Spatial Variation in the Diet of the Barn Owl Tyto alba in the Caribbean

Ardea

Vincent Nijman¹  John A. de Freitas²  Maarten Flikweert¹  Tineke G. Prins¹ 

[1] 1 Zoological Museum Amsterdam (ZMA), University of Amsterdam, P.O. Box 94766,1090 GT Amsterdam, The Netherlands;2 CARMABI Foundation, P.O. Box 2090, Curaçao, Netherlands Antilles

关键词: Caribbean;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

OnBonaireweassessedBamOwlTytoalbadietsatfourdiscretesites.The233freshpelletscontained755identifiablepreyitemsfromfourtaxonomicorders.Averagepreydiversitydifferedtwo-tothreefoldbetweensites.Dietarycompositionshowedlargespatialvariationsbetweensites,frompredominantlyinsectivoroustoavian.Between-islandvariationwasassessedbycomparingthedietarycompositionofpopulationsofBarnOwlsonnineislandsthroughouttheCaribbeanregionasreportedintheliterature.On8/9islandsmammals(mainlyrodentsandbats)formedthemaindiet.Onhalfoftheislandsaboutafifthormoreofthepreycomprisedbirds.Reptilesand/orinsectswereeatenon5/9islands,butrarelydominatedthediet.Theselargewithin-islanddietarydifferencesreflectdifferentialpreyavailabilitiesintheCaribbean,possiblyenhancedlocallybyspecialisation.

【 授权许可】

Unknown