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;0 C-:'" C,) . ( " -.....1 13 blue ribbon trout fishery in the Navajo Dam tailwater reach and supported by cold water releases from the reservoir) and its upper tributaries. Red shiner (Cyprinella lutrensis), fathead minnow IPimeDhales promelas), and mosquitofish (Gambusia affinis) are the most common non-native species found in low-velocity habitats associated with the mainstem San Juan River. o Terrestrial Resources The variety in topography and diversity of vegetative communities within the San Juan Basin provide habitats for a broad assemblage of terrestrial species. These include Rocky Mountain elk ICervus elaphus) and mule deer (Odocoileus hemionus) as primary big game mammals in certain portions of the basin and such predators and furbearers as coyote (Canis latrans), gray lox (Urocyon cinereoargenteus), kit fox (Vulpes macrotis), mountain lion (Felis concolor), bobcat Ilynx rufusl. striped skunk (Mephitis mephitis), western spotted skunk (Spi/oaale gracilis) badger (Taxidea taxus), and raccoon Iprocyon loter). A wide variety of both migratory and resident bird species are known from the San Juan Basin. These include raptors such as the bald eagle (Haliaeetus lucocephalus), peregrine falcon (Falco peregrinus), golden eagle (Aquila chrysaetos), ferruginous hawk (Buteo regalis), red-tailed hawk @. iamaicensis), and osprey IPandion haliaetus). Species of shorebirds documented in the San Juan River Valley include the great blue heron (Ardea herodias), black-crowned night heron (Nycticorax nycticorax). killdeer (Charadrius vociferus), and black-necked stilt IHimantoDus mexicanus). The San Juan River provides wintering and nesting habitat for migratory waterfowl. Most noticeable of these are the Canada geese (Branta canadensis) utilizing the croplands adjacent to the San Juan River in the vicinity of Farmington. Concentrations of this species in the river valley fluctuate depending upon food availability and weather conditions. For a more detailed listing of the basin's avifauna, the reader is referred to Hubbard (1978). Threatened Or Endangered Species In addition to the razorback sucker, which is the subject of this proposal, species of both plants and animals that have been federally listed under the Endangered Species Act may occur within the general area of this analysis. These include the threatened Mesa Verde cactus ISclerocactus mesae-verdael, and endangered mancos Milkvetch (Astragalus humillimus), peregrine falcon, bald eagle, and Colorado squawfish. The Mesa Verde cactus was listed as threatened on October 30, 1979. Threats to the cactus are principally collection of plants by commercial and private collectors and destruction or modification of its habitat through surface disturbance from energy