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Dartora F. - One of the best experts on this subject based on the ideXlab platform.
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Evidence of carrion consumption behaviour in the long-eared owl Asio otus (Linnaeus, 1758) (Aves: Strigiformes: Strigidae)
'Informa UK Limited', 2014Co-Authors: Mori E., Menchetti M., Dartora F.Abstract:Evidence of necrophagous behaviour has been reported for 8.43% of nocturnal raptors. To determine whether preys were captured alive or consumed as carrion is challenging, as the diet of Strigiformes is mainly studied through pellet analysis, rather than direct observation. The diet of the long-eared owl Asio otus has been widely studied all over the distribution range of this species, but proven evidence of this feeding habit is still lacking. We collected 106 pellets under a suburban dormitory in Southern Tuscany (Central Italy) between December 2012 and April 2013. Prey remains (skulls, mandibles) were compared with a specific atlas. Four fragments of crested porcupine (Hystrix cristata) quills and a jawbone of Martes sp. were found in pellets collected after a snowfall (20-40 cm in depth). Although voles and mice constituted the staple of the diet of this species, accordingly with previous studies, these findings represent the first proof of carrion consumption by the long-eared owl. Body sizes of crested porcupine and Martes sp, as well as the defence behaviour of the rodent, rule out a direct predation by the owl. Our study enlarges the trophic spectrum of the long-eared owl, thus adding a further dimension to the behavioural plasticity of this species. © 2014 © 2014 Unione Zoologica Italiana
F Dartora - One of the best experts on this subject based on the ideXlab platform.
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evidence of carrion consumption behaviour in the long eared owl Asio otus linnaeus 1758 aves strigiformes strigidae
Italian Journal of Zoology, 2014Co-Authors: Emiliano Mori, Mattia Menchetti, F DartoraAbstract:AbstractEvidence of necrophagous behaviour has been reported for 8.43% of nocturnal raptors. To determine whether preys were captured alive or consumed as carrion is challenging, as the diet of Strigiformes is mainly studied through pellet analysis, rather than direct observation. The diet of the long-eared owl Asio otus has been widely studied all over the distribution range of this species, but proven evidence of this feeding habit is still lacking. We collected 106 pellets under a suburban dormitory in Southern Tuscany (Central Italy) between December 2012 and April 2013. Prey remains (skulls, mandibles) were compared with a specific atlas. Four fragments of crested porcupine (Hystrix cristata) quills and a jawbone of Martes sp. were found in pellets collected after a snowfall (20–40 cm in depth). Although voles and mice constituted the staple of the diet of this species, accordingly with previous studies, these findings represent the first proof of carrion consumption by the long-eared owl. Body sizes...
Jose I Gonzalezrojas - One of the best experts on this subject based on the ideXlab platform.
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winter diet of the long eared owl Asio otus strigiformes strigidae in the grasslands of janos chihuahua mexico
Revista Chilena de Historia Natural, 2017Co-Authors: Jose I Gonzalezrojas, Irene Ruvalcabaortega, Hernaldo Padillarangel, Miguel A Cruznieto, Ricardo Canalesdelcastillo, Antonio GuzmanvelascoAbstract: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 Mexico, where no previous studies on its diet have been conducted. We analyzed 120 pellets collected during January 2007 in roosts in a 2–3 m height mesquite scrub within a grassland area of Reserva Ecologica 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. 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.
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first nesting record of the long eared owl Asio otus for chihuahua mexico
Southwestern Naturalist, 2014Co-Authors: Irene Ruvalcabaortega, Maria Magdalena Salinasrodriguez, Javier Cruznieto, Jose I GonzalezrojasAbstract:Abstract We found two nests of the long-eared owl (Asio otus) in Reserva Ecologica el Uno, located in Janos municipality, Chihuahua, Mexico. Contents of nests were recorded, photographed, and monitored between 28 March and 10 June 2007. Nests were constructed on honey mesquites (Prosopis glandulosa) and contained three eggs and three nestlings, respectively. These nests represent the first confirmed breeding record for the state of Chihuahua and the second for Mexico (outside Baja California).
Abolghasem Khaleghizadeh - One of the best experts on this subject based on the ideXlab platform.
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population increase of the long eared owl Asio otus linnaeus 1758 in iran aves strigidae
Zoology in The Middle East, 2015Co-Authors: Abolghasem Khaleghizadeh, Mohammad Tohidifar, Seyed Babak Musavi, Alireza Hashemi, Ali Khani, Maryam OmidiAbstract:The Long-eared Owl, Asio otus (Linnaeus, 1758), was known as a scarce wintering bird in Iran until 2010. There were altogether 25 records until the 1970s, but no data are available for the period between the 1970s and 1997. Between 1997 and 2014 there were at least 32 non-breeding and 17 breeding records available based on data of the Iran Bird Records Committee. Breeding was first confirmed in Nahavand (Hamedan Province) and has in the meantime been confirmed at 11 localities mainly in the western half of the country. The recent increase in records (from 25 records during 12 decades compared with 49 records during two decades) indicates that there has been a real increase in the numbers of Long-eared Owls occurring in Iran.
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diet of wintering long eared owl Asio otus in zabol southeastern iran
Ardea, 2009Co-Authors: Abolghasem Khaleghizadeh, Tayebeh Arbabi, Gholamreza Noori, Mohammad Javidkar, Alireza ShahriariAbstract:We examined 250 pellets of Long-eared Owls Asio otus in 2006 and 2007 from winter roost sites in southeastern Iran. In contrast to the diet of wintering owls (e.g. mainly small mammals) reported elsewhere in the world, the diet of wintering Long-eared Owls at Zabol was predominantly larger rodents (c. 150 g). Specifically, big-size rodents, including the Indian Gerbil Tatera indica, and a Bandikoot Rat Nesokia indica made up 72.9% of the total biomass in the diet of the owls at Zabol. In addition to small mammal and bird species found in Long-eared Owl pellets from other regions, we found Meriones spp. and Gerbillus spp. (both are types of Gerbils) that, thus far, had not been reported in the diet of this owl.
Weidong Bao - One of the best experts on this subject based on the ideXlab platform.
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bats as the main prey of wintering long eared owl Asio otus in beijing integrating biodiversity protection and urban management
Integrative Zoology, 2015Co-Authors: Long Tian, Xuwei Zhou, Yang Shi, Yumin Guo, Weidong BaoAbstract:The loss of biodiversity from urbanized areas is a major environmental problem challenging policy-makers throughout the world. Solutions to this problem are urgently required in China. We carried out a case study of wintering long-eared owls (Asio otus) and their main prey to illustrate the negative effects of urbanization combined with ineffective conservation of biodiversity in Beijing. Field monitoring of owl numbers at two roosting sites from 2004 to 2012 showed that the owl population had fallen rapidly in metropolitan Beijing. Analysis of pellet contents identified only seven individuals of two species of shrew. The majority of mammalian prey comprised four bat and seven rodent species, making up 29.3% and 29.5% of the prey items, respectively. Prey composition varied significantly among years at the two sample sites. At the urban site the consumption of bats and rodents declined gradually over time, while predation on birds increased. In contrast, at the suburban site the prey composition showed an overall decrease in the number of bats, a sharp increase and a subsequent decrease in bird prey, and the number of rodent prey fell to a low point. Rapid development of real estate and inadequate greenfield management in city parks resulted in negative effects on the bird and small mammal habitat of urban areas in Beijing. We suggest that measures to conserve biodiversity should be integrated into future urban planning to maintain China's rich biodiversity while also achieving sustainable economic development.
