were compared with corresponding findings in Sweden. Progeny from copulations with a male other than the partner (extra-pair young, EPY) were identified by multi-locus DNA fingerprinting with oligonucleotide probes. In 48 broods with 194 nestlings we found 19 EPY in 5 broods. The extra-pair fertilisation (EPF) rate as a percentage of total juveniles (9.8%) is higher, but that with reference to nests (10.4%) is only insignificantly higher than in Sweden.
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