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<br />Table 8. Concentration of chlorophyll a (mg/m2) in periphyton from the Green River, May - Septembers 1979. <br /> <br /> 5/21 6/15 7/19 <br />Upper Middle Lower Upper Middle Lower Upper Middle Lower <br />x SO x SO x SO x SO x SO x SD x SO x SO x SO <br /><3 0 <3 0 18.7 1.7 26.5 9.3 47.8 13.5 7.4 7.6 58.2 15 84.8 47.6 163.9 32.7 <br /> <br />Upper <br /> <br />8/17 <br />Middle <br /> <br />Lower <br /> <br />Upper <br /> <br />9/28 <br />Middle <br /> <br />Lower <br /> <br />x SO x SO x SO <br /> <br />x SO x SO x SO <br /> <br />56.5 67.1 90.4 34.8 260.5 37.8 <br /> <br />1537.8 111.7 1085.4 415.2 351.3 180.6 <br /> <br />W <br />N <br /> <br />.. '.. .., '.... (~ -.' .. .. .....:- - .. - :.. - ;- .. <br />