Stopover Behaviour and Dominance: A Case Study of the Northern Wheatear Oenanthe oenanthe
[摘要] Inmigrantsthatoccupyanddefendterritoriesduringmigration,socialstatuscandetermineaccesstopreferredresourcesandalterstopoverbehaviour.ThepotentialvariationinstopoverbehaviourbetweendominantandsubordinateindividualsoftheNorthernWheatearOenantheoenanthe,aterritorialmigrantbirdspecies,wasexaminedatanoffshorestopoverareaontheislandofHelgolandduringthespringof2009.Overall,territorieswereoccupiedanddefendedbydominantbirds(identifiedasthosethatwon≥50%oftheconspecificaggressiveencounters).Dominantbirdsalsoinitiatedmostconspecificaggression.Unabletosettleanddefendaterritory,subordinatestendedtobevagrantandstoppedoverforshorterperiodsoftime.Thisislikelyduetothefactthatsubordinateswerecontinuouslydisplacedbydominants,andthereforehadlessaccesstofood.Subordinatesalsotendedtoforageatlowerrates.NorthernWheatearswereprimarilyfoundinzoneswithahighernumberofshelters,supportingtheideathatavoidanceofpredationplaysaroleinsiteselection.
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[效力级别] [学科分类] 动物科学
[关键词] Territoriality [时效性]
