Title:

Different Extinction Risks of the Breeding Colonies of Rooks Corvus frugilegus in Rural and Urban Areas of SW Poland

Subtitle:

Zróżnicowane ryzyko wymierania kolonii lęgowych gawrona na obszarach wiejskich i miejskich Śląska ; Extinction risk of Rook’s colonies

Creator:

Orłowski, Grzegorz ; Czapulak, Andrzej

Contributor:

Museum and Institute of Zoology, Polish Academy of Sciences

Publisher:

Museum and Institute of Zoology, Polish Academy of Sciences ; Natura Optima Dux Foundation

Place of publishing:

Warsaw

Date issued/created:

2007

Description:

pg(s) 145–155

Type of object:

Journal/Article

Subject and Keywords:

extinction risk ; population decline ; population distribution ; Rook ; Corvus frugilegus ; concentric analysis ; gawron ; gapa

Abstract:

In 1983–1999 in SW Poland (40 540 km2, 13% of the total area of Poland) the Rook was reported to nest in at least 270 colonies with a combined total of from ca. 18 to > 20 thousand breeding pairs. Between 1983–1988 and 1992–1999,105 (39% ) colonies were abandoned, i.e., 16–20% of the population as recorded in earlier periods. The largest drop in numbers (34%) occurred in rural populations. The median for abandoned colonies was 16 nests, which was nearly six times lower than that for active rookeries (median = 99). General linear models (GLM) indicate that the abandonment of colonies depends on their location (village, small town, city), the size and number of nests, and the presence of other rookeries in the vicinity of those studied. The best-fit model describing rookery extinction invoked the number of nests and other colonies within a radius of < 10 km from the colony studied. In each of three analyzed radii (10, 20 and 30 km) the numbers of nests and other colonies were decidedly higher around extinct rookeries. Active Rook colonies were farther away from the nearest rookery, and also from large colonies consisting of 50, 100 and 150 nests. The probability that a rookery would be abandoned was strongly negatively correlated with its size.

Relation:

Acta Ornithologica

Volume:

42

Issue:

2

Start page:

145

End page:

155

Resource type:

Text

Detailed Resource Type:

Journal

Format:

text/xml

Resource Identifier:

10.3161/068.042.0209

Source:

MiIZ PAN, call no. P.257 ; MiIZ PAN, call no. P.4568 ; click here to follow the link

Language:

eng

Language of abstract:

pol ; eng

Rights:

Rights Reserved - Free Access

Terms of use:

Copyright-protected material. May be used within the limits of statutory user freedoms

Digitizing institution:

Museum and Institute of Zoology of the Polish Academy of Sciences

Original in:

Library of the Museum and Institute of Zoology of the Polish Academy of Sciences

Access:

Open