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    Patterns of Aggression in Gulls: Asymmetries and Tactics in Different Social Categories

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    PierottiR_Condor_96(3)590.pdf (867.4Kb)
    Issue Date
    1994-08-01
    Author
    Pierotti, Raymond
    Annett, Cynthia A.
    Publisher
    Central Ornithology Publication Office
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    During contests in Western Gulls, Larus occidentalis, we examined patterns of aggression in relation to sex, age class, and territorial status. Data were collected on agonistic contests during parts of three reproductive seasons on Southeast Farallon Island. This colony has dense nesting territories and appears to be near saturation, making breeding space a limiting and valuable resource. Established, territory-holding male gulls were able to defeat nearly all opponents. The exceptions were a few unestablished adult males early in the reproductive period that appeared to be equal, or superior to, established males in fighting ability and persistence. Established females were able to defend their territories against territory-holding neighbors, immature gulls, and adult female intruders, but often were forced to retreat by unestablished male intruders. Both immature and unestablished adult intruders more readily challenged an established female than an established male. The value of breeding territories, the primary contested resource, appeared to increase throughout the reproductive period as established birds became increasingly inclined to escalate encounters after eggs were laid, and even more inclined to escalate after chicks appeared. In contrast, unestablished adults became less common and, when present, less inclined to escalate as the season progressed.
    URI
    http://hdl.handle.net/1808/16712
    DOI
    https://doi.org/10.2307/1369461
    ISSN
    0010-5422
    Collections
    • Center for Latin American and Caribbean Studies Scholarly Works [736]
    • Center for Russian, East European, and Eurasian Studies Scholarly Publications [546]
    • Ecology & Evolutionary Biology Scholarly Works [1555]
    Citation
    Pierotti, Raymond; Annett, Cynthia. (1994). "Patterns of Aggression in Gulls: Asymmetries and Tactics in Different Social Categories." Condor, 96(3)590-599. http://www.dx.doi.org/10.2307/1369461.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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