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Table 28A.-The concentration of phytoplankton and zooplankton (>505-µm size-fraction) at Parker Dam for <br />phase 1 (Jan. 1987 to June 1987). <br />Phytoplankton Taxa 1/5 2/9 3/17 4/20 5/18 6/22 <br />Bacillariophyta (diatoms) p c p c c <br />Chlorophyta (green algae) p va c <br />Cyanophyta (blue-green algae) p p va c <br />Pyrrhophyta (dinoflagellates) <br />Rhodophyta (red algae) <br />Macrophyta p 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) <br />Zooplankton Taxa <br />Nauplius <br />Diaptomus spp. <br />Bosmina sp. <br />Daphnia spp. <br />Daphnia eggs <br />Leptodora kindtii <br />Animal Fragments <br />p = present (1-5 individuals/L) <br />c = common (6-15 individuals/L) <br />a = abundant (16-25 individuals/L) <br />va = very abundant (>25 individuals/L) <br />1/5 2/9 3/17 4/20 5/18 6/22 <br /> p p c p <br />va va va va va va <br />va va va va a va <br /> a p a p <br />62