GEOGRAPHIC MANAGEMENT UNITS. Three Geographic Management Units (GMUs) have been identified for describing threats and actions for least chub: West Desert GMU, Wasatch Front GMU, and the Xxxxxx River GMU (Figs. 4,5, and 6). These units have been further divided into subunits consistent with the United States Geologic Survey hydrological description of Utah (USGS 1974) to assist in describing threats and prioritizing conservation measures to be implemented. These subunits have been assigned a name by the Division with a corresponding USGS accounting code as shown in Table 1.
GEOGRAPHIC MANAGEMENT UNITS. The historic and current distribution of spotted frog has been separated into three geographic management units (GMU’s) that are based on hydrologic subregions (USGS 1974). These units are the Xxxxxx River GMU, Wasatch Front GMU, and the West Desert GMU (Figure 1). These GMUs have been further divided into subunits consistent with the United States Geological Survey hydrological description of Utah (USGS 1974) to assist in further defining distribution, describing threats, and prioritizing conservation measures to be implemented. These subunits have been assigned a name by the Division with corresponding USGS accounting codes as shown in Table 1. WASATCH FRONT GEOGRAPHIC MANAGEMENT UNIT Subunits where historic records of spotted frog had occurred include Utah Lake, Spanish Fork, Provo River, Jordan River, Upper Xxxxx River, and in the Lower Xxxxx River. Currently a total of seven populations are known to occur in this GMU (Figure 3 and Table 2). They occur in the Utah Lake, Spanish Fork, Provo River, and Upper Xxxxx River subunits. The collection sites, breeding sites, and monitoring sites that have typically been described in the literature and are part of the seven identified populations for this GMU are summarized in Table 2. Figure 3. Management subunits within the Wasatch Front GMU. Threats:
GEOGRAPHIC MANAGEMENT UNITS. The historic and current distribution of spotted frog has been separated into three geographic management units (GMU’s) that are based on hydrologic subregions (USGS 1974). These units are the Xxxxxx River GMU, Wasatch Front GMU, and the West Desert GMU (Figures 3, 4, 5). These GMUs have been further divided into subunits consistent with the United States Geological Survey hydrological description of Utah (USGS 1974) to assist in further defining distribution, describing threats, and prioritizing conservation measures to be implemented. These subunits have been assigned a name by the Division with corresponding USGS accounting codes as shown in Table 1. WASATCH FRONT GEOGRAPHIC MANAGEMENT UNIT Subunits where historic records of spotted frog had occurred include Utah Lake, Spanish Fork, Provo River, Jordan River, Upper Xxxxx River, and in the Lower Xxxxx River. Currently a total of seven wild populations and one introduced population are known to occur in this GMU (Figure 3 and Table 2) They occur in the Utah Lake, Spanish Fork, Provo River, and Upper Xxxxx River subunits. The collection sites, breeding sites, and monitoring sites that have typically been described in the literature for this GMU are summarized in Table 2. Figure 3. Management subunits within the Wasatch Front GMU. Threats: Habitat Degradation Table 2. Summary of subunits containing spotted frog Subunit Population Spanish Fork River Springville Hatchery T-bone Bottoms Xxxxxxxx Springs Diamond Fork Utah Lake Xxxxxxxxx Wetland Complexes and Xxxx Springs Provo River Heber Valley: area between Jordanelle Reservoir and Deer Creek Reservoir Woodland: Provo River corridor above Jordanelle Reservoir Upper Xxxxx Xxxxxx Nature Preserve: introduced population in 2004 The major threat in this GMU is loss of habitat due to urbanization and water development. Agricultural areas and mountain foothills have been converted into neighborhoods and wetland areas in the valleys have been drained and diked. Detrimental Interactions Several nonnative fish species have been introduced into these areas for purposes of mosquito abatement and recreational fishing opportunities. Competition and predation by nonnative species have populations within the Wasatch Front GMU. significantly impacted spotted frog populations and will continue to present a threat. Those non- natives that pose the largest threat to the Columbia spotted frog are: western mosquitofish, brown trout, largemouth bass, common carp, fathead minnow, an...
