| Report Year: 2009 |
| Black Hawk Lake, Sac County |
| Phytoplankton |
| | 6/1/2009 | 7/6/2009 | 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 | 1.586 | 0.761 | 1.173 | 4.062 | 5.344 | 12.572 | 0.911 | 1.483 | 5.095 | 0.242 | 1.558 |
| Chlorophyta | 1.797 | 0.114 | 0.956 | 0.345 | 0.627 | 0.767 | 0.868 | 0.498 | 1.271 | 0.045 | 0.176 |
| Chrysophyta | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.002 | 0.000 | 0.000 | 0.158 | 0.000 | 0.000 |
| Cryptophyta | 0.087 | 0.065 | 0.076 | 0.000 | 0.078 | 0.067 | 0.107 | 0.412 | 0.017 | 0.025 | 0.669 |
| Cyanobacteria | 107.385 | 121.343 | 114.364 | 97.604 | 119.731 | 9.802 | 34.383 | 16.392 | 276.760 | 6.789 | 44.962 |
| Dinophyta | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.075 | 0.092 | 0.000 | 0.022 | 0.000 | 0.000 |
| Euglenophyta | 0.000 | 0.081 | 0.041 | 0.000 | 0.000 | 0.167 | 0.194 | 0.108 | 0.000 | 0.033 | 0.165 |
| Total | 110.855 | 122.365 | 116.610 | 102.012 | 125.780 | 23.452 | 36.556 | 18.893 | 283.323 | 7.134 | 47.531 |
| Taxonomic Richness | 20 | 22 | 21 | 9 | 15 | 21 | 15 | 10 | 10 | 6 | 4 |
| Cyanobacteria Cell Counts(k)/ml | 113.763 | 246.513 | 180.138 | 0.000 | 145.552 | 8.735 | 51.654 | 85.261 | 211.231 | 38.184 | 249.981 |
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