Język metadanych
Zróżnicowane ryzyko wymierania kolonii lęgowych gawrona na obszarach wiejskich i miejskich Śląska ; Extinction risk of Rook’s colonies
Twórca:Orłowski, Grzegorz ; Czapulak, Andrzej
Współtwórca:Museum and Institute of Zoology, Polish Academy of Sciences
Wydawca:Museum and Institute of Zoology, Polish Academy of Sciences ; Natura Optima Dux Foundation
Miejsce wydania: Data wydania/powstania: Opis: Typ obiektu: Temat i słowa kluczowe:extinction risk ; population decline ; population distribution ; Rook ; Corvus frugilegus ; concentric analysis ; gawron ; gapa
Abstrakt: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.
Czasopismo/Seria/cykl: Tom: Zeszyt: Strona pocz.: Strona końc.: Typ zasobu: Szczegółowy typ zasobu: Format: Identyfikator zasobu: Źródło:MiIZ PAN, call no. P.257 ; MiIZ PAN, call no. P.4568 ; kliknij tutaj, żeby przejść
Język: Język streszczenia: Prawa: Zasady wykorzystania:Copyright-protected material. May be used within the limits of statutory user freedoms
Digitalizacja:Museum and Institute of Zoology of the Polish Academy of Sciences
Lokalizacja oryginału:Library of the Museum and Institute of Zoology of the Polish Academy of Sciences
Dostęp:Treść tej publikacji znajduje się poza biblioteką cyfrową.
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https://www.bioone.org/doi/pdf/10.3161/068.042.0209