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average internal resemblance (i.e. between - sample similarity) of applicable reference areas for species <br />density data is often in the range of 70 %, the standard is 63% (0.9 x 70 %). (The assessment of internal <br />similarity was performed on data from the extended reference areas) <br />The Motyka similarity index is used as follows: <br />2c <br />Where: <br />c = the smaller of the paired species density values (for each <br />lifeform) of the reclaimed and reference areas* <br />a = total of species density values for lifeforms of the reclaimed <br />areas <br />b = total of species density values for the lifeforms of the reference <br />area* <br />* Weighted average lifeform species density using the Seneca 11W Reference Areas (weighted based on <br />11% original extent of Aspen, 35% original extent of Mountain Brush, 31% original extent of Sagebrush, <br />13% original extent of Steep Mountain Brush and 10% original extent of Western Wheatgrass/ Alkali <br />Sagebrush). <br />Only species density by vascular plants are included. Lifeforms used include: <br />Annual /biennial forbs <br />Annual grasses <br />Perennial forbs <br />Perennial cool season grasses <br />If the index of similarity between the species density within the specified lifeforms of the reclaimed and <br />reference areas exceeds 63 %, then Test C is passed. <br />Alternative Test D): Native Species Presence Assessment <br />The third alternative assessment of the species diversity of reclaimed lands makes direct reference to the <br />presence of native western North American plant species in reclaimed areas. <br />10 <br />