Long-Term Dynamics of Long-Eared Owls Asio otus at a Northern Winter Roost in European Russia
[摘要] WeinvestigatedthefactorsinfluencingthedynamicsofLong-earedOwlsAsiootuswinteringinMoscow.Thestudywascarriedoutin2001–2011.Twelvecommunalroostsand14solitarywinteringowlswerefound.Numberofactiveroostswaspositivelycorrelatedwiththetotalnumberofwinteringowlsperyear.Thefourlargestroostswereactiveformanyyears,withupto16individualsinasinglewinter(9.9±1.3onaverage).GeneralizedlinearmodelsindicatedthatthenumberofwinteringowlswasinfluencedsimultaneouslybytheabundanceofCommonVoleMicrotusarvalisinthepreviousautumnandinspring,andtheowls'breedingnumbersinthestudyplot.Themostimportantfactorwasvoleabundanceinearlyspringindirectlyindicatingfoodsupplyinlatewinter.TheinfluenceofweatherwasinvestigatedontheregularlysurveyedlocalsiteinMoscow.Themaximumnumberofowlsattheroostingsitevariedfrom0to9individuals(2.1±0.4onaverage).Amongweatherfactors,themostimportantinfluenceonthedynamicsofowlswasbysnowcoverandwindjointly,thoughthesnowwasundoubtedlyofgreatestsignificance.Airtemperatureandprecipitationturnedouttobealmostofnoimportanceforowldynamicsattheroostingsite.
[发布日期] [发布机构]
[效力级别] [学科分类] 动物科学
[关键词] Food Supply [时效性]
