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1 December 2004 Aggressive Interactions in Swan Geese Anser cygnoides and their Hybrids
Christoph Randler
Author Affiliations +

Evidence for direct interspecific competition in wildfowl and between hybrids and their parent species is scarce. This study examined threat displays and agonistic encounters (n = 324) in a goose flock of 140 Swan Geese and 13 hybrids with Greylag Goose living in Heidelberg, SW Germany. In general, agonistic behaviour made up less than 1% of the time budget throughout the year as measured by focal animal sampling. Most encounters (84%) were won by the initiator, both in Swan Geese and in hybrids. No difference was found between Swan Geese and hybrids in the outcome of an encounter, suggesting equal competitive quality. There were differences with respect to threat postures with hybrids performing diagonal neck threats more often and intentional movements less often. This seems to be related to their hybrid origin, since Greylag Geese most often show diagonal neck and forward threat displays. There was no direct evidence for hybrid superiority or inferiority.



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Christoph Randler "Aggressive Interactions in Swan Geese Anser cygnoides and their Hybrids," Acta Ornithologica 39(2), 147-153, (1 December 2004).
Received: 1 February 2004; Accepted: 1 September 2004; Published: 1 December 2004
aggressive behaviour
Anser anser
Anser cygnoides
Greylag Goose
hybrid superiority
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