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This dataset depicts Mexican Spotted Owl sites (as polygons) digitized by the Conservation Biology Institute (CBI) from maps contained in the "Draft Recovery Plan for the Mexican Spotted Owl, First Revision" (2011). Points were depicted within the maps that were digitized, but centroids could not be determined accurately. Thus boundaries of point symbols in maps were used to digitize polygon boundaries. Caution should be exercised using these areas due to the coarse scale of this dataset. Original data should be obtained directly from the USFWS. This dataset was digitized for the BLM REA process due to the lack of available quality data for Mexican Spotted Owl areas within the Colorado Plateau ecoregion. This dataset...
We studied Mexican spotted owl (Strix occidentalis lucida) diets and the relative abundance and habitat associations of major prey species in a ponderosa pine (Pinus ponderosa)-Gambel oak (Quercus gambelii) forest in north-central Arizona, USA, from 1990 to 1993. The owl's diet was comprised of 94% mammals by biomass and consisted of primarily the deer mouse (Peromyscus maniculatus), brush mouse (P boylii), Mexican woodrat (Neotoma mexicana), and Mexican vole (Microtus mexicanus). Spotted owl prey in our study area were smaller on average than prey in other locations, and the total biomass of potential prey was less than that reported in other areas within the owl's geographic range. Although all prey populations...
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We analyzed variation in canopy closure around 47 Mexican spotted owl (Strix occidentalis lucida) nest sires and 47 random forest sites on the Coconino National Forest in northcentral Arizona. We mapped distinct habitat polygons on 1:15,840 color aerial photographs, assigned each polygon to one of 4 canopy-closure classes (70%), and measured the area in each canopy class within 5 concentric analysis zones with radii of 0.1, 0.4, 0.8, 1.2, and 1.6 km (delineating rings of about 4, 47, 150, 252, and 352 ha). Landscape composition differed between spotted owl nest and random sites (P 70% canopy-closure class and less area in the 70% canopy predominated Nesting spotted owls selected areas with denser canopy than randomly...
We studied first-year movements of Mexican Spotted Owls (Strix occidentalis lucida) during natal dispersal in canyonlands of southern Utah. Thirty-one juvenile Mexican Spotted Owls were captured and radiotracked during 1992-95 to examine behavior and conduct experiments related to the onset of natal dispersal. Juvenile Spotted Owls dispersed from their nest areas during September to October each year, with 85% leaving in September. The onset of movements was sudden and juveniles dispersed in varied directions. The median distance from nest area to last observed location was 25.7 km (range = 1.7-92.3 km). Three of 26 juveniles tracked (11%) were alive after one year, although none were observed with mates. We conducted...
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This dataset contains the result of the bioclimatic-envelope modeling of nine bird species -- Northern/Masked Bobwhite Quail (Colinus virginianus), Scaled Quail (Callipepla squamata), Pinyon Jay (Gymnorhinus cyanocephalus), Juniper Titmouse (Baeolophus ridgwayi), Mexican Spotted Owl (Strix occidentalis lucida), Cassin’s Sparrow (Peucaea cassinii), Lesser Prairie-Chicken (Tympanuchus pallidicinctus), Montezuma Quail (Cyrtonyx montezumae), and White-tailed Ptarmigan (Lagopus leucurus) -- in the South Central US using the downscaled data provided by WorldClim. We used five species distribution models (SDM) including Generalized Linear Model, Random Forest, Boosted Regression Tree, Maxent, and Multivariate Adaptive...
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This map shows the potential current distribution of Mexican Spotted Owl, in the context of current and near-term terrestrial intactness and long-term potential for climate change and energy development.
The recovery plan for the Mexican spotted owl (Strix occidentalis lucida) recommended protection of owl nesting and roosting habitat. Descriptions of rnicrohabitat (less than or equal to-0.04 ha) characteristics associated with suitable nesting sites have been limited for the area of pine-oak forest occupied by this species in Arizona, USA. Therefore, we studied Mexican spotted owl habitat on a 585-km(2) study area on the Coconino Plateau near Flagstaff, Arizona. Mexican spotted owls nested primarily in mature (greater than or equal to45.7-cm diameter at breast height dbh) Gambel oak (Quercus gambelii; 40%) and ponderosa pine (Pines ponderosa; 37%) trees. We examined a plausible set of a priori models using both...
We determined temporal and spatial differences in abundance and habitat use by small mammals in southeastern Utah as part of an effort to enhance management of the Mexican Spotted Owl (Strix occidentalis lucida), listed by the federal government as threatened. Woodrats (Neotoma spp.) were captured only in canyons and most frequently in the pinyon-juniper (Pinus edulis-Juniperus osteosperma) vegetation type. White-footed mice (Peromyscus spp.) were found in a variety of vegetation types in both canyons and mesas. The deer mouse (P. maniculatus) was generally the most frequently captured species among vegetation types. We found seasonal and yearly differences in relative abundance of each small mammal species. Our...
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This map contains:Terrestrial Intactness results for the State of Utah and the Colorado Plateau Ecoregion, 1 km resolution.Terrestrial Species Intactness results clipped to 15 different species' distributions, showing the TI status/condition for each species of interest in the COP.These datasets provide an estimate of current terrestrial intactness (i.e. condition) based on the extent to which human impacts such as agriculture, urban development, natural resource extraction, and invasive species have disrupted the landscape across the State of Utah and the Colorado Plateau Ecoregion. Terrestrial intactness values will be high in areas where these impacts are low.Documentation of model structure and input data and...
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Finite population sampling theory is useful in estimating total population size (abundance) from abundance estimates of each sampled unit (quadrat). We develop estimators that allow correlated quadrat abundance estimates, even for quadrats in different sampling strata. Correlated quadrat abundance estimates based on mark-recapture or distance sampling methods occur when data are pooled across quadrats to estimate, for example, capture probability parameters or sighting functions. When only minimal information is available from each quadrat, pooling of data across quadrats may be necessary to efficiently estimate capture probabilities or sighting functions. We further include information from a quadrat-based auxiliary...
The Mexican spotted owl (Strix occidentalis lucida) is a threatened subspecies whose recovery depends, in part, on both an understanding of its habitat requirements and the protection of its habitat. Therefore, we evaluated habitat composition and configuration around owl sites in the Tularosa Mountains, New Mexico, using a vegetation map derived from Landsat Thematic Mapper (TM) digital imagery and digital elevation models. Owls occupied sites with more mature mixed-conifer and mature pine and less pinyon-juniper than random sites. No difference existed in the amount of young forest between owl and random sites. After correcting for the area of the vegetation classes within owl territories, no difference existed...
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This map shows the potential current distribution of mexican spotted owl, in the context of current and near-term terrestrial intactness and long-term potential for climate change and energy development. These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the...
    map background search result map search result map Estimating population size with correlated sampling unit estimates Canopy closure around nest sites of Mexican spotted owls in northcentral Arizona Colorado Plateau REA Conservation Elements - Terrestrial Species: Mexican Spotted Owl Projected future bioclimate-envelope suitability for bird species in South Central USA BLM REA COP 2010 Mexican Spotted Owl Areas identified in Draft Recovery Plan BLM REA COP 2010 Colorado Plateau (COP) Distribution of the Mexican Spotted Owl BLM REA COP 2014 UCS COP Terrestrial Intactness 177928 Mexican Spotted Owl Canopy closure around nest sites of Mexican spotted owls in northcentral Arizona Estimating population size with correlated sampling unit estimates BLM REA COP 2010 Mexican Spotted Owl Areas identified in Draft Recovery Plan Projected future bioclimate-envelope suitability for bird species in South Central USA Colorado Plateau REA Conservation Elements - Terrestrial Species: Mexican Spotted Owl BLM REA COP 2014 UCS COP Terrestrial Intactness 177928 Mexican Spotted Owl BLM REA COP 2010 Colorado Plateau (COP) Distribution of the Mexican Spotted Owl