Subtitle:

Acta Ornithologica, vol. 35, no. 1 ; Czy synchronizacja lęgów może wpływać na śmiertelność piskląt kormorana ; Timing and breeding synchronisation influence on chick mortality in the cormorant

Contributor:

Polska Akademia Nauk. Muzeum i Instytut Zoologii ; Meeting of the European Ornithologists' Union (2 ; 1999 ; Gdańsk)

Publisher:

Muzeum i Instytut Zoologii PAN

Place of publishing:

Warszawa

Description:

Ref. wygłoszony na Second Meeting of the European Ornithologists' Union ; Bibliogr. s. 37-38 ; S. [33]-39 : il. ; 27 cm ; Streszcz. pol.

Type of object:

Czasopismo/Artykuł

Abstract:

In 1996, following a relatively severe and prolonged winter, Great Cormorants started to breed at the Kąty Rybackie colony (NE Poland) one month later than in 1995 but breeding finished at the same time in both years. The estimated total food consumption of the Cormorants was lower during the shorter and more synchronised 1996 breeding season (737 tonnes) than in 1995 (805 tonnes) despite the larger population present in 1996 (5929 pairs) than in 1995 (4942). However, during the period of peak energy need in June the estimated total daily food consumption of Cormorants present in the colony was about 2 tonnes higher in 1996. In June 1996, after a couple of windy days, 24.3% of chicks died and the total fledging success was lower (2.19 fledglings/nest) than in 1995 (2.45). The observed mass chick mortality could be due to the combined effect of strong breeding synchronisation, decreased food availability, and increased costs of foraging due to strong winds. Large breeding colonies of Cormorants can only function successfully when the suitable breeding period is prolonged and breeding can start early. Long-term climate change due to global warming could have favoured the observed Cormorant population increase during the last decades and its expansion into NE Europe. Asynchrony could be adaptive towards alleviating the food requirements of both individual broods and the whole colony.

Relation:

Acta Ornithologica

Volume:

35

Issue:

1

Start page:

33

End page:

39

Detailed Resource Type:

Artykuł ; Materiały konferencyjne

Format:

application/pdf

Resource Identifier:

oai:rcin.org.pl:45241

Source:

MiIZ PAN, patrz sygn. czas. P.257, Vol. 35, No 1 ; MiIZ PAN, patrz sygn. czas. P.4568, Vol. 35, No 1 ; click here to follow the link

Language:

eng ; pol

Rights:

Prawa zastrzeżone - dostęp ograniczony

Terms of use:

Zasób chroniony prawem autorskim. Korzystanie dozwolone wyłącznie na terminalach Muzeum i Instytutu Zoologii PAN w zakresie określonym przez przepisy o dozwolonym użytku.

Digitizing institution:

Muzeum i Instytut Zoologii Polskiej Akademii Nauk

Original in:

Biblioteka Muzeum i Instytutu Zoologii PAN

Projects co-financed by:

Program Operacyjny Innowacyjna Gospodarka, lata 2010-2014, Priorytet 2. Infrastruktura strefy B + R ; Unia Europejska. Europejski Fundusz Rozwoju Regionalnego

Access:

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