Inny tytuł:

Acta Ornithologica, vol. 38, no. 2 ; Biologia rozrodu wrony siwej w Parku Narodowym "Ujście Warty"

Współtwórca:

Polska Akademia Nauk. Muzeum i Instytut Zoologii

Wydawca:

Museum & Institute of Zoology

Miejsce wydania:

Warszawa

Opis:

Bibliogr. p. 149 ; P. [143]-150 : ill. ; 27 cm ; Abstract in Polish. Taxa in Latin

Typ obiektu:

Journal/Article

Abstrakt:

The study area (16 km2) in "Ujście Warty" National Park, W Poland - was the valley of a lowland river at its confluence with the River Odra, covered by a mosaic of grassy vegetation and willow scrub. 111 breeding attempts were recorded during 2000-2002. The mean nest density (3.2 nests/km2) was higher than that recorded by other authors in agricultural landscapes, but lower than in urban areas. The nest construction was adapted to fit young willow trees. The mean clutch size was similar to that recorded in other populations (4.43), but eggs were smaller (41.2 mm x 29.1 mm). The hatching success was lower (76%) in comparison with other studies, but the mean number of fledglings (2.15 per nest and 2.96 per nest in successful broods) was relatively high. The main reasons for losses were unhatched eggs, predators, starved nestlings and poor nest construction. We hypothesise that the smaller egg size and lower hatching success recorded in this population was due to unfavourable and unpredictable feeding conditions (floods) during the period of egg formation and egg laying. Later in the season, receding floodwaters laid bare areas suitable for foraging on invertebrates; waterfowl eggs also became readily available. As a result of good conditions during chick rearing, the overall reproductive output was relatively high in comparison with other populations.

Czasopismo/Seria/cykl:

Acta Ornithologica

Tom:

38

Zeszyt:

2

Strona pocz.:

143

Strona końc.:

150

Szczegółowy typ zasobu:

Article

Format:

application/pdf

Identyfikator zasobu:

oai:rcin.org.pl:45706

Źródło:

MiIZ PAN, call no. P.257-38-2 ; MiIZ PAN, call no. P.4568-38-2 ; kliknij tutaj, żeby przejść

Język:

eng

Prawa:

Rights Reserved - Restricted Access

Zasady wykorzystania:

Copyright-protected material. Access only on terminals at the Museum and Institute of Zoology of the Polish Academy of Sciences, 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

Dofinansowane ze środków:

European Union. European Regional Development Fund ; Programme Innovative Economy, 2010-2014, Priority Axis 2. R&D infrastructure

Dostęp:

Closed