Body size, fitness and compatibility in Barnacle GeeseBranta leucopsis

Ibis - Tập 138 Số 4 - Trang 700-709 - 1996
Sharmila Choudhury1, Jeffrey M. Black1, Myrfyn Owen1
1The Wildfowl & Wetlands Trust, Slimbridge, Gloucestershire GL2 7BT, UK

Tóm tắt

Large‐sized Barnacle GeeseBranta leucopsisof both sexes had a higher probability of breeding successfully in any particular year and produced more goslings than did smaller birds. Large females paired at an earlier age, suggesting that they were preferred as mates and were likely to have entered the breeding population earlier. The relative sizes of the pair bond members also affected fitness. Most birds were able to maximize their breeding performance by mating with relatively similar sized partners; the greater the size disparity of mates, the lower the breeding performance. This supports the idea that compatibility of mates may be important in determining fitness of the pair. The success of different pair types was also affected by environmental conditions, with certain size combinations doing better in some years and poorly in other years.

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