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Table 25A.-The concentration of phytoplankton (>25-µm size-fraction) at Yuma for phases 1 and 2 (Oct. 1986 to Aug. 1988). <br />Phase 1 Phase 2 <br />TAXA 10120 12/3 1/5 2/9 3/16 9/20 5/20 6/22 10120 1126 3/16 5/3 6/30 8/29 <br />Bacillariophyta (diatoms) va a c a c a c a c c c a a c <br />Cn Chlorophyta (green algae) c - p - - c c c c c c - c - <br />Q0 Chrysophyta (yellow-brown algae) - - - - - - - - - a c - - - <br />Cyanophyta (blue-green algae) p - - - - - - - c - - <br />Euglenophyta (euglenoids) - - - - - - - - - - - <br />Pyrrhophyta (dinoflagellates) - - - - - - - - c - - - <br />Rhodophyta (red algae) - - - - - - - - - - - - - <br />Plant material c c - - - c - - - - - c - - <br />p = present (1-100 No./L) <br />c = common (101-1000 No./L) <br />a = abundant (1001-6000 No./L) <br />va = very abundant (>6001 No./L)