| Report Year: 2009 |
| Hannen Lake, Benton County |
| Phytoplankton |
| | 6/22/2009 | 7/27/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Division | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) |
| Bacillariophyta | 0.170 | 0.486 | 0.328 | 0.706 | 0.157 | 3.348 | 1.438 | 2.205 | 15.981 | 0.101 | 0.005 |
| Chlorophyta | 4.443 | 1.788 | 3.116 | 0.192 | 0.072 | 0.460 | 0.003 | 0.050 | 2.882 | 0.033 | 0.000 |
| Chrysophyta | 0.000 | 4.527 | 2.263 | 0.187 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Cryptophyta | 2.450 | 0.000 | 1.225 | 0.219 | 0.317 | 2.925 | 0.087 | 0.083 | 0.033 | 0.002 | 0.087 |
| Cyanobacteria | 34.305 | 31.855 | 33.080 | 60.616 | 367.837 | 7.362 | 31.117 | 154.514 | 62.867 | 6.166 | 8.388 |
| Dinophyta | 0.000 | 0.000 | 0.000 | 0.000 | 0.447 | 0.930 | 0.680 | 6.498 | 0.152 | 0.120 | 0.000 |
| Euglenophyta | 0.190 | 0.286 | 0.238 | 0.177 | 0.001 | 0.098 | 0.007 | 0.033 | 0.023 | 0.000 | 0.083 |
| Total | 41.558 | 38.943 | 40.250 | 62.097 | 368.831 | 15.122 | 33.333 | 163.382 | 81.938 | 6.422 | 8.563 |
| Taxonomic Richness | 24 | 14 | 19 | 8 | 8 | 11 | 6 | 11 | 10 | 5 | 5 |
| Cyanobacteria Cell Counts(k)/ml | 41.798 | 38.482 | 40.140 | 0.000 | 283.542 | 39.086 | 102.639 | 122.953 | 66.111 | 34.205 | 40.495 |
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