I found considerable difference between Ashy-faced and Barn owl diets in Hispaniola. In addition, several species of diurnal Hispaniolan lizards have subterranean overnight retreats, making them even less likely to be available as nocturnal owl prey; e.g., Ameiva enter their underground retreats in the mid- to late afternoon and do not emerge until midmorning of the next day. Prey remains and pellets from 2530 nights at 11 roosts and 6 nests (8 nestings) were analyzed for the Barn Owl. Ashy-faced Owls preyed on 15 species (210 individuals) of lizards, most of which were anoles (Anolis: seven species, 121 individuals), seven species of snakes (85 individuals), and one species of amphisbaenid (1 individual; Table 2). 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. The proportion of reptiles and amphibians (11.1%) in Barn Owl samples from Hispaniola was slightly greater than the extremes reported (0.8–7.4%; Buden 1974, Arredondo Antúnez and Chirino Flores 2002) in the region. I found considerable difference between Ashy-faced and Barn owl diets in Hispaniola. Luis Amiama, John Lingebach (deceased), Marcia Beltre, Francia de la Cruz A., Juana Peña, and Carlos Sanlley helped in accessing specimens in the MNHN and in identifying specimens. Bond (1977) suggested that Barn Owls capture more land birds in the Antilles and Bahamas than all other native predators combined. 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). José A. Ottenwalder and Simón Guerrera provided facilities at Zoodom in Santo Domingo. 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). Prey remains and pellets were collected from two habitats (dry scrub/coastal woodland and montane broadleaf evergreen forest) shared by Ashy-faced and Barn owls. For allowing me to use laboratory space and to access the specimen collections, I thank the Directors of the Museo Nacional de Historia Natural in Santo Domingo, including Francisco A. Ortega Ventura, Eugenio de Jesús Marcano, Fernando Luna Calderón (deceased), and Carlos M.L. 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). I also present comparative data on diet of the Barn Owl in Hispaniola. 6–9 g, Wetmore and Swales 1931) and Barn Owls in the Antilles and Bahamas (ca. I found a ratio of 152 house rats to one brown rat in Barn Owl prey in Hispaniola, which was similar to Buden's (1974) ratio of 116 house rats to one brown rat in Barn Owl prey in the southern Bahamas. and insectivore mammals (e.g., Nesophontes [family Nesophontidae]; Woods 1989, Wing 2001, Silva Taboada et al. In the Hispaniolan populations, these characteristics were true of both species, but particularly the Barn Owl. Part of the difference between prey proportions in the two owl species is explained by the greater number of bird species used as prey by the Ashy-faced Owl compared with the Barn Owl (78 vs. 52). Miller, Jr. and H.W. I observed no diurnal hunting activity by either owl species, although they commonly foraged in low light of dawn and dusk. 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.”. Owl diets differed among prey classes in frequency and biomass. (2006). 2002). All prey diversity indices suggested that the Ashy-faced Owl has a broader feeding niche than does the Barn Owl, though both species showed remarkable breadth in prey species used. 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 smallest (<10 g) items were rare in the diet of both species in my samples, forming 5.0% (<0.1% of biomass) of items for Ashy-faced Owl and 4.3% (0.1% of biomass) for Barn Owl. (2003), and 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. You currently do not have any folders to save your paper to! An institutional or society member subscription is required to view non-Open Access content. 4–6 g, Bond 1977). You have requested a machine translation of selected content from our databases. Ashy-faced Owl is vulnerable to … (2006). At the other two sites, where mammal remains were quantified, mammals formed 67.4% and 94.1%, respectively, of the Ashy-faced Owl prey items. All bat species combined made up a total of 2.6% of the prey biomass for Ashy-faced Owls, and 2.2% for Barn Owls (U = 271.0, P > 0.05). Birds were second in importance, by total biomass, in materials for both owl species, with that class making up 14.8% of the mass for Ashy-faced Owl, and 5.1% for Barn Owl (U = 7792.5, P < 0.001; Table 2). Bond (1977) suggested that Barn Owls capture more land birds in the Antilles and Bahamas than all other native predators combined. 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. Numbers of individuals (frequency) and biomass of prey of Ashy-faced Owl (Tyto glaucops) and Barn Owl (T. alba) as determined from regurgitated pellets and food remains collected at nests and roosts at 12 localities, Dominican Republic, 1975–2004. Contact, Password Requirements: Minimum 8 characters, must include as least one uppercase, one lowercase letter, and one number or permitted symbol, Access Institutional Sign In via Shibboleth or OpenAthens, Prey Characteristics for Ashy-faced and Barn Owls, Arredondo Antúnez and Chirino Flores 2002, Arredondo Antúnez and Chirino Flores (2002).
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