| Report Year: 2009 |
| Lake Keomah, Mahaska County |
| Phytoplankton |
| | 6/16/2009 | 7/22/2009 | 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 | 4.865 | 0.422 | 2.643 | 0.013 | 0.405 | 0.097 | 0.124 | 0.042 | 1.597 | 0.001 | 0.787 |
| Chlorophyta | 0.000 | 0.000 | 0.000 | 0.000 | 0.010 | 522.910 | 0.036 | 0.030 | 0.000 | 0.004 | 0.124 |
| Cryptophyta | 0.432 | 0.936 | 0.684 | 0.143 | 0.054 | 1.627 | 0.061 | 0.030 | 0.024 | 0.013 | 0.652 |
| Cyanobacteria | 36.405 | 129.080 | 82.742 | 75.859 | 7.261 | 61.630 | 275.453 | 147.719 | 299.485 | 8.425 | 8.537 |
| Dinophyta | 3.710 | 6.748 | 5.229 | 0.000 | 1.386 | 1.401 | 0.282 | 0.000 | 0.496 | 0.004 | 0.000 |
| Euglenophyta | 0.720 | 0.119 | 0.419 | 0.005 | 0.194 | 0.111 | 0.026 | 0.000 | 0.009 | 0.000 | 0.000 |
| Total | 46.131 | 137.304 | 91.718 | 76.019 | 9.309 | 587.776 | 275.981 | 147.822 | 301.611 | 8.447 | 10.100 |
| Taxonomic Richness | 12 | 18 | 15 | 4 | 7 | 10 | 6 | 6 | 6 | 3 | 5 |
| Cyanobacteria Cell Counts(k)/ml | 26.026 | 138.302 | 82.164 | 0.000 | 12.404 | 99.174 | 249.095 | 123.324 | 213.339 | 39.195 | 42.377 |
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