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Table 4 Cell densities of three major phytoplankton taxa and dominant species before and after advanced sewage treatment

From: The effect of phosphorus removal from sewage on the plankton community in a hypertrophic reservoir

Year Month Cell density (cells mL−1) Dominant species
(by biomass, μgC L−1)
Bacillariophyceae Cyanophyceae Chlorophyceae Others Total
2003 Sep. 6408 497,304 534 971 505,217 Oscillatoria sp.
Nov. 4269 213,537 5817 123 223,746 Microcystis sp.
Dec. 115 59,486 3326 1840 64,767 Oscillatoria sp.
2004 Mar. 381 757 545 25 1708 Closterium sp.
Apr. 185 130,010 122,333 3933 256,461 Anabaena sp.
May 43 1,474,200 54,871 1207 1,530,321 Lyngbya sp.
Jun. 58 2,515,477 1234 13,247 2,530,016 Microcystis sp.
Jul. 3385 508,721 1362 34 513,502 Lyngbya sp.
Aug. 299 1,378,199 59 595 1,379,152 Microcystis sp.
Advanced treatment start
2007 Nov. 36 7088 89 1148 8361 Cryptomonas ovata
Dec.. 2196 673 414 61 3344 Stephanodiscus hantzschii
2008 Apr.    1055 1570 2625 Cryptomonas ovata
May 2 796 39,744 389 40,931 Pediastrum duplex
Jun. 2 897,039 276 22 897,339 Microcystis aeruginosa
Jul. 230 33,155 469 533 34,386 Microcystis aeruginosa
Aug. 20 160,053 111 2215 162,399 Microcystis wesenbergii
Sep. 210 30,197 2806 393 33,606 Oscillatoria sancta
Dec. 5581 13 1148 47 6789 Stephanodiscus hantzschii
2009 Mar. 24   190 315 528 Cryptomonas sp.
May 8   3524 1168 4701 Cryptomonas sp.
Sep. 12 2349 24 133 2518 Cryptomonas sp.