| Report Year: 2009 |
| Otter Creek Lake, Tama 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 | 2.408 | 9.878 | 6.143 | 0.000 | 0.000 | 0.764 | 0.947 | 0.091 | 2.162 | 0.273 | 2.519 |
| Chlorophyta | 0.579 | 0.000 | 0.289 | 0.000 | 0.000 | 0.060 | 0.803 | 0.809 | 0.986 | 1.635 | 2.438 |
| Chrysophyta | 0.087 | 9.734 | 4.911 | 0.000 | 0.000 | 0.000 | 0.000 | 0.222 | 0.065 | 0.000 | 0.000 |
| Cryptophyta | 7.673 | 3.308 | 5.490 | 0.000 | 0.000 | 0.553 | 0.169 | 0.230 | 0.065 | 0.686 | 2.016 |
| Cyanobacteria | 64.765 | 75.644 | 70.204 | 0.000 | 0.000 | 27.408 | 25.197 | 44.582 | 53.774 | 2.750 | 2.832 |
| Dinophyta | 8.926 | 3.714 | 6.320 | 0.000 | 0.000 | 0.085 | 0.253 | 0.137 | 0.552 | 0.000 | 1.587 |
| Euglenophyta | 0.063 | 1.496 | 0.780 | 0.000 | 0.000 | 0.303 | 0.046 | 0.127 | 0.000 | 0.000 | 0.485 |
| Total | 84.501 | 103.775 | 94.138 | 0.000 | 0.000 | 29.173 | 27.414 | 46.198 | 57.605 | 5.343 | 11.877 |
| Taxonomic Richness | 28 | 26 | 27 | 0 | 0 | 8 | 11 | 10 | 10 | 5 | 7 |
| Cyanobacteria Cell Counts(k)/ml | 74.026 | 186.444 | 130.235 | 0.000 | 0.000 | 175.752 | 72.055 | 82.380 | 47.548 | 5.508 | 14.006 |
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