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This publication is protected and available only for logged users.

Title: Factors Affecting the Between-Season Divorce Rate in the Urban Populations of the European Blackbird Turdus merula in North-Western Poland

Creator:

Wysocki, Dariusz

Date issued/created:

2006

Resource Type:

Journal

Subtitle:

Czynniki wpływające na rozwody w miejskiej populacji kosa ; Between-season divorce rate in urban populations of Blackbird

Contributor:

Museum and Institute of Zoology, Polish Academy of Sciences

Publisher:

Museum and Institute of Zoology, Polish Academy of Sciences

Place of publishing:

Warsaw

Description:

pg(s) 71–78

Abstract:

The between-season divorce rate of the European Blackbird was studied in 1997–2003 in two city parks in northwest Poland. Within the population studied, 52 and 51% of pairs in each park were observed to divorce. Of the eight parameters included in the analysis, the divorce rate was found to depend on marriage training and the time of territory acquisition. Territory quality, breeding success, synchrony in territory acquisition, age and size of the partners were unimportant. 19.5% of pairs with marriage training were observed to divorce, whereas 65.5% of pairs without marriage training did so. Birds acquiring their territories earlier divorced their partners significantly less frequently than those acquiring a territory at a later date. During the first post-divorce breeding season, young males that stayed in the park started breeding earlier than in the preceding year; old males started breeding later, whereas the difference was not significant in young or old females. Regardless of their age, the divorced birds showed a reduced number of fledglings raised with a new partner. The reduced breeding success may be a result of poor adaptation to increased pressure from predators. Similar divorce rates in pairs with and without breeding success and the rarer divorces among pairs claiming their territories earlier strongly support the habitat-mediated hypothesis. However, the more frequent desertion of poor territories by females, as well as differences found between older males and females in the timing of the onset of breeding before and after divorce, indicate that an individual may choose divorce to maximize fitness.

Relation:

Acta Ornithologica

Volume:

41

Issue:

1

Start page:

71

End page:

78

Format:

text/xml

Resource Identifier:

oai:rcin.org.pl:55568 ; 10.3161/068.041.0101

Source:

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

Language:

eng

Language of abstract:

eng ; pol

Rights:

Rights Reserved - Restricted Access

Terms of use:

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.

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

Projects co-financed by:

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