| Report Year: 2009 |
| Arbor Lake, Poweshiek County |
| Phytoplankton |
| | 6/15/2009 | 7/20/2009 | 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 | 0.169 | 1.910 | 1.040 | 0.755 | 0.290 | 0.000 | 0.070 | 0.071 | 0.894 | 0.729 | 1.622 |
| Chlorophyta | 0.000 | 7.696 | 3.848 | 0.512 | 0.287 | 0.000 | 0.068 | 0.916 | 4.874 | 0.125 | 1.293 |
| Chrysophyta | 0.000 | 0.300 | 0.150 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.046 | 0.000 | 0.000 |
| Cryptophyta | 0.000 | 3.256 | 1.628 | 0.635 | 0.164 | 0.000 | 0.460 | 1.575 | 0.114 | 4.125 | 1.585 |
| Cyanobacteria | 312.806 | 104.176 | 208.491 | 316.588 | 59.518 | 0.000 | 37.666 | 0.556 | 54.892 | 3.120 | 3.016 |
| Dinophyta | 0.000 | 0.000 | 0.000 | 2.030 | 0.471 | 0.000 | 0.000 | 0.000 | 0.297 | 4.265 | 3.364 |
| Euglenophyta | 0.135 | 0.048 | 0.092 | 0.272 | 0.000 | 0.000 | 0.046 | 0.034 | 0.015 | 0.000 | 0.927 |
| Total | 313.111 | 117.385 | 215.248 | 320.792 | 60.731 | 0.000 | 38.310 | 3.152 | 61.132 | 12.364 | 11.806 |
| Taxonomic Richness | 14 | 30 | 22 | 8 | 8 | 0 | 7 | 9 | 7 | 6 | 10 |
| Cyanobacteria Cell Counts(k)/ml | 223.725 | 129.712 | 176.718 | 0.000 | 104.144 | 0.000 | 89.273 | 4.266 | 39.279 | 15.558 | 9.932 |
|