Long-Term Dynamics of Long-Eared Owls Asio otus at a Northern Winter Roost in European Russia

Ardea

A.V. Sharikov¹  E.V. Ganova¹  T.V. Makarova¹ 

[1] 1 Research group of Avian population ecology, Zoology and Ecology Department, Moscow Pedagogical State University, Kibalchicha str. 6-5, 129164, Moscow, Russia;

关键词: Food Supply;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 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.

【 授权许可】

Unknown