| Report Year: 2011 |
| Big Hollow Lake, Des Moines County |
| Phytoplankton |
| | 5/25/2011 | 7/13/2011 | 8/23/2011 | 2011 |
| Division | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) | Wet Mass (mg/L) |
| Bacillariophyta | 0.009 | 0.368 | 0.000 | 0.126 |
| Chlorophyta | 0.016 | 0.076 | 1.040 | 0.377 |
| Chrysophyta | 0.000 | 0.000 | 0.000 | 0.000 |
| Cryptophyta | 1.039 | 0.061 | 0.016 | 0.372 |
| Cyanobacteria | 1.758 | 13.365 | 26.505 | 13.876 |
| Euglenophyta | 0.031 | 0.035 | 0.000 | 0.022 |
| Total | 2.852 | 13.905 | 27.562 | 14.773 |
| Taxonomic Richness | 7 | 11 | 8 | 9 |
| Cyanobacteria Cell Counts(k)/ml | - | 42.828 | 68.727 | 55.778 |
|