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138 <br />.25 <br />W <br />~... <br />a E .20 <br />z ~, <br />U~ .'15 <br />~" <br />w= <br />0 <br />wti ' 10 <br />.05 <br />3C <br />2F <br />n <br />N .20 <br />WE <br />>~ <br />a~ .15 <br />2~ <br />Z= <br />Zti • 10 <br />.05 <br />GREAT BASIN NATURALIST <br />~\ <br />~ ~ <br />~ ~ <br />Vol. 45, No. 1 <br />~ ~~ <br />/ ~ <br />~ 4 <br />/ 1 <br />/ ~ <br />t <br />~~ ~~~SD <br />~ ~~ <br />~ ~ _-1~ • R.T <br />/ ~~ ~BH <br />~ / <br />~ ~\ IQFM <br />.01 .1 1.0 10 <br />SUBSTRATE (cm) <br />Fig. 7. Distribution of fish by species over substrate types in the Yampa River. Fish were collected between river <br />miles 16.5 and 18.0 24-26 July 1981. See Table 3 for species codes. <br />have been shown to have profound effects on jor trophic levels (primary producers, detritus <br />the river biocenosis. In this study, certain levels, macroinvertebrates, and fish) indicates <br />physical factors were also shown to be impor- that distribution may be related to substrate <br />tant in determining the distribution of the size (Fig. 7). The same general pattern ap- <br />aquatic community. A comparison of the ma- peared for all of the major groups of organ- <br />~'~ <br />~4 <br />ij <br />M <br /> <br />01 ,1 1.0 10 <br />SUBSTRATE (cm) <br />