| Report Year: 2009 |
| Mitchell Lake, Black Hawk County |
| Phytoplankton |
| | 6/24/2009 | 7/29/2009 | 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 | 0.267 | 1.611 | 0.939 | 0.000 | 0.000 | 2.080 | 0.186 | 0.340 | 1.079 | 0.171 | 2.955 |
| Chlorophyta | 0.096 | 22.032 | 11.064 | 0.000 | 0.000 | 1.285 | 0.567 | 0.153 | 0.193 | 0.568 | 1.833 |
| Chrysophyta | 0.067 | 0.000 | 0.033 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.004 |
| Cryptophyta | 2.124 | 0.719 | 1.421 | 0.000 | 0.000 | 1.759 | 0.395 | 0.067 | 0.035 | 0.069 | 2.588 |
| Cyanobacteria | 15.128 | 17.280 | 16.204 | 0.000 | 0.000 | 122.065 | 192.445 | 32.952 | 23.350 | 0.204 | 1.771 |
| Dinophyta | 3.613 | 0.000 | 1.806 | 0.000 | 0.000 | 0.595 | 0.196 | 0.295 | 0.518 | 11.244 | 1.343 |
| Euglenophyta | 0.037 | 0.928 | 0.483 | 0.000 | 0.000 | 0.291 | 0.093 | 0.044 | 0.019 | 0.026 | 0.341 |
| Total | 21.331 | 42.570 | 31.950 | 0.000 | 0.000 | 128.075 | 193.883 | 33.850 | 25.194 | 12.282 | 10.835 |
| Taxonomic Richness | 30 | 26 | 28 | 0 | 0 | 23 | 11 | 10 | 9 | 9 | 9 |
| Cyanobacteria Cell Counts(k)/ml | 26.390 | 15.719 | 21.055 | 0.000 | 0.000 | 110.473 | 143.407 | 36.322 | 23.248 | 0.680 | 3.170 |
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