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In 2002, Rocky Mountain Bird Observatory (RMBO), in cooperation with Bureau of Land Management, U.S. Forest Service, Wyoming Game and Fish Department, and the Wyoming Partners In Flight group, implemented a long-term, habitat-based bird monitoring program designed to provide rigorous population trend data on most diurnal, regularly occurring breeding bird species in Wyoming (Leukering et al. 2001). Modeled after Monitoring Colorado’s Birds (Leukering et al. 2000), this program is entitled Monitoring Wyoming’s Birds (MWB). Monitoring Wyoming’s Birds is consistent with goals emphasized in the Partners In Flight National Landbird Monitoring Strategy (Bart et al. 2001) and, in addition to monitoring bird...
Categories: Publication; Tags: WLCI, WLCI Agency Report
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The northern leopard frog (Rana pipiens) is a formerly abundant frog that has experienced significant declines across its range and is considered endangered in some parts of the range but still abundant in other parts of the range. Various factors have been invoked to explain population declines in the northern leopard frog, including habitat destruction, diseases, chemical contamination, acidification, increased ultraviolet light due to loss of the ozone layer, introduced predators, overcollecting, climatic changes, and general environmental degradation. However, no one cause has emerged as the primary factor behind population declines in any area. Probably, multiple causes contribute to population...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
Flannelmouth sucker (Catostomus latipinnis), bluehead sucker (Catostomus discobolus), and roundtail chub (Gila robusta), hereafter target species, are native to the Colorado River basin and have undergone declines in both abundance and distribution throughout their ranges. Due to these declines, state and federal agencies have entered into a range-wide conservation agreement and strategy to ensure the persistence of these species in their native ranges (Utah Division of Wildlife Resources 2006) 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 throughout the...
Categories: Publication; Tags: WLCI, WLCI Agency Report
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The dwarf shrew (Sorex nanus) is one of the smallest mammals in the world, and inhabits a variety of habitats in western North America. Very little is known about this shrew, and relatively few specimens have been collected. Like most members of Soricidae, the dwarf shrew has a long and pointed nose, small eyes and ears, and a small body. It is difficult to distinguish from other shrews and generally has to be identified by dental characteristics. The dwarf shrew occurs primarily in mountainous areas, apparently preferring rock outcrops and talus slopes in alpine, subalpine, and montane settings. However, it has been occasionally found in lower and more arid environments such as shortgrass prairie, shrub-steppe,...
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Myotis evotis (long-eared myotis), a former Category 2 Candidate, is currently recognized by several federal and state agencies as a sensitive species, in part because very little information exists to provide evaluations on population status and viability locally or rangewide. Primary threats to M. evotis are roost disturbance (especially that leading to loss or destruction of roosting structures), habitat alteration, and toxic chemicals. Roost disturbance (especially of maternity roosts and hibernacula) can take the form of direct human contact or alternation of the roost environment. Habitat alteration refers to modification of any component of the required habitat mosaic, (e.g., presence and quality...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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The Brewer’s Sparrow (Spizella breweri) has significantly declined throughout its breeding range in the last 25 years (Ashley and Stoval 2004). Despite being thought of by many as the most common bird in spring and summer in shrubsteppe habitat, the Brewer’s Sparrow has been given special conservation status in several western states, including Wyoming (Knick and Rotenberry 2000). Habitat fragmentation and other processes threaten Brewer’s Sparrow populations in several ways. In this report, shrubsteppe is defined as habitat with a “…codominance of sagebrush [Artemesia spp.] and native bunch grass and moderate shrub cover” (B. Walker, personal communication). This report reviews key published literature,...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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The Habitat Quality Index (HQI) Procedures Manual is a step-by-step guide to the HQI method, which is used to evaluate trout habitat in Rocky Mountain streams. Purpose of the manual is to provide guidance and standards for conducting HQI evaluations. Subjects discussed included preliminary planning, station selection and layout, equipment, data sources, habitat measurements and HQI calculations. The manual promotes familiarity with the HQI by explaining how and what to measure, as well as proper techniuqes and any useful shortcuts. Text instruction are augmented by photos and line drawings. Several examples and case studies illustrate HQI evaluation procedures.
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The Wyoming Game and Fish Department (WGFD) first developed a stream classification system in 1961. The inaugural system was intended to identify and rank the most important coldwater recreational fisheries to the State. Over time the system was also used to assess the relative potential impacts of proposed development projects to streams. The system also was adapted as one component in a land use management program to assess the relative value of properties being considered for acquisition by WGFD. The stream ranking protocol was periodically modified over the years. In its present form, streams are ranked using a combination of scores for productivity, accessibility and esthetics. In recent years, fisheries...
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The pygmy rabbit (Brachylagus idahoensis) is the smallest of any North American rabbit species. It was first described as Lepus idahoensis in 1891 by Meriam (Meriam 1891). It is endemic to sagebrush habitats in the Great Basin and adjacent intermountain areas and typically occupies tall and dense sagebrush patches. Pygmy rabbits are dietary specialists on big sagebrush. They are considered a keystone species in big sagebrush communities because they don’t thrive in habitats dominated by other shrub species, they exhibit a unique fossorial behavior, other species of vertebrates and invertebrates use their extensive burrow system, and they provide a reliable food supply for terrestrial and avian predators...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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The Mountain Plover (Charadrius montanus) is and endemic shorebird species which breeds in grassland and shrubsteppe habitats of the western Great Plains and Colorado Plateau. Occurrences of this species in Wyoming are constrained to breeding and migration seasons. First described in 1837 by J. K. Townsend, from the tablelands of the Rocky Mountains in the region of the Sweetwater River, Wyoming (AOU 1983), this species is locally common and has been detected in every county of Wyoming. The Mountain Plover was proposed for listing as threatened under the Endangered Species Act by the U. S. Fish and Wildlife Service in 1999. The proposal for listing was withdrawn in 2003, as perceived threats to the species...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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Currently, little is known about the native fish assemblages present in the Green River drainage of southwestern Wyoming. Of particular interest are the bluehead sucker (BHS), flannelmouth sucker (FMS), and the roundtail chub (RTC). Bluehead sucker, FMS, and RTC have declined in Wyoming and throughout their native ranges. The Natural Heritage Program assigns BHS the global ranking of G4 suggesting its existence to be abundant and globally secure, although it may be quite rare in parts of its range and is thus the element of long-term concern (Fertig and Beauvais 1999). The Natural Heritage Program assigns FMS the global ranking of G3/G4 suggesting its existence to be uncertain. It is uncommon but seems...
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The western subspecies of Corynorhinus, C. townsendii pallescens and C. t. townsendii are not currently federally listed or candidate species throughout their range. Two eastern subspecies, C. townsendii ingens and C. townsendii virginianus, are currently listed as Endangered by the U.S. Fish and Wildlife Service. Both Regions 2 and 4 of the Forest Service and the Bureau of Land Management in Wyoming and Colorado list the full species as sensitive within their jurisdictions. The Bureau of Land Management in South Dakota, Nebraska and Kansas apparently does not provide any special protection for the bats. The Wyoming Natural Diversity Database lists it as being of particular conservation concern as indicated...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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Plegadis chihi, the White-faced Ibis, is a member of the Ciconiiformes order. They are large, long-legged birds, and they fly with a strong and steady wingbeat (Trost 1989). They are members of the Threskiornithidae family and as such are wading birds. They are gregarious, heronlike birds with long legs and long specialized bills to facilitate feeding in shallow waters (Field Guide to the Birds of North America 1999). They often fly in flocks of 10-50 birds, either in a “V” formation or in long lines, and their only vocalization is a double grunt that sounds like “greh-greh” (Trost 1989). The White-faced Ibis is an attractive wading bird that is locally common in the western United States, where it...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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Four populations of Columbia spotted frog (Rana luteiventris) are currently recognized, including three disjunct, southern populations and a main population extending from northwest Wyoming through western Canada. The main (or northern) population includes Wyoming. It has no federal status as endangered or threatened and is generally considered to be secure, although some local declines have been documented. Most occupied habitat for the Columbia spotted frog occurs on lands managed by the National Forest Service (Regions 2 and 4) and the National Park Service (Yellowstone and Grand Teton national parks ). The Bureau of Land Management (BLM) may have potential habitat in the Green River Basin and higher...
Categories: Publication; Tags: BLM, UCRB, WLCI, WLCI Agency Report
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The Long-billed Curlew (Numenius americanus) is the largest bird in the sandpiper family (Scolopacidae), and one of only nine species of grassland birds that is considered endemic to the Great Plains (Dugger and Dugger 2002). This curlew species has the southernmost breeding distribution and northernmost wintering distribution of the four curlew species found in North America (Dugger and Dugger 2002). It breeds in the Great Plains, Great Basin, and intermontane valleys of the western U.S. and southwestern Canada (Dugger and Dugger 2002). The Longbilled Curlew is cinnamon-brown above, and buff below, with a very long, strongly downcurved bill (Field Guide to the Birds of North America 1999). Cinnamon-buff wing...
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Interest in rare species has increased substantially over the past 40 years, and currently there is broad support for the conservation of rare plants and animals in North America. Natural resource managers, policy makers, and the public require an understanding of the identity, distribution, and abundance of rare species in order to develop effective conservation strategies. Such information is especially vital to management plans that strive to integrate the conservation of rare species with development of natural resources. This publication provides the most complete information available on the status of rare vertebrate species and vascular plant species in Wyoming. It updates and...
Categories: Publication; Tags: WLCI, WLCI Agency Report
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In 2002, Rocky Mountain Bird Observatory (RMBO), in cooperation with Bureau of Land Management, U.S. Forest Service, Wyoming Game and Fish Department, and the Wyoming Partners In Flight group, implemented a long-term, habitat-based bird monitoring program designed to provide rigorous population trend data on most diurnal, regularly occurring breeding bird species in Wyoming (Leukering et al. 2001). Modeled after Monitoring Colorado’s Birds (Leukering et al. 2000), this program is entitled Monitoring Wyoming’s Birds (MWB). Monitoring Wyoming’s Birds is consistent with goals emphasized in the Partners In Flight National Landbird Monitoring Strategy (Bart et al. 2001) and, in addition to monitoring bird populations,...
Categories: Publication; Tags: WLCI, WLCI Agency Report
There are an estimated 28,000 mule deer in the upper Green River Basin (i.e., Sublette Herd, Wyoming Game and Fish Department [WGFD] 2006), most of which annually migrate 40 to 100 miles to summer in portions of 5 mountain ranges (Sawyer et al. 2005). Accordingly, successful management of this deer herd will require that functional migration routes remain intact. Given the increased levels of both energy (Bureau of Land Management [BLM] 2005) and housing (Taylor and Lieske 2002) development in Sublette County, identifying and conserving migration routes has become increasingly important. Currently, migration routes are depicted by simply connecting the dots between locations of marked animals (e.g., Sawyer et...
Categories: Publication; Tags: WLCI, WLCI Agency Report
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The Northern Goshawk (Accipiter gentilis, Linnaeus 1758) is a diurnal raptor (Family Accipitridae) of temperate forests and woodlands. The genus Accipiter is representative of closely related hawks noted for long tails and relatively broad wings, well suited for pursuit of prey in dense forests. Once commonly known as “bird hawks”, (Craighead and Craighead 1956) the genus is well known for aerial pursuit of avian prey, however, the diet of accipiters is very diverse. Reliant upon explosive acceleration and adept maneuverability, the Northern Goshawk is a predator of birds and small mammals throughout its range. The species has proven to be highly influenced by cyclical abundances of prey species in any...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report
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Pocket gophers are small, vole-like members of the family Geomyidae. They inhabit much of the western half of the United States, a large area of southwestern Canada, and much of Mexico (Bailey 1915). They are powerfully built mammals that are strongly adapted to fossorial living, with small ears, small eyes, fur-lined cheek pouches used to carry food, and very strong front limbs with long nails used for digging. There are several species of pocket gophers in Wyoming and the surrounding states. All look very similar, making it difficult to distinguish specimens to species. Reliable identification has to involve chromosomal analysis (i.e., karyotyping to count chromosome number), with supporting information from geographic...
Categories: Publication; Tags: BLM, WLCI, WLCI Agency Report


map background search result map search result map Species Assessment for Western Long-Eared Myotis (Myotis Evotis) in Wyoming Species Assessment for White-Faced Ibis (Plegadis Chihi) in Wyoming Wyoming Plant and Animal Species of Concern November 2003 Species Assessment for Wyoming Pocket Gopher (Thomomys Clusius) in Wyoming Habitat Quality Index Procedures Manual Species Assessment For The Northern Leopard Frog (Rana Pipiens) In Wyoming Species Assessment for Long-Billed Curlew (Numenius Americanus) in Wyoming Modification of The Wyoming Game and Fish Department’s System For Classifying Stream Fisheries Addendum to Monitoring Wyoming's Birds, 2002-2004 Final Report Species Assessment for Dwarf Shrew (Sorex Nanus) in Wyoming Green River Watershed Native Non-Game Fish Species Research: Phase II Species Assessment For Townsend’s Big-Eared Bat (Corynorhinus [=Plecotus] Townsendii) In Wyoming Species Assessment for Brewer's Sparrow (Spizella Breweri) in Wyoming Species Assessment For Pygmy Rabbit (Brachylagus Idahoensis) In Wyoming Monitoring Wyoming's Birds, 2002-2004 Final Report Species assessment for Columbia spotted frog (Rana luteiventris) in Wyoming Species Assessment For Mountain Plover (Charadrius Montanus) In Wyoming Species Assessment For Northern Goshawk (Accipiter Gentilis) In Wyoming Green River Watershed Native Non-Game Fish Species Research: Phase II Species Assessment for Western Long-Eared Myotis (Myotis Evotis) in Wyoming Species Assessment for White-Faced Ibis (Plegadis Chihi) in Wyoming Wyoming Plant and Animal Species of Concern November 2003 Species Assessment for Wyoming Pocket Gopher (Thomomys Clusius) in Wyoming Habitat Quality Index Procedures Manual Species Assessment For The Northern Leopard Frog (Rana Pipiens) In Wyoming Species Assessment for Long-Billed Curlew (Numenius Americanus) in Wyoming Modification of The Wyoming Game and Fish Department’s System For Classifying Stream Fisheries Addendum to Monitoring Wyoming's Birds, 2002-2004 Final Report Species Assessment for Dwarf Shrew (Sorex Nanus) in Wyoming Species Assessment For Townsend’s Big-Eared Bat (Corynorhinus [=Plecotus] Townsendii) In Wyoming Species Assessment for Brewer's Sparrow (Spizella Breweri) in Wyoming Species Assessment For Pygmy Rabbit (Brachylagus Idahoensis) In Wyoming Monitoring Wyoming's Birds, 2002-2004 Final Report Species assessment for Columbia spotted frog (Rana luteiventris) in Wyoming Species Assessment For Mountain Plover (Charadrius Montanus) In Wyoming Species Assessment For Northern Goshawk (Accipiter Gentilis) In Wyoming