Breeding and Population Density of the Eastern Screech Owl Megascops asio at the Northern Periphery of Its Range

Ardea

Christian Artuso¹ 

[1] 1 Department of Environment and Geography, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N5 ([e-mail])

关键词: Population Density;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Random-stratifiedspringnocturnalsurveysusingtapeplaybackwereconductedforEasternScreechOwlsMegascopsasiofrom2004through2007inWinnipeg,Manitoba,Canada,atthenorthernperipheryofitsrange.Surveyswerestratifiedby(1)humandensity,(2)riparianvs.non-riparianhabitat,and3)thepresenceorabsenceofsuburbangreenspace.Atotalof120transects(each1.75kmlong)weresurveyed,with55EasternScreechOwlsdetected.EasternScreechOwldensitiespeakedinmoderatetohigh-densitysuburbanareas(gt;20persons/ha),where36(66%)detectionsoccurred,andwerelowestinwildlands(lt;1pair/ha),wherenodetectionsoccurred.Fifty-one(93%)EasternScreechOwlsweredetectedinriparianareas.Only20(36%)EasternScreechOwlsweredetectedinsuburbangreenspaces.In4yearsIlocatedatotalof46successfulEasternScreechOwlnests,6failednests,and37territorieswithnon-breedingowls.Excludingrepeatcavityuses,atotalof61nestsitesandterritorycentreswerelocated,ofwhich38(62.3%)wereinnaturalcavities,21(34.4%)innestboxes,and2(3.3%)atsiteswherecavitychoicewasundetermined.Fledgingdatesrangedfrom28May–3July(mean15June,SE1.4)overthe4-yearperiod.EasternScreechOwlswerecloselytiedtoriparianhabitat,andshowedlargeraveragebroodsizesandearlieraveragefledgingdatesinmoderateandhigh-densitysuburbanareasthaninlow-densitysuburbanandruralareas.

【 授权许可】

Unknown