Data/hora: 02/06/2024 16:30:34

Provedor de dados: | 97
País: | Chile
Título: | Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
Autores: | González-Rojas,José I.; Padilla-Rangel,Hernaldo; Ruvalcaba-Ortega,Irene; Cruz-Nieto,Miguel A.; Canales-del-Castillo,Ricardo; Guzmán-Velasco,Antonio.
Data: | 2017-01-01
Ano: | 2017
Palavras-chave: | Winter diet; Long-eared owl; Grasslands; Janos; México.
Resumo: | 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.
Tipo: | Journal article
Idioma: | Inglês
Identificador: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2017000100401
Editor: | Sociedad de Biología de Chile
Formato: | text/html
Fonte: | Revista chilena de historia natural  v.90 2017