Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient

We studied geographic variation in the diet of Western Barn Owls (Tyto alba) along a urban-rural gradient in central-eastern Argentina and identified 5,231 prey items. Mammals were present in all samples, whereas birds and amphibians were present in 79.1 and 50.0% of the samples, respectively. There...

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Autor principal:	Cueto, Gerardo Ruben
Publicado:	2012
Materias:	bee butterfly diet geographical variation invasive species lizard native species niche breadth periurban area predator prey capture raptor rodent rural area specialization urban area urbanization Argentina Amphibia Aves Mammalia Muridae Papilionoidea Rodentia Squamata Strigiformes Tyto alba Tytonidae Vertebrata
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15594491_v124_n3_p589_Teta http://hdl.handle.net/20.500.12110/paper_15594491_v124_n3_p589_Teta
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_15594491_v124_n3_p589_Teta
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spelling	paper:paper_15594491_v124_n3_p589_Teta2023-06-08T16:23:48Z Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient Cueto, Gerardo Ruben bee butterfly diet geographical variation invasive species lizard native species niche breadth periurban area predator prey capture raptor rodent rural area specialization urban area urbanization Argentina Amphibia Aves Mammalia Muridae Papilionoidea Rodentia Squamata Strigiformes Tyto alba Tytonidae Vertebrata We studied geographic variation in the diet of Western Barn Owls (Tyto alba) along a urban-rural gradient in central-eastern Argentina and identified 5,231 prey items. Mammals were present in all samples, whereas birds and amphibians were present in 79.1 and 50.0% of the samples, respectively. There were significant differences in vertebrate assemblages consumed by Barn Owls at the opposite extremes of the gradient. Native sigmodontine rodents comprised 85.8 of the total prey items, especially towards periurban and rural areas. Exotic murid rodents were the main prey item in urban sites, while birds increased in frequency in urban and periurban areas. Food niche breadth and standardized food niche breadth values were higher at intermediate levels of urbanization (= periurban). This 'periurban peak' in species diversity is a relatively well-known pattern, previously reported for taxa such as birds, lizards, bumblebees, and butterflies among others. The trophic habits of Barn Owls along this gradient were mostly similar to those reported in other studies in southern South America, where the main prey items were native rodents and food niche breadth values (measured at the level of Orders) were low. Western Barn Owls in our study maintained specialization as a micromammal predator. © 2012 by the Wilson Ornithological Society. Fil:Cueto, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15594491_v124_n3_p589_Teta http://hdl.handle.net/20.500.12110/paper_15594491_v124_n3_p589_Teta
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	bee butterfly diet geographical variation invasive species lizard native species niche breadth periurban area predator prey capture raptor rodent rural area specialization urban area urbanization Argentina Amphibia Aves Mammalia Muridae Papilionoidea Rodentia Squamata Strigiformes Tyto alba Tytonidae Vertebrata
spellingShingle	bee butterfly diet geographical variation invasive species lizard native species niche breadth periurban area predator prey capture raptor rodent rural area specialization urban area urbanization Argentina Amphibia Aves Mammalia Muridae Papilionoidea Rodentia Squamata Strigiformes Tyto alba Tytonidae Vertebrata Cueto, Gerardo Ruben Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
topic_facet	bee butterfly diet geographical variation invasive species lizard native species niche breadth periurban area predator prey capture raptor rodent rural area specialization urban area urbanization Argentina Amphibia Aves Mammalia Muridae Papilionoidea Rodentia Squamata Strigiformes Tyto alba Tytonidae Vertebrata
description	We studied geographic variation in the diet of Western Barn Owls (Tyto alba) along a urban-rural gradient in central-eastern Argentina and identified 5,231 prey items. Mammals were present in all samples, whereas birds and amphibians were present in 79.1 and 50.0% of the samples, respectively. There were significant differences in vertebrate assemblages consumed by Barn Owls at the opposite extremes of the gradient. Native sigmodontine rodents comprised 85.8 of the total prey items, especially towards periurban and rural areas. Exotic murid rodents were the main prey item in urban sites, while birds increased in frequency in urban and periurban areas. Food niche breadth and standardized food niche breadth values were higher at intermediate levels of urbanization (= periurban). This 'periurban peak' in species diversity is a relatively well-known pattern, previously reported for taxa such as birds, lizards, bumblebees, and butterflies among others. The trophic habits of Barn Owls along this gradient were mostly similar to those reported in other studies in southern South America, where the main prey items were native rodents and food niche breadth values (measured at the level of Orders) were low. Western Barn Owls in our study maintained specialization as a micromammal predator. © 2012 by the Wilson Ornithological Society.
author	Cueto, Gerardo Ruben
author_facet	Cueto, Gerardo Ruben
author_sort	Cueto, Gerardo Ruben
title	Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
title_short	Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
title_full	Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
title_fullStr	Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
title_full_unstemmed	Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient
title_sort	variation in the diet of western barn owls (tyto alba) along an urban-rural gradient
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15594491_v124_n3_p589_Teta http://hdl.handle.net/20.500.12110/paper_15594491_v124_n3_p589_Teta
work_keys_str_mv	AT cuetogerardoruben variationinthedietofwesternbarnowlstytoalbaalonganurbanruralgradient
_version_	1768541912292130816

Variation in the diet of Western Barn Owls (Tyto alba) along an urban-rural gradient

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