| Report Year: 2009 |
| Oldham Lake, Monona County |
| Phytoplankton |
| | 6/11/2009 | 7/15/2009 | 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 | 4.471 | 0.709 | 2.590 | 1.158 | 3.823 | 0.294 | 0.383 | 0.250 | 9.742 | 1.714 | 12.078 |
| Chlorophyta | 0.724 | 0.169 | 0.447 | 0.114 | 0.327 | 0.232 | 0.303 | 0.407 | 0.134 | 0.037 | 0.105 |
| Cryptophyta | 1.747 | 1.342 | 1.544 | 0.304 | 0.258 | 0.345 | 0.202 | 0.233 | 0.165 | 0.610 | 0.367 |
| Cyanobacteria | 264.993 | 47.566 | 156.280 | 10.667 | 20.439 | 12.583 | 26.630 | 14.284 | 3.105 | 5.377 | 2.039 |
| Dinophyta | 12.972 | 10.524 | 11.748 | 0.455 | 15.326 | 0.054 | 9.041 | 0.506 | 1.143 | 1.167 | 0.181 |
| Euglenophyta | 0.201 | 4.776 | 2.488 | 0.177 | 0.000 | 0.792 | 0.040 | 0.000 | 0.123 | 0.000 | 1.566 |
| Total | 285.107 | 65.086 | 175.096 | 12.874 | 40.173 | 14.301 | 36.600 | 15.679 | 14.411 | 8.905 | 16.337 |
| Taxonomic Richness | 18 | 28 | 23 | 9 | 12 | 12 | 13 | 11 | 11 | 5 | 9 |
| Cyanobacteria Cell Counts(k)/ml | 192.699 | 89.014 | 140.857 | 0.000 | 30.812 | 64.600 | 48.821 | 11.767 | 22.011 | 43.178 | 9.893 |
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