Existing and Potential Threats Sample Clauses

Existing and Potential Threats. Due to its restricted range and specific habitat requirements, Lomatium greenmanii is extremely vulnerable to human disturbance. The existing and potential threats to the known populations of L. greenmanii include:

Existing and Potential Threats. Twenty years ago, the primary threat to Wyoming populations of Stemless beardtongue was habitat destruction associated with gravel quarrying on private lands (Xxxxx and Xxxx 1979; Xxxx and Xxxx 1980). Active quarries are not currently present or planned in habitat on public lands. Xxxxxxxx (1992) identified grazing as a threat on Forest Service lands in the Xxxxxx Basin in Utah. Although this species is not actively grazed, trampling by livestock could be a source of mortality. The construction of Flaming Gorge Reservoir probably eliminated two populations in Utah (Franklin 1992) and may have inundated potential habitat in southern Wyoming. Competition with invasive weeds, such as white-top (Cardaria sp.) may become a threat at one roadside population on BLM lands in Wyoming. Impacts from off-road vehicle recreation, expansion of existing roads, and habitat degradation from pollution (dumping of agricultural wastes) may be impacting several colonies on private and public lands in Wyoming (Delmatier 2000). Habitat loss and degradation from high recreation use is a threat to several small colonies along the Lucerne Valley Peninsula of Flaming Gorge Reservoir (Franklin 1992). Over-harvest of this species for commercial use as a rock garden ornamental is also a potential threat.

Existing and Potential Threats. May be threatened by surface disturbances associated with road construction, mineral location, or grazing. At Cedar Ridge, these threats appear to be relatively low due to the rugged nature of the site.

Existing and Potential Threats. Marriott (1989) identified six current or potential threats to the persistence of Precocious milkvetch at what was then the only known occurrence in the world: road construction, off-road vehicle recreation, oil and gas development, disturbance associated with a garbage dump, habitat modifications stemming from range improvement projects, and grazing. These threats were considered especially significant due to the plant’s limited geographic range (Xxxxxx et al. 1998). Each of these factors remains a threat, although the direct impacts from grazing are probably less significant than once thought due to the plant’s low stature and palatability (secondary grazing impacts from trailing, soil compaction, erosion, and spread of noxious weeds may still be important, however). Habitat has been lost at several locations due to road construction in the past, and the entire range of the species is vulnerable to impacts from off-road recreation (there are no topographic barriers to limit use within the plant’s occupied habitat). Surveys in 1993 and 1994 by BLM personnel documented significant disturbances in the XxXxxxxx Dump area from vehicles and livestock trailing and a 12% decline in the numbers of A. proimanthus (USDI Bureau of Land Management 1997, p. 199). Road construction and other disturbances associated with seismic exploration were taking place at the newly discovered population near the mouth of Cottonwood Creek (Occurrence # 007) in 2000. Expansion of the XxXxxxxx dump could eliminate or degrade A. proimanthus habitat on the west side of Sweetwater County Highway 1. Managers need to consider possible impacts to this species from future range improvement or fuel reduction projects in this area.