Change of mate in a Greylag Goose Anser anser population effects of timing on reproductive success

Nilsson, Leif (author): Lund University,Lunds universitet,Biodiversitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Biodiversity,Department of Biology,Faculty of Science

(creator_code:org_t)

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Abstract Subject headings

The population of the West Baltic Greylag Goose Anser anser is migratory,breeding in southwest Scania, southernmost Sweden and wintering in theGuadalquivir Marismas, southwest Spain, or in the Dutch Delta. This populationhas been the subject of a long-term study o f a sample o f neck cottaredindividuals, and observations o f marked individuals were used to assessrates of mate fid e lity in this supposedly long-term monogamous species.The annual divorce rate during the years 1985-2000 was 10.5% [n-415], with29.7% of alt pairs ending in a divorce [n=158¡. A fte r divorce or death of thepartner, birds re-paired assortatively with individuals from th e ir own breedingarea, using the same wintering area. New p a ir bonds formed on thebreeding area, during one of three periods; ju s t a fte r re tu rn in spring, ju s ta fte r m o u lt and ju s t before departure in autumn. Divorce o r p a rtn e r deathduring the period 15 October - 28 February, when breeders were away fromthe breeding grounds, resulted in a significantly tower reproductive successduring the following breeding season, compared to mate losses during theperiod 1 June - 14 October.

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