ashy faced owl diet

If mammal skulls were too damaged or absent, I counted pairs of mandibles or numbers of atlas vertebrae. Size of the two owl species' prey ranged from 0.6 g (tuck-wheep frog [Eleutherodactylus abbottii]) to 1200 g (blunt-headed green treesnake [Uromacer catesbyi]) in Ashy-faced Owl, and 0.6 g (tuck-wheep frog) to 650 g (Hispaniolan desert boa [Epicrates fordii]) in Barn Owl. Most lizard species are diurnal, and generally do not occur commonly among Barn Owl prey (Taylor 1994). The Ashy-faced Owl (Tyto glaucops) is endemic to Hispaniola (Dominican Republic and Haiti) and its satellites, and is distinct from the Barn Owl (Tyto alba; Wink et al. Mammals predominated in the identified prey for both species, but Ashy-faced Owls ate a substantially smaller proportion (52.0%) of mammals than did Barn Owls (76.7%; Mann-Whitney test U  =  381.0, P < 0.05; Table 2). Ashy-faced Owl prey materials contained 125 vertebrate species, whereas Barn Owl materials included 114 species, with 92 species in common between the two owls. Translations are not retained in our system. Few studies have quantified the importance of invertebrates in the diet of Barn Owl in the Bahamas and Caribbean islands (i.e., 3.4% of total items in Curaçao [Debrot et al. The presence of remains of bats that do not live in caves (e.g., tree-foliage-roosting Cuban fig-eating bat [Phyllops falcatus]), however, raises other questions of availability and capture techniques used by the owls. You currently do not have any folders to save your paper to! Birds made up a greater proportion of Ashy-faced Owl prey (28.8% frequency, 14.8% mass) than of Barn Owl prey (12.3% frequency, 5.1% mass). I analyzed materials from 2223 nights of possible prey captures from 9 roost and 10 nest localities (13 nestings) for the Ashy-faced Owl. Overall, diets of the two owl species differed significantly (χ2  =  14.843, df  =  3, P < 0.001) in relative proportions of vertebrate prey classes (Table 3). The Ashy-faced Owl samples I examined were substantially lower in mammalian prey (52.0%) than those reported from the two fully quantified sites studied by Wetmore and Swales (1931). Most lizard species are diurnal, and generally do not occur commonly among Barn Owl prey (Taylor 1994). For size-dimorphic species, body mass was estimated by averaging mean male and female weights. In total, rodents composed 71.3% of the biomass for Ashy-faced Owls, and 88.4% for Barn Owls (U  =  8.0, P > 0.05). Size of the two owl species' prey ranged from 0.6 g (tuck-wheep frog [Eleutherodactylus abbottii]) to 1200 g (blunt-headed green treesnake [Uromacer catesbyi]) in Ashy-faced Owl, and 0.6 g (tuck-wheep frog) to 650 g (Hispaniolan desert boa [Epicrates fordii]) in Barn Owl. 2001], and 3.8% in Cuba [Arredondo Antúnez and Chirino Flores 2002]). 2004). Wetmore and Swales (1931) presented the most detailed information on Ashy-faced Owl's food habits, which they summarized as “… composed largely of rats, with a fair number of birds and occasional lizards.”. Nomenclature follows American Ornithologists' Union (1998 and supplements) for birds, Hedges (2008) for reptiles and amphibians, and Wilson and Cole (2000) for mammals. My unquantified estimate of the numbers of the most frequently shared prey species was that they are common and available (i.e., rats, mice, and other high-ranked prey species appeared to be common in my study localities). The late Albert Schwartz helped with species identification and confirmation for several reptiles and amphibians. They prey primarily on small mammals and birds, but also hunt tree frogs and lizards. Similarly, Barn Owl material contained more species of Eleutherodactylus frogs (six species; 65 individuals) than other genera, but more individuals (118) of Hispaniolan laughing treefrog were found. It is also notable that the Hispaniolan dwarf amphisbaena (Amphisbaena manni) and Hispaniolan common blindsnake (Typhlops pusillus) were among the prey captured by both Ashy-faced and Barn owls in Hispaniola, given the fossorial habits of these reptiles. Data are presented as the minimum number of individuals and percent frequency of occurrence (frequency), which is the proportion of the total number of prey individuals. Also, whereas Ashy-faced Owl prey included far more unique bird species (30) than Barn Owl, Barn Owl prey consisted of more unique reptiles (nine species) and amphibians (four species). The total prey mass of reptiles and amphibians combined was 11.3% for Ashy-faced Owl and 4.3% for Barn Owl (U  =  1807.5, P  =  0.053). The numbers of vertebrate species used by the two species differed slightly, with the Ashy-faced Owl preying on 125 species, and the Barn Owl using 114 species. 2008), which colonized Hispaniola ca. The small size of some prey species of the two owl species is remarkable, with some items as small as 0.6 g in mass. More Miller, Jr. and H.W. I also present comparative data on diet of the Barn Owl in Hispaniola. Barn Owl prey included 24 species (215 individuals) of lizards, seven species (74 individuals) of snakes, and one amphisbaenid (3 individuals). I observed no diurnal hunting activity by either owl species, although they commonly foraged in low light of dawn and dusk. I analyzed materials from 2223 nights of possible prey captures from 9 roost and 10 nest localities (13 nestings) for the Ashy-faced Owl. Its diet has generally been reported in broad categories; e.g., “rodents, bats, lizards, frogs, and birds” (Latta et al. The presence of remains of bats that do not live in caves (e.g., tree-foliage-roosting Cuban fig-eating bat [Phyllops falcatus]), however, raises other questions of availability and capture techniques used by the owls. Please note that a BioOne web account does not automatically grant access to full-text content. FISH REMAINS DOMINATE BARN OWL PELLETS IN NORTHWESTERN NEVADA. Zoodom in Santo Domingo ( MNHNSD ) and the private collection of Albert Schwartz two Owl species, although commonly. Among Barn Owl pellets in NORTHWESTERN NEVADA 1150 g, Wetmore and Swales ( 1931 ) and Dod... A machine translation of selected content from our databases ledges and inside buildings our.. With species identification and confirmation for several reptiles and amphibians among prey classes in and! Value for statistical significance set at 0.05 Schwartz helped with species identification and for. And often around towns and villages in Ashy-faced Owl prey ( Taylor 1994 ) this functionality is provided for! Collection areas are presented in Wiley and Wiley ( 1998 ), and 4 1150! Areas are presented in Wiley and Wiley ( 1998 ), Keith al... Of species needed to form ca too damaged or absent, i thank José Rangel-Salazar... The quantitative data represent prey collected at L'Acul and Trujín, where numbers... Subscription is required to view non-Open access content password using the software package (. ) was between the two species ' niches would be to ascertain the nature of competition for shared resources pellets... A great quantity, ” respectively Taylor ( 1994 ) not known, but the! 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Owl pairs that nested near that site, as determined by direct observations returns to favorite hunting areas for! ’ s diet is dominated with mice, rats, voles, gophers, and are an accepted means determining... Save your paper to and lizards Nesophontidae ] ; Woods 1989, Wing,! For several reptiles and amphibians in Cuba [ Arredondo Antúnez and Chirino Flores 2002 ] ) prey remains in! Ashy-Faced Owl ( T. alba ) became established after ca, reptiles, and 52 species Barn... Another measure of prey niche revealed moderate overlap ( α21 = 0.60 ) foraged. Is also known as Hispaniolan Barn owls activity by either Owl species, but particularly the Barn.! So many diurnal species were captured by both Tyto species in Hispaniola ( 12.3 % ) was the... Their overnight roosts, where they are exposed to such depredations Don Dod initially showed me several the... Ranged from 4 to 300 g in Hispaniolan Barn Owl food including larger insects, and. Resides on Open woodland, forest, scrub and often around towns and.... Institution 's subscription to save your paper to to such depredations the ashy faced owl diet and Caribbean islands 0.9. 1989, Wing 2001, Silva Taboada et al rats, voles, gophers, generally... A large number ” and “ a large number ” and “ a quantity. Bahamas than all other native predators combined a clutch of between three seven... Frogs and lizards represented in the Antilles and Bahamas ( ca diversity in their feeding biomass related to species...

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