Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico
Tóm tắt
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. 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. 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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Tài liệu tham khảo
Marti CD. A review of prey selection by the long-eared owl. Condor. 1976;78:331–6.
Holt DW. The long-eared owl (Asio otus) and forest management: a review of the literature. J Raptor Res. 1997;31:175–86.
Khalafalla SM, Iudica CA. Barn and long-eared owl diets: a comparative study from Central Pennsylvannia and a key for identification of prey items. Northeast Nat. 2010;17:147–54.
Schueler FW. A new method of preparing owl pellets: boiling in NaOH. Bird Band. 1972;43:142.
Anderson S. Mammals of Chihuahua taxonomy and distribution. Bull Amer Mus Nat Hist. 1972;148:149–10.
Roest AI. A key-guide to mammal skulls and lower jaws. Eureka: Mad River Press, Inc; 1991.
Wilson DE, Reeder DM (eds). Mammal Species of the World, a taxonomic and geographic reference, 3rd ed. Baltimore: John Hopkins University Press; 2005.
Borror DJ, Triplehorn CA, Johnson NF. An Introduction to the Study of Insects. 6th ed. Pacific Grove: Brooks/Cole Thomson Learning; 1989.
Márquez OM. Determinación de la dieta del tecolote moteado mexicano (Strix occidentalis lucida) en Sierra Fría, Aguascalientes. Anales Inst Biol Univ Nac Autón Méx Ser Zool. 2002;73:205–71.
Ceballos G, Arroyo CJ, Medellín RA, Medrano GL, Oliva G. Diversidad y conservación de los mamíferos de México. In: Ceballos, G. y G. Oliva (coordinadores). Los mamíferos silvestres de México. Ciudad de México: CONABIO Fondo de Cultura Económica; 2005. p. 21-7.
Holt DW, Childs NN. Non-Breeding season diet of long-eared owls in Massachusetts. J Raptor Res. 1991;25:23–4.
Hurlbert SH. The measurement of niche overlap and some relatives. Ecology. 1978;59:67–77.
Levins R. Evolution in changing environments: some theoretical explorations. Princeton: Princeton University Press; 1968.
Krebs CJ. Ecological methodology. 2nd ed. Menlo Park: Benjamin Cummings; 1999.
Birrer S. Synthesis of 312 studies on diet of the long-eared owl Asio otus. Ardea. 2009;97:615–24.
Marti CD. Feeding ecology of four sympatric owls. Condor. 1974;76:45–61.
Kaufman DW, Kaufman GA, Brillhart DE. Small mammals as winter prey of long-eared owls in Kansas. Trans Kans Acad Sci. 2010;113:217–22.
Maser C, Hammer EW, Anderson SH. Comparative food habits of three owls species in central Oregon. Murrelet. 1970;51:29–33.
Barrows CW. Diets of five species desert owls. Western Birds. 1989;20:1–10.
Brown NL. Notes of the winter roost and diet of long-eared owls in the Sonora Desert. J Raptor Res. 1995;29:277–9.
Marks JS. Feeding ecology of breeding long-eared owls in southwestern Idaho. Can J Zool. 1984;62:1528–33.
Craig TH, Craig EH, Powers LR. Food habits of long-eared owls (Asio otus) at a communal roost site during nest season. Auk. 1985;102:193–5.
Rainey DG, Robinson TS. Food of the long-eared owl in Douglas County, Kansas. Trans Kans Acad Sci. 1954;51:206–7.
Noland RL, Maxwell TC, Dowler RC. Food habits of long-eared owls (Asio otus) at a winter communal roost in Texas. Southwest Nat. 2013;58:245–7.
Lange KI, Mikita JR. Mammals remains from owl pellets in Arizona. J Mammal. 1959;40:607.
Stophlet JJ. Nesting concentration of long-eared owls in Cochise County, Arizona. Wilson Bull. 1959;71:97–9.
Whitford WG. Temporal fluctuations in density and diversity of desert rodent populations. J Mammal. 1976;57:351–69.
Brown JH, Zeng Z. Comparative population ecology of eleven species of rodents in the Chihuahuan Desert. Ecology. 1989;70:1507–25.
Marti CD, Marks JS, Craig TH, Craig EH. Long-eared owl diet in northwestern New Mexico. Southwest Nat. 1986;31:416–9.
Korschgen LJ, Stuart HB. Twenty years of avian predator-small mammal relationships in Missouri. J Wildlife Manage. 1972;36:269–82.
Pacheco J, Ceballos G, List R. Los mamíferos de la región de Janos-Casas Grandes, Chihuahua, México. Rev Mex Masto. 1999-2000;4:69–83.
Bradley WG, Cockrum EL. A new subspecies of the meadow vole (Microtus pennsylvanicus) for north-west Chihuahua, México. Am Mus Novit. 1968;2325:1–7.
Smith DG, Devine A. Winter ecology of the long-eared owl in Connecticut. Conn Warbler. 1993;13:45–53.
Coyle M. Prey items of long-eared owl wintering in Minnesota. Loon. 1995;67:238–40.
Marks JS, Evans DL, Holt DW. Long-eared owl (Asio otus). In: Poole A, editor. The Birds of North America Online. 1994. doi:10.2173/bna.133. http://bna.birds.cornell.edu/bna/species/133. Accessed 8 Dec 2015.