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The loggerhead shrike (Lanius ludovicianus ) is widespread in North America, where it generally occurs in open habitats with abundant insect prey and perches for hunting. Examples of suitable habitat are grasslands, sagebrush, and a variety of shrub-steppe habitats. However, it has demonstrated a substantial contraction in distribution and declines in abundance throughout North America. The reasons for these declines are not fully known, although reduction in quality and quantity of native grassland and shrub-steppe communities is a major contributing factor, particularly on wintering grounds in the southern United States and Mexico. Other threats include livestock grazing (decreased prey availability...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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This Species Conservation Assessment was prepared as part of a Species Conservation Project funded by the Wyoming Bureau of Land Management. It represents a complete review of the current published information available for the species, includes consultation with experts, and addresses as much as is known concerning the distribution, biology, ecological niche, and conservation planning being conducted for this species on a state and range-wide level. The reader will note a number of areas in which biological and ecological data are not well known for this species, and that distribution data are based on relatively few specimen and observation records. Systematic surveys of suitable habitat for Euderma...
Categories: Publication; Tags: WLCI, WLCI Agency Report
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The Sage Sparrow (Amphispiza belli) is a common breeding bird in landscapes dominated by big sagebrush (Artemisia spp.) in western North America. The species prefers large, undisturbed tracts of tall and dense sagebrush. Such habitat is declining across large areas, and many sagebrush obligates such as the Sage Sparrow are showing corresponding declines in distribution and abundance. For example, in Washington over half the native shrubsteppe has been converted to agriculture in the last 150 years (Vander Haegen et al. 2000). In this report, shrubsteppe is defined as an environment with a “…co-dominance of sagebrush and native bunch grass and moderate shrub cover” (B. Walker, personal communication)....
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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The sage thrasher (Oreoscoptes montanus), a sagebrush-steppe obligate that relies on large expanses of sagebrush-steppe for successful breeding, is recognized by Canada and several U.S. state agencies as a sensitive species that is apparently at risk based on loss or alteration of breeding habitat and decreasing population trends. In this context, habitat alteration refers to modification of any component of the required habitat mosaic, (e.g., presence and quality of tall big sagebrush (Artemesia spp.), adequate cover, and increased vertical and horizontal heterogeneity) that might directly decrease suitability for nesting habitat. Primary threats to O. montanus habitat are agricultural field cultivation,...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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The data contained in this report was compiled, modified, and analyzed for the Wyoming Landscape Conservation Initiative (WLCI) Integrated Assessment (IA). The WLCI is a long-term science based effort to assess and enhance aquatic and terrestrial habitats at a landscape scale in southwest Wyoming while facilitating responsible energy development through local collaboration and partnerships. The IA is an integrated synthesis and analysis of WLCI resource values based on best available data and information collected from multiple agencies and organizations. It is a support tool for landscape-scale conservation planning and evaluation, and a data and analysis resource that can be used for addressing specific management...
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Conservation efforts to protect and restore native fish species of the Colorado River basin are underway (Utah Division of Wildlife Resource 2004a and 2004b). Flannelmouth sucker (Catostomus latipinnus), bluehead sucker (Catostomus discobolus), and roundtail chub (Gila robusta), hereafter target species, are three species native to the Colorado River basin that have been targeted by these efforts. Weitzel (2002) reports that these three species were historically abundant in the Green River watershed of southwestern Wyoming. However, populations have declined in Wyoming (Weitzel 2002) and in other areas throughout the Colorado River drainage (Bezzerides and Bestgen 2002). The Wyoming Natural Diversity...
All over the west, management agencies and researchers are concerned with mule deer (Odocoileus hemionus) populations that have been in a general decline over the past few decades. Though reasons why are compounding and very complex, a common theme that has become obvious is habitat quality and the amount available. This report provides a summary of various habitat monitoring and improvement projects, loss of habitat, and status of the Wyoming Range deer herd over the last half century. The Wyoming Range mule deer herd occupies an estimated 4,437 mi from the Hoback River south to the Redeye Basin, and encompasses much of the land west of the Green River to the Idaho border, which contains the Wyoming...
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The Western Burrowing Owl (Athene cunicularia hypugaea), hereafter Burrowing Owl, is a diurnal bird of prey specialized for grassland and shrub-steppe habitats in western North America. The Latin species name for the Burrowing Owl, “cunicularia”, means “little miner”, referring to their unique behavior among North American raptors of nesting underground (Green 1988). Burrowing Owls will establish nests in earthen burrows, rock piles, eroded stream banks, and man-made structures such as roadside culverts and eroded irrigation ditches. Zuni Indians referred to the Burrowing Owl as the “priest of the prairie dogs”, presiding on top of burrows within prairie dog colonies (Cynomys spp.) in the Great Plains...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report


map background search result map search result map Resource Index - Terrestrial - Special Management Areas Future Change - Minerals - Total Zeolite Potential Species Assessment for Sage Thrasher (Oreoscoptes Montanus) in Wyoming AWVED (Assessment of Wildlife Vulnerability to Energy Development) Condition Terrestrial - Focal Ecosystems - Total Species Assessment For Western Burrowing Owl (Athene Cunicularia Hypugaea) In Wyoming 2005 Green River Watershed Native Non-Game Fish Species Research: Phase II Species Assessment for Sage Sparrow (Amphispiza Belli) in Wyoming Species Assessment For Loggerhead Shrike (Lanius Ludovicianus) In Wyoming Species Assessment For Spotted Bat(Euderma Maculatum) In Wyoming Condition-Terrestrial-Rare Plants 2005 Green River Watershed Native Non-Game Fish Species Research: Phase II Future Change - Minerals - Total Zeolite Potential Resource Index - Terrestrial - Special Management Areas AWVED (Assessment of Wildlife Vulnerability to Energy Development) Condition Terrestrial - Focal Ecosystems - Total Condition-Terrestrial-Rare Plants Species Assessment for Sage Thrasher (Oreoscoptes Montanus) in Wyoming Species Assessment For Western Burrowing Owl (Athene Cunicularia Hypugaea) In Wyoming Species Assessment for Sage Sparrow (Amphispiza Belli) in Wyoming Species Assessment For Loggerhead Shrike (Lanius Ludovicianus) In Wyoming Species Assessment For Spotted Bat(Euderma Maculatum) In Wyoming