Aggressive communication by Larus glaucescens . Part 7. The role of the intruder

Aggressive communication between territory defenders and intruders in a glaucous-winged gull (Larus glaucescens ) colony was analyzed using 453 aggressive interactions (strings) recorded on video tape. Special attention was given to the role of the intruder in each interaction. Based on these analys...

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Bibliographic Details
Published in:Behaviour 1991-01, Vol.117 (3-4), p.161-181
Main Authors: Schwab, E R, Stout, J F
Format: Article
Language:English
Subjects:
Larus glaucescens
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Summary:Aggressive communication between territory defenders and intruders in a glaucous-winged gull (Larus glaucescens ) colony was analyzed using 453 aggressive interactions (strings) recorded on video tape. Special attention was given to the role of the intruder in each interaction. Based on these analyses, the display we named Slouch was described both posturally and functionally. It was concluded the chief differences between Upright and Slouch intruders was the degree of threat conveyed by each display to the territory defender. Intruders using Slouch were more site tenacious, they conveyed a greater level of threat than did Upright intruders, and consequently were able to remain longer in a territory.
ISSN:0005-7959