Long-term population trends of corvids wintering in urban parks in central Poland

• Autorzy: Mazgajski T. , Żmihorski M. , Halba R. , Woźniak A.
• Języki publikacji: EN

Abstrakty

EN

Changes in the numbers of corvids wintering in Warsaw (Central Poland), in the last sixteen years were analyzed. Four species were studied: Rook Corvus frugilegus L., Jackdaw C. monedula L., Hooded Crow C. corone cornix L. and Magpie Pica pica (L.) The results were based on density data for birds foraging in three urban parks. The bird counts were conducted in November and December 1988.2003. It was found that the number of wintering Rooks decreased significantly (0.5 fold), populations of Jackdaws and Hooded Crows - increased (4.25 and 3.95 fold, respectively), and no apparent trends were observed for Magpies during this period. Observed trends for Rooks as well as comparisons of limited data gathered earlier in other areas may confirm suggestions about the changing of migration routes of this species.

Słowa kluczowe

EN

Corvidae; Corvus corone; Corvus frugilegus; Corvus monedula; long-term study; Pica pica; wintering

PL

badania wieloletnie; Corvidae; Corvus corone; Corvus frugilegus; Corvus monedula; gawron; kawka; Krukowate; Pica pica; sroka; wrona siwa; zimowanie

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2008
• Tom: Vol. 56, nr 3
• Strony: 521--526
• Opis fizyczny: Bibliogr. 36 poz.,

Twórcy

autor

Mazgajski T.

autor

Żmihorski M.

autor

Halba R.

autor

Woźniak A.

• Department of Ecology, University of Warsaw, Krakowskie Przedmieście 26/28, 00-927 Warsaw, Poland,

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