Title:

Aggressive interactions in swan geese Anser cygnoides and their hybrids

Subtitle:

Acta Ornithologica, vol. 39, no. 2 ; Zachowanie agresywne gęsi grubonosych oraz ich mieszańców ; Interactions in swan geese and hybrids

Creator:

Randler, Christoph ; Polska Akademia Nauk. Muzeum i Instytut Zoologii

Contributor:

Museum and Institute of Zoology, Polish Academy of Sciences

Publisher:

Museum & Institute of Zoology

Place of publishing:

Warszawa

Date issued/created:

2004

Description:

Bibliogr. p. 152-153 ; P. [147]-153 ; 27 cm ; Abstract. pol.

Type of object:

Journal/Article

Subject and Keywords:

Swan Goose, Anser cygnoides, Greylag Goose, Anser anser, aggressive behaviour, foraging, hybridsuperiority, competition, threat postures, wildfowl

Abstract:

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

Relation:

Acta Ornithologica

Volume:

39

Issue:

2

Start page:

147

End page:

154

Resource type:

Text

Detailed Resource Type:

Journal

Format:

text/xml

Source:

MiIZ PAN, call no. patrz sygn. czas. P.257-39-2 ; MiIZ PAN, call no. patrz sygn. czas. P.4568-39-2 ; click here to follow the link

Language:

eng

Rights:

Rights Reserved - Free Access

Terms of use:

Copyright-protected material. 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

Access:

Open