Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico

Abstract Background The long-eared owl (Asio otus) has a Holarctic distribution, including much of North America. This nocturnal species is considered to be extremely secretive, and poorly known in the Great Plains of the United States and Canada, as well as to México, where no previous studies on...

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Autores principales:	González-Rojas,José I., Padilla-Rangel,Hernaldo, Ruvalcaba-Ortega,Irene, Cruz-Nieto,Miguel A., Canales-del-Castillo,Ricardo, Guzmán-Velasco,Antonio
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2017
Materias:	Winter diet Long-eared owl Grasslands Janos México
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100401
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spelling	oai:scielo:S0716-078X20170001004012017-07-04Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, MexicoGonzález-Rojas,José I.Padilla-Rangel,HernaldoRuvalcaba-Ortega,IreneCruz-Nieto,Miguel A.Canales-del-Castillo,RicardoGuzmán-Velasco,Antonio Winter diet Long-eared owl Grasslands Janos México Abstract Background The long-eared owl (Asio otus) has a Holarctic distribution, including much of North America. This nocturnal species is considered to be extremely secretive, and poorly known in the Great Plains of the United States and Canada, as well as to México, where no previous studies on its diet have been conducted. Findings We analyzed 120 pellets collected during January 2007 in roosts in a 2-3 m height mesquite scrub within a grassland area of Reserva Ecológica El Uno, located in the Natural Protected Area Janos. We registered and identified three orders, four families, eight genera and ten species of mammals and two orders and one family of insects. Winter diet is dominated by mammals, especially rodents in both frequency and biomass. Cricetidae and Perognathus flavus were the most frequent family and species, respectively. On the other hand, when analyzing biomass, Sigmodon species were dominant, achieving almost 70% of the consumed biomass. Levin's standardized niche breath based on frequency was calculated as 0.40, while based on biomass was 0.38. Also, two previously unrecorded rodent species were identified as long-eared owl prey. Conclusion Although 18 different types of items were identified, the long-eared owl tends to be selective, with a single genera (Sigmodon) comprising almost 70% of its consumed biomass during winter. Perognathus flavus was also important in frequency (21%); however, it barely constitutes 2% of the consumed biomass.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.90 20172017-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100401en10.1186/S40693-017-0064-3
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Winter diet Long-eared owl Grasslands Janos México
spellingShingle	Winter diet Long-eared owl Grasslands Janos México González-Rojas,José I. Padilla-Rangel,Hernaldo Ruvalcaba-Ortega,Irene Cruz-Nieto,Miguel A. Canales-del-Castillo,Ricardo Guzmán-Velasco,Antonio Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
description	Abstract Background The long-eared owl (Asio otus) has a Holarctic distribution, including much of North America. This nocturnal species is considered to be extremely secretive, and poorly known in the Great Plains of the United States and Canada, as well as to México, where no previous studies on its diet have been conducted. Findings We analyzed 120 pellets collected during January 2007 in roosts in a 2-3 m height mesquite scrub within a grassland area of Reserva Ecológica El Uno, located in the Natural Protected Area Janos. We registered and identified three orders, four families, eight genera and ten species of mammals and two orders and one family of insects. Winter diet is dominated by mammals, especially rodents in both frequency and biomass. Cricetidae and Perognathus flavus were the most frequent family and species, respectively. On the other hand, when analyzing biomass, Sigmodon species were dominant, achieving almost 70% of the consumed biomass. Levin's standardized niche breath based on frequency was calculated as 0.40, while based on biomass was 0.38. Also, two previously unrecorded rodent species were identified as long-eared owl prey. Conclusion Although 18 different types of items were identified, the long-eared owl tends to be selective, with a single genera (Sigmodon) comprising almost 70% of its consumed biomass during winter. Perognathus flavus was also important in frequency (21%); however, it barely constitutes 2% of the consumed biomass.
author	González-Rojas,José I. Padilla-Rangel,Hernaldo Ruvalcaba-Ortega,Irene Cruz-Nieto,Miguel A. Canales-del-Castillo,Ricardo Guzmán-Velasco,Antonio
author_facet	González-Rojas,José I. Padilla-Rangel,Hernaldo Ruvalcaba-Ortega,Irene Cruz-Nieto,Miguel A. Canales-del-Castillo,Ricardo Guzmán-Velasco,Antonio
author_sort	González-Rojas,José I.
title	Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
title_short	Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
title_full	Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
title_fullStr	Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
title_full_unstemmed	Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
title_sort	winter diet of the long-eared owl asio otus (strigiformes: strigidae) in the grasslands of janos, chihuahua, mexico
publisher	Sociedad de Biología de Chile
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100401
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Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico

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