Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina

We studied the dietary niche of the Barn Owl (Tyto alba) in temperate agroecosystems of central Argentina by describing seasonal and geographic variation in the food habits of this owl in four districts of the Pampean region (Flooding, Inland, Rolling, and Southern Pampas). We identified 21,925 prey...

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Detalles Bibliográficos
Autores principales: González Fischer, Carlos María, Codesido, Mariano, Bilenca, David Norberto
Publicado: 2011
Materias:
Bam owl
Buenos aires
Cricetidae
Food-niche breadth
Pampean region
Small mammals
Tyto alba
Tytonidae
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10754377_v22_n2_p295_GonzalezFischer
http://hdl.handle.net/20.500.12110/paper_10754377_v22_n2_p295_GonzalezFischer
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_10754377_v22_n2_p295_GonzalezFischer
record_format dspace
spelling paper:paper_10754377_v22_n2_p295_GonzalezFischer2023-06-08T16:05:16Z Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina González Fischer, Carlos María Codesido, Mariano Bilenca, David Norberto Bam owl Buenos aires Cricetidae Food-niche breadth Pampean region Small mammals Tyto alba Tytonidae We studied the dietary niche of the Barn Owl (Tyto alba) in temperate agroecosystems of central Argentina by describing seasonal and geographic variation in the food habits of this owl in four districts of the Pampean region (Flooding, Inland, Rolling, and Southern Pampas). We identified 21,925 prey items from samples of fresh pellets collected in summer (n = 23) and winter (n = 26). Mammals,' mostly sigmodontine rodents, were the main prey items (91.9%), followed by amphibians (6.5%) and birds (1.6%). Arthropods were also a common prey item (found in 45% of the samples). The consumption of arthropods and amphibians was higher in summer than in winter, indicating that seasonal changes in prey abundances are reflected in the Barn Owl diet. We found no differences in food-niche breadth among the four study districts, but food-niche breadth varied between seasons, being higher during summer. Six rodent species were common to all districts: Calomys spp., Akodon azarae, Oligoryzomys flavescens, Mus musculus, Rattus spp., and Holochilus brasiliensis. Calomys spp. was numerically dominant in 46 of the 49 samples, and together with A. azarae and O. flavescens comprised the bulk of the diet (> 80%). Predation on rodents may reflect population dynamics of the prey species with high predation rates when peaks in abundance of sigmodontine rodents occurred (autumn-winter). © The Neotropical Ornithological Society. Fil:González-Fischer, C.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Codesido, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bilenca, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10754377_v22_n2_p295_GonzalezFischer http://hdl.handle.net/20.500.12110/paper_10754377_v22_n2_p295_GonzalezFischer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bam owl
Buenos aires
Cricetidae
Food-niche breadth
Pampean region
Small mammals
Tyto alba
Tytonidae
spellingShingle Bam owl
Buenos aires
Cricetidae
Food-niche breadth
Pampean region
Small mammals
Tyto alba
Tytonidae
González Fischer, Carlos María
Codesido, Mariano
Bilenca, David Norberto
Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
topic_facet Bam owl
Buenos aires
Cricetidae
Food-niche breadth
Pampean region
Small mammals
Tyto alba
Tytonidae
description We studied the dietary niche of the Barn Owl (Tyto alba) in temperate agroecosystems of central Argentina by describing seasonal and geographic variation in the food habits of this owl in four districts of the Pampean region (Flooding, Inland, Rolling, and Southern Pampas). We identified 21,925 prey items from samples of fresh pellets collected in summer (n = 23) and winter (n = 26). Mammals,' mostly sigmodontine rodents, were the main prey items (91.9%), followed by amphibians (6.5%) and birds (1.6%). Arthropods were also a common prey item (found in 45% of the samples). The consumption of arthropods and amphibians was higher in summer than in winter, indicating that seasonal changes in prey abundances are reflected in the Barn Owl diet. We found no differences in food-niche breadth among the four study districts, but food-niche breadth varied between seasons, being higher during summer. Six rodent species were common to all districts: Calomys spp., Akodon azarae, Oligoryzomys flavescens, Mus musculus, Rattus spp., and Holochilus brasiliensis. Calomys spp. was numerically dominant in 46 of the 49 samples, and together with A. azarae and O. flavescens comprised the bulk of the diet (> 80%). Predation on rodents may reflect population dynamics of the prey species with high predation rates when peaks in abundance of sigmodontine rodents occurred (autumn-winter). © The Neotropical Ornithological Society.
author González Fischer, Carlos María
Codesido, Mariano
Bilenca, David Norberto
author_facet González Fischer, Carlos María
Codesido, Mariano
Bilenca, David Norberto
author_sort González Fischer, Carlos María
title Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
title_short Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
title_full Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
title_fullStr Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
title_full_unstemmed Seasonal and geographic variation in the diet of barn owls (Tyto Alba) in temperate agroecosystems of Argentina
title_sort seasonal and geographic variation in the diet of barn owls (tyto alba) in temperate agroecosystems of argentina
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10754377_v22_n2_p295_GonzalezFischer
http://hdl.handle.net/20.500.12110/paper_10754377_v22_n2_p295_GonzalezFischer
work_keys_str_mv AT gonzalezfischercarlosmaria seasonalandgeographicvariationinthedietofbarnowlstytoalbaintemperateagroecosystemsofargentina
AT codesidomariano seasonalandgeographicvariationinthedietofbarnowlstytoalbaintemperateagroecosystemsofargentina
AT bilencadavidnorberto seasonalandgeographicvariationinthedietofbarnowlstytoalbaintemperateagroecosystemsofargentina
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