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<br />Aquatic Macroinvertebrates <br /> <br />The composition and abundance of macroinver- <br />tebrates (tables 4 and 5) and the mean diversity <br />indices (ill shown in figure 20 indicate that pop- <br />ulations of organisms respond to changes in <br />water quality. The type, abundance, diversity, <br />and equitability of these organisms for each <br />sampling date can be seen in tables A-21 <br />through A-33 of the appendix. <br /> <br />Heavy metals pollution from the Leadville Drain- <br />age Tunnel, California Gulch, and possibly other <br />downstream sources resulted in a lower (J at <br /> <br />sampling stations affected by these inflows. <br />Total abundance was also significantly reduced <br />below the Leadville Drain and California Gulch. <br />Freshening inflows resulted in a higher (J of <br />macroinvertebrates in the river. <br /> <br />Fish <br /> <br />Results of trout population estimates obtained <br />by electrofishing at selected stations are shown <br />in table 6. Figure 21 shows the mean heavy <br />metal content of brown trout ISalmo trutea) <br />livers taken from a subsample of fish collected at <br />each station (n = 6). <br /> <br />Table 2. - Range, mean, and standard deviation of chemical concentrations at all stations <br /> Hardness <br />Sampling Number of Statistic lasCeCOJl TOS C. Mg N. <br />station samDles mg/l <br />EF - 1 19 Range 38-114 46-150 ".2- 28.0 2.4-11.2 0.7-4.8 <br /> " 86 107 21.3 9.8 1.8 <br /> ," 22 28 5.0 11.0 1.0 <br />Leadville 19 A,!nge 316-635 608-876 97.2-149 33.4-68.3 4.4-7.4 <br />Drain , 504 707 123 50.5 5.3 <br /> 84 89 21.5 8.9 0.8 <br />EF - 2 19 R~nge 46-258 62-344 12.8-59.2 3.4-26.8 O.7~3.9 <br /> , 142 191 41.5 13.4 2.2 <br /> , 59 67 23.5 6.2 1.0 <br />AR -, 15 R~nge 36-228 38-294 10.0-52.2 2.7-22.0 0.7-3.7 <br /> , 107 148 26.5 10.0 2.2 <br /> , 57 70 13.6 56 0.9 <br />AR - 2 19 R.!nge 38-168 46-224 12.0-42.6 2.0-27.3 0.7-3.2 <br /> , 106 141 25.4 10.2 2.1 <br /> , 43 56 10.0 5.7 0.8 <br />California 19 R~nge 369-1245 566-2070 83.6-154 38.8-215 6.4-20.7 <br />Gulch , 611 976 117 77.2 16.0 <br /> 192 324 18.9 39.7 3.9 <br />AA ~ 3 19 R,!lnge 41-215 62-310 12.0-51.0 2.4-22.0 0.7-9.4 <br /> , 128 194 31.8 11.8 3.6 <br /> , 59 71 14.4 5.9 2.1 <br />AA - 4 15 A.!lnge 28-84 44-136 6.4-22.8 2.4-6.8 0.9-62 <br /> , 49 101 12.5 4.3 2.6 <br /> , 17 49 4.7 1.4 1.6 <br />AA - 5 19 A,!nge 32-88 40-142 8.0-22.8 2.4-7.4 1.2-6.4 <br /> , 51 78 12.7 4.2 2.6 <br /> 15 32 4.6 1.6 1.5 <br />AR - 6 15 A!nge 32-84 38-166 8.0-22.8 27-8.8 1.2-5.5 <br /> , 55 84 14.0 4.8 2.9 <br /> , 19 38 4.7 2.0 1.5 <br />AA - 7 19 A.!'nlile 36-80 38-224 9.6-20.6 1.2-7.8 1.2-6.0 <br /> , 52 85 13.5 4.2 2.3 <br /> 16 44 3.8 1.9 1.9 <br />AR ~ 8 15 R.!nga 36-91 34-144 9.6-22.8 2.9-11. 1 1.2-6.0 <br /> , 58 83 14.6 4.9 3.1 <br /> , 20 34 4.6 2.4 1.4 <br />AR - 9 19 R.!lnge 36-76 32-120 9.6-19.2 2.0-6.8 1.2-4.6 <br /> , 47 75 12.9 3.6 2.6 <br /> , 12 24 2.9 1.3 1.0 <br />.x = Mean <br />. .5 = Standard deVIation <br />tTKN = Total Kjeldahl nitrogen <br /> 22 <br />