Treesearch

This user's guide and reference document describes the physical features of the Salmon River Basin, Idaho, stream channels that represent "natural conditions" for fish habitat-that is, streams that have not been influenced by major human disturbances. The data base was created to assist biologists and resource managers. It describes resource conditions that can be achieved through management objectives.

The Colorado River cutthroat trout historically occupied portions of the Colorado River drainage in Wyoming, Colorado, Utah, Arizona, and New Mexico (Behnke 1992). Though it is now restricted to headwater streams and lakes, its original distribution probably included portions of larger streams, such as the Green (Simon 1935), Yampa, White, Colorado, and San Juan rivers.

The Rio Grande cutthroat trout was once widespread in the upper Rio Grande and Canadian River basins of northern New Mexico and south-central Colorado and in the headwaters of the Pecos River, New Mexico (Sublette et al. 1990; Behnke 1992). It may have occurred as far south as Chihuahua, Mexico (Behnke 1992). Currently, it is restricted primarily to headwater tributaries within its native range. Its southernmost distribution is Indian Creek in the Lincoln National Forest and Animas Creek in the Gila National Forest, southern New Mexico. It ranges north to headwater tributaries of the Rio...

This document focuses on the state of the science for five subspecies of cutthroat trout found largely on public lands in the Rocky Mountain and Intermountain West. These subspecies are restricted to a fragment of their former range, and primarily occupy small, high-elevation streams. Little is known about the three rarest subspecies (Bonneville, Colorado River, and Rio Grande cutthroat trout), and the data on the more abundant subspecies (westslope and Yellowstone cutthroat trout) were obtained from relatively few areas. The historic diversity of life history strategies has been reduced....

The five subspecies of cutthroat trout considered in this assessment share one characteristic: the loss of populations throughout their historical ranges. Similar causes have led to these losses: the introduction of nonnative fishes, overharvest, habitat degradation, and probably habitat fragmentation. Synergism among these effects remains unstudied, and we do not understand the biology of some of these subspecies, hence our ability to reverse the loss of populations is handicapped. Ironically, such ignorance has been inappropriately interpreted as a reason to avoid management action until...

The westslope cutthroat trout inhabits streams on both sides of the Continental Divide. On the east side of the divide, they are distributed mostly in Montana but also occur in some headwaters in Wyoming and southern Alberta (Behnke 1992). They are in the Missouri Basin downstream to about 60 km below Great Falls and in the headwaters of the Judith, Milk, and Marias rivers. On the west side of the Continental Divide the subspecies occurs in the upper Kootenai River; the Clark Fork drainage in Montana and Idaho downstream to the falls on the Fend Oreille River; the Spokane River above...

In this little stream, the trout are more abundant than we have yet seen them. One of our sober men took, this afternoon, upward of thirty pounds. These fish would probably average fifteen or sixteen inches in length, and weigh three-quarters of a pound; occasionally, however, a much larger one is seen." This passage from the journal of John Townsend, a trader delivering goods to mountain fur trappers (Townsend, in Trotter and Bisson 1988), describes the Bear River in Wyoming and refers to the native Bonneville cutthroat trout.

The Yellowstone cutthroat trout is more abundant and inhabits a greater geographical range than does any other nonanadronnous subspecies of cutthroat trout (Varley and Gresswell 1988). The Yellowstone cutthroat trout was indigenous to the Snake River upstream from Shoshone Falls, Idaho, and the Yellowstone River above the Tongue River, Montana (Behnke 1992). Although there are some disagreements concerning the evolutionary history of cutthroat trout and various cutthroat trout subspecies (Behnke 1992; Stearley 1992; Stearley and Smith 1993), the most recent incursion of Yellowstone...

Reports of larch dwarf mistletoe parasitizing alpine larch are based on two collections of this host/parasite combination made by J.R. Weir in Montana during the early 1900s. Examination of host material from these collections indicates that the host is western larch, not alpine larch as previously reported. Attempts to locate larch dwarf mistletoe on alpine larch were unsuccessful, leaving no valid reports of larch dwarf mistletoe on alpine larch.

Since the early 1960's Missoula Technology and Development Center (MTDC) and Forest Pest Management (FPM) have worked in partnership developing technology to support forest health and silviculture. Traditionally this partnership has included cooperators from other agencies, States, foreign governments, academia, industry, and individual landowners. The FPM sponsored projects have focused on engineering development of delivery systems and methods to mitigate environmental impact, protect personnel, and reduce costs while meeting resource manager forest health objectives. This paper summarize...