Subtitle:

Breeding of the grey-lag goose ; Badania nad populacją gęgawy Anser anser gnieżdżącej się w dolinie Baryczy, Polska

Contributor:

Polska Akademia Nauk. Instytut Zoologii

Publisher:

Państwowe Wydawnictwo Naukowe

Place of publishing:

Warszawa

Description:

S. 179-216 : il. ; 24 cm

Type of object:

Czasopismo/Artykuł

Abstract:

This study was performed during the period 1972 to 1977. The goose population numbered 280-312 pairs. A similar number was reported before World War II and then after 1960. Between these dates there occurred a sudden drop (of approx. 75%) caused by a sharp increase in the exploitation of geese by man. The population study was performed on 122-154 paire of goose breeding in one of the fish-pond complexes. The geese nested exclusively on ponds. The time of start of egg laying coincided with the disappearance of ice cover, which could be explained in terms of antipredatory behaviour. The clutch size per breeding female ranged from 2 to 10 (12?) eggs, the mean value in different seasons being 4.9 to 5.6 eggs. No relationship was noted between mean clutch size and time of commencement of the nesting period. The mean clutch size decreased from 6. 7 to 3.5 as the season passed. Almost all of the clutches with more than 10 eggs were laid by two females. 44.2 % of nests ended in a failure. The main causes were predation by the hooded crow and abandonment of nests, in similar proportions. Other causes accounted for only 0.9 %. In successful clutches the rate of hatching success was 90.4%. Mortality of the young (till fledging) was 27.4 %. The mean production of young per breeding pair in one season was 2 young. The ratio of actual to potential production was 38%. This was sufficient to ensure stability of the goose population.

Relation:

Acta Ornithologica

Volume:

19

Issue:

1-6

Start page:

179

End page:

216

Detailed Resource Type:

Artykuł

Format:

application/pdf

Resource Identifier:

oai:rcin.org.pl:71227

Source:

MiIZ PAN, patrz sygn. czas. P.257, T. 19, Nr 8 ; MiIZ PAN, patrz sygn. czas. P.4568, T. 19, Nr 8 ; click here to follow the link

Language:

eng ; rus ; pol

Rights:

Licencja Creative Commons Uznanie autorstwa 3.0 Polska

Terms of use:

Zasób chroniony prawem autorskim. [CC BY 3.0 PL] Korzystanie dozwolone zgodnie z licencją Creative Commons Uznanie autorstwa 3.0 Polska, której pełne postanowienia dostępne są pod adresem: ; -

Digitizing institution:

Muzeum i Instytut Zoologii Polskiej Akademii Nauk

Original in:

Biblioteka Muzeum i Instytutu Zoologii PAN

Projects co-financed by:

Program Operacyjny Polska Cyfrowa, lata 2014-2020, Działanie 2.3 : Cyfrowa dostępność i użyteczność sektora publicznego; środki z Europejskiego Funduszu Rozwoju Regionalnego oraz współfinansowania krajowego z budżetu państwa

Access:

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