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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Record of a mixed brood of Short-toed Treecreeper Certhia brachydactyla and Eurasian Treecreeper C. familiaris
Auteurs :	Thorsten Krueger, Auteur ; Tobias Chrost, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (135(1) 2014)
Article en page(s) :	35-43
Résumé :	At the end of April 2014 a Mixed brood of Short-toed Treecreeper Certhia brachydactyla and Eurasian Treecreeper C. familiaris was discovered in a beech-oak forest within the city of Oldenburg, NW Lower Saxony, Germany. Observations revealed that the Short-toed Treecreeper was the male and the Eurasian Treecreeper of the race C. f. macrodactyla the female. Both individuals showed all species-specific characters each and were photographically documented, so the identification - unsupported by vocalizations - can be considered as certain. Lower Saxony is situated at the western edge of the range of Eurasian Treecreeper in continental Europe. The distance from the place of the mixed brood to the edge of the range with high square occupancy in Lower Saxony is about 60-100 km. While Eurasian Treecreeper is a rare breeding bird in NW Lower Saxony and occurs isolated, Short-toed Treecreeper is common and widespread. Besides a report (unfortunately not further described) on interbreeding between both species in Denmark in 1984, when a polygynous Short-toed Treecreeper male was mated with a Eurasian Treecreeper female, and a record of a mixed brood (the Eurasian Treecreeper was the male) with one fledged young from The Netherlands in 2005, our finding represents the third record of hybridization between the two species and the second successful breeding record of a mixed pair Short-toed x Eurasian Treecreeper. The mixed broods in Denmark and in The Netherlands took place at the edge of the range as well, but in the case of the Danish record at the edge of Short-toed Treecreeper's range, while Eurasian Treecreeper is widespread. The situation on the edge of the range and the role of mixed singing or imitation singing as potential causes for hybridization between both species are discussed.

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