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<br />002855 <br /> <br />. <br /> <br />30 <br /> <br />Heavy <br />pollution <br /> <br />Moderate <br />pollution <br /> <br />Clean <br />water <br /> <br />~ 20 <br />v; <br />u.. <br />0 <br />ffi <br />III <br />::E <br />:;) <br />2 10 <br />. <br /> <br />. <br /> <br /> <br />0.5 <br /> <br />1.0 <br /> <br />1.5 2.0 2.5 <br />DIVERSITY INDEX (d) <br /> <br />3.0 <br /> <br />3.5 <br /> <br />4.0 <br /> <br />Figure II. - Frequency distribution of diversity indices of benthic <br />macroinvertchratcs in streams of the Yampa River basin, <br />August. September 1975 (the classifications heavy pollution, <br />moderatc pollution, and clean water are after Wilhm and <br />Dorris, 1968). <br /> <br />. <br /> <br />21 <br /> <br />j <br /> <br />,j' <br />