Changes in the breeding status of the southern black-backed gull (Larus dominicanus) colonies on Rangitoto Island, Hauraki Gulf, New Zealand | Notornis and Birds New Zealand

Southern Bird

Galbraith, M¹  Krzyzosiak, J¹  Aguilar, G¹  Oliver, R¹  Jones, G¹ 

关键词: black-backed gull;    colony;    kelp gull;    Larus dominicanus;    Rangitoto;   

DOI  :  

学科分类：农业科学（综合）

来源: Ornithological Society of New Zealand Inc.

【 摘 要 】

Thesouthernblack-backedgull(Larusdominicanus)isacommonspeciesthroughoutNewZealand,andhasasignificantpresenceinAucklandCity.LargecoloniesarepresentonRangitotoIslandonly8kmfromthecity’scentre.Theproximityofthesecoloniestotheanthropogenicresourcesofthecitymayhaveinfluencedbreedinglocationsandlocalpopulations.Usingfielddatafromthe2012/13breedingperiod,wecomparethecurrentstatusofthebreedingpopulationonRangitotoIslandwithhistoricaldatacollatedfromliterature.TheRangitotopopulationexhibitedrapidgrowththroughouttheearly20thcentury,apatternattributedtoenvironmentalchangesassociatedwithEuropeansettlementanddevelopment.Sincethe1980s,thecolonysizeshavedeclined,achangethatisconsistentwithothergullpopulationsbothnationallyandglobally.Thedriverofthepopulationchangesislikelytobetheavailabilityoffoodandtheexpansionofvegetationintothecolonies.Humandisturbanceandpredationarediscountedasimpactingonpopulationchange.

【 授权许可】

Unknown