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Białystok, Poland

Dudzik K.,Wildlife Conservation Society | Polakowski M.,Zachodnia 30A 8 | Jankowiak L.,Adam Mickiewicz University | Dobosz R.,Wildlife Conservation Society | And 2 more authors.
Ornis Svecica

We describe a rare case of incestuous broods of Whooper Swan Cygnus cygnus in Świe{ogonek}tokrzyskie province, Poland. A sibling pair laid eggs and hatched young at the same site in 2010 and in 2011, nine kilometres from their own hatching place. Both broods were unsuccessful; the young died before autumn. We assume that the key factors explaining the inbreeding were the small local population and that Whooper Swans tend to disperse over short distances. Source

Polakowski M.,Zachodnia 30A 8 | Skierczynski M.,Adam Mickiewicz University | Broniszewska M.,Zachodnia 30A 8
Ornis Svecica

Urban areas are alternative wintering sites for species with ability to exploit the new conditions that cities offer, such as food, shelter and reduced prédation. During four winters (November-February), we recorded the number of Mallards along 108 km of rivers within an urbanization gradient from city centre to rural in north-east Poland. In the urban area, but not in the suburban and rural areas, there was an increase of numbers through winter with highest numbers in February, the coldest month. However, we found no correlation between numbers and ice cover. The only correlation was with feeding intensity by humans, and we suggest that intensity of feeding and the location of the feeding sites is the main factor determining number of wintering Mallards. This was supported by recoveries of ringed birds. Mallards ringed at good feeding sites in the city centre were recovered at the same sites whereas birds ringed in the periphery of the city tended to move to the centre in subsequent winters. Source

Polakowski M.,Zachodnia 30A 8 | Broniszewska M.,Zachodnia 30A 8 | Jankowiak L.,Adam Mickiewicz University | Cofta T.,Hoene 5A 5
Turkish Journal of Zoology

The unusual mixed song of a River Warbler (Locustella fluviatilis) was recorded in eastern Poland. The identified male used 2 types of songs recalling the River Warbler and the Grasshopper Warbler (Locustella naevia) alternately, which was confirmed by the interpretation of the sonograms. The most likely explanation of this unusual song is vocal mimicry, caused by the exposure of the recorded individual to the song of the Grasshopper Warbler in its acoustic environment at an early stage of its life. © TÜBİTAK. Source

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