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Zimowe spisy nietoperzy w Polsce

100%

Urbanczyk Z.

Lubuski Przegląd Przyrodniczy

1990

tom 01

nr 1

Winter roosting of Rooks Corvus frugilegus in Wroclaw

100%

Jadczyk P.

Acta Ornithologica

1994

tom 29

nr 1

39-47

In the 1988/1989 and 1989/1990 seasons, the winter grouping of corvids in the city of Wrocław (Lower Silesia, Poland) included 200,000-250,000 individuals, of which 92-94% were Rooks, 6-8% Jackdaws Corvus monedula and about 0.1% Hooded Crows Corvus corone cornix. Young Rooks made up 5-6% of the population. Numbers were estimated by counting flocks during their flights to the roosts. Rooks wintering in Wrocław nest on the Russian Plain, but probably also include a small number of birds grom the dty itself. In the course of the last 30 years, the size of the grouping of corvids has increased 10-fold, with numbers of Rooks increasing 20-fold and numbers of Jackdaws increasing by up to a half. Mean mortality of Rooks at the roosts was 0.74 individuals per night i e. 0.3%₀ of the whole population per wintering season. Of the birds dying, one-third were young. Corvids roosted in several roosts which were used to different extents. At least two were used regularly as primary roosts and the oldest roost had been used for over 40 years. Corvids foraged within 15-20 km of the roosts. Flights between the roosts and the foraging areas followed regular, permanent air corridors, according to a permanent scheme of gathering in places which were stages in the flight. The Rooks kept quiet at the roosts and during their flights. They foraged by actively seeking out food and by passively waiting for food to be thrown out by people. Their behaviour was wary.

Rozmieszczenie, charakterystyka i status ochronny noclegowisk gęsi w Polsce

80%

Lawicki L., Wylegala P., Wuczynski A., Smyk B., Lenkiewicz W., Polakowski M., Kruszyk R., Rubacha S., Janiszewski T.

Ornis Polonica

2012

tom 53

nr 1

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Zimowanie kulika wielkiego Numenius arquata w dolinie Wisły koło Gniewu

80%

Sikora A.

Ornis Polonica

2015

tom 56

nr 1

Jak zimują gawrony?

80%

Jadczyk P.

Ekonatura

2004

nr 12

Ograniczanie wyników

2 Ornis Polonica

1 Acta Ornithologica

1 Ekonatura

1 Lubuski Przegląd Przyrodniczy

2 Jadczyk P.

1 Janiszewski T.

1 Kruszyk R.

1 Lawicki L.

1 Lenkiewicz W.

1 Polakowski M.

1 Rubacha S.

1 Sikora A.

1 Smyk B.

1 Urbanczyk Z.

1 Wuczynski A.

1 Wylegala P.

1 2015

1 2012

1 2004

1 1994

1 1990

Wyniki wyszukiwania

Zimowe spisy nietoperzy w Polsce

Winter roosting of Rooks Corvus frugilegus in Wroclaw

Rozmieszczenie, charakterystyka i status ochronny noclegowisk gęsi w Polsce

Zimowanie kulika wielkiego Numenius arquata w dolinie Wisły koło Gniewu

Jak zimują gawrony?