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. | |