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<br /> <br />o <br />o <br /><::') <br /> <br />12 <br /> <br />....-, <br /> <br />W community. The following taxa are indicative of this community: shadscale (Atriolex <br />~ confertifolia) and broadscale (A. obovata); big sagebrush (Artemisia tridentata), Bigelow <br />sagebrush (A.biaeloviil, sand sagebrush (A. filifolia), black sagebrush (A. arbuscula ssp. nova), <br />Parry sagebrush (A. llilJIYi), and bud sagebrush (A. soinescens); fivehook bassia (Bassia <br />hvssooifolia); three-leaf snakeweed (Gutierrezia microceohala) and broom snakeweed (G. <br />sarothrae); winterfat (Eurotia lanata); tanglebrush (Forestiera neomexicana); tumbleweed <br />(Sa Isola iberica and ~. kali); greasewood (Sarcobatus vermiculatus); rabbitbrush <br />(Chrvsothamnus nauseosus); galleta grass (Hilaria iamesii); whipple cholla (Oountia whioolei); <br />pediocactus (Pediocactus spp. sclerocactus (Sclerocactus spp.); and gray horsebrush <br />(Tetradvmia canescens). <br /> <br />The Great Basin desert grasslands and Plains grasslands communities intergrade and form <br />transitional areas in northwestern and central New Mexico, southern Utah, northern Arizona, <br />and southcentral and western Colorado (Brown 1982). Because these two communities <br />overlap, they will be referred to herein as the grasslands community. Much of this general <br />community has been converted to irrigated cropland. Extensive over-grazing and fire <br />suppression have led to shrub invasion of grassland habitats. The following species are <br />characteristic of the grassland community found in the analysis area for this assessment: <br />western wheatgrass (Aaroovron smithii); little bluestem (Androooaon scooarius); prickly poppy <br />(Araemone spp.); asters (Aster spp.); sideoats grama (Bouteloua curtioendula), black grama <br />(f!. erioooda), blue grama (fl.. aracilisl. and hairy grama (f!. hirsuta); buffalo grass (Buchloe <br />dactvloides); thistles (Cirsium spp.); plains lovegrass (Eraarostis intermedia); Arizona fescue <br />(Fescue arizonica); galleta (H. iamesii); one-seed juniper (Junioerus monosoerma); Wright <br />fishook cactus (Mammilaria wriahtii); four o'clock (Mirabilis spp.); evening primrose <br />(Oenothera spp.); club cholla (0. clavata) and tree cholla (Q. imbricata); vine mesquite grass <br />(Panicum obtusuml mallows (Sohaeralcea spp.); sand dropseed (Soorobolus crvotandrus); <br />needle and thread grass (Stioa comata); goldeneye (Viauiera spp.); and soapweed (Yucca <br />alauca). <br /> <br />The conifer woodland community occupies mesic upland sites (5000 to 7000 feet) in the San <br />Juan Basin. The grassland community often occurs together with the conifer woodland <br />community. The following species are indicative of the conifer woodland community type: <br />serviceberry (Amelanchier spp.); Fremont mahonia (Berberis fremontii) and red mahonia (f!. <br />haematocaroa); sego-liIy (Calochortus nuttallii); alderleaf mountain-mahogany (Cercocarous <br />montanus); c1iffrose (Cowania spp.); mountain joint-fir (Eohedra viridis); apache plume <br />(Falluaia oaradoxa); gilia (Gilia spp.); lupines (Luoinus spp.); muhlies (Muhlenberaia spp.); <br />mohave prickly pear (0. erinacea); beardtongue (Penstemon spp.); pinyon pine (Pinus edulisl. <br />Mexican pine (f. cembroides); antelope brittiebrush (Purshia tridentata); Emory oak (Quercus <br />emorvii), Gambel oak (Q. aambelii); gray oak (Q. arisea), and shrub live oak (Q. turbinella); <br />buckthorn (Rhamnus spp.); buffalo berry (Shepherdia spp.); scarlet globemallow (Sphaeralcea <br />coccinea); snowberry (Svmphoriocarous spp.); and banana yucca (Yucca baccata). <br /> <br />D. WILDLIFE <br /> <br />Aauatic Resources <br /> <br />Historically, the San Juan River and its tributaries supported a native fish community of at <br /> <br />J <br />