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A TABLE 1 <br />SUMMARY OF DATA FROM TWO RESERVOIR AREAS IN 1964. DATA SHOWS ONLY PRESENCE OR ABSENCE OF ORGANISMS IN THE SAMPLE. <br /> <br />Month Chironomidae Ephemeroptera <br />- Trichoptera Mollusca <br /> Area Present Absent resent <br />Absent Present Absent Present Absent <br />May Canyon x X X X <br />June* Open x X X X <br /> Canyon x X X <br />X <br />July Open x X X X <br /> Canyon x X X X <br />September Open x X X X <br /> Canyon x X X X <br />October Open x X X X <br />*Samples were collected from the Canyon area in May and from the Open area in June. <br />W <br />Qq