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Draft" (Stearns-Roger, 1973); and from pre mine vegetation sampling surveys con- <br />ducted by Trapper Mine environmental personnel in 1978, 1979 and 1980. Trapper <br />deleted all phreatophytes from [he list of plants identified by ECI since the ECI <br />studies included the Yampa River and points of its juncture with upland drain- <br />ages. With minor exceptions, disturbance from mining activities will not dis- <br />place phreatophytic species within the areas of disturbance. Species identifica- <br />tions for ECI were verified by Drs. W.M. Klein and R.G. Walters, curra[ors of the <br />Colorado Slate University Herbarium. All specimens collected by Trapper Mine <br />personnel were placed in our herbarium with verification of species by Mrs. Karen <br />Eberle, plant taxonomist for the Craig District Office, Bureau of Land Management <br />(Appendix D). <br />A final screening of the ECI list was made against the Plant Information Network <br />(PIN) list of plants known to occur in Moffat County between 6000 and 8000 feet. <br />Trapper Mine elevation is between 6300 feet to 7700 feet. The PIN inventory for <br />this area is assumed to be the most accurate and up-to-date list available. <br />Therefore, any species occurring in [he ECI list and not in PIN were assumed to <br />be in error and were deleted. Specimens observed by ECI are not recoverable for <br />verification. None of the deleted species from the ECI work are on the threat- <br />ened or endangered species list (Section 2.3.5). <br />2.3.1.2 Dominant Plant Species <br />A determination of dominant plant species and lifeform for each range site was <br />determined from relative aerial cover (1979 and 1980 data). Table 2.3-2 indi- <br />cates that in [he mountain shrub range site (A), shrubs are by far the dominant <br />lifeform providing 74.1% relative aerial cover. The dominant shrubby plant spe- <br />cies based on shrub density (1980), (Table 2.3-15) are Symphoricarpos oreophi- <br />lus, Quercus gambelli, and Amelanchier alnifolia. It is interesting to note that <br />based on cover (1979 data, Table 2.3-Z), the ranking is slightly different. Q. <br />gambellii is [he dominant shrub followed by A. alnifolia and [hen S. oreophilus. <br />This is due [o the fact [hat S. oreophilus is an understory shrub and a heavy <br />sprouter while the other two species are overstory shrubs. Q. gambellii and A. <br />2-65 <br />