| Report Year: 2009 |
| Arrowhead Pond (Pottawattamie), Pottawattamie County |
| Phytoplankton |
| | 6/10/2009 | 7/14/2009 | 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 | 1.723 | 6.775 | 4.249 | 0.000 | 0.000 | 1.170 | 0.888 | 0.165 | 0.400 | 0.093 | 0.032 |
| Chlorophyta | 1.824 | 11.535 | 6.680 | 0.000 | 0.000 | 1.656 | 0.804 | 5.321 | 0.007 | 0.136 | 0.032 |
| Chrysophyta | 2.191 | 0.185 | 1.188 | 0.000 | 0.000 | 0.000 | 0.000 | 0.031 | 0.000 | 0.000 | 0.000 |
| Cryptophyta | 0.370 | 0.000 | 0.185 | 0.000 | 0.000 | 0.366 | 0.012 | 0.136 | 0.063 | 0.061 | 0.087 |
| Cyanobacteria | 43.040 | 88.875 | 65.958 | 0.000 | 0.000 | 26.654 | 230.420 | 35.297 | 97.359 | 66.467 | 144.570 |
| Dinophyta | 5.896 | 0.000 | 2.948 | 0.000 | 0.000 | 0.000 | 0.000 | 0.416 | 13.406 | 0.456 | 0.320 |
| Euglenophyta | 0.000 | 0.022 | 0.011 | 0.000 | 0.000 | 0.301 | 0.000 | 0.068 | 0.000 | 0.000 | 0.000 |
| Total | 55.044 | 107.391 | 81.218 | 0.000 | 0.000 | 30.146 | 232.125 | 41.434 | 111.235 | 67.214 | 145.041 |
| Taxonomic Richness | 32 | 44 | 38 | 0 | 0 | 10 | 6 | 11 | 5 | 6 | 6 |
| Cyanobacteria Cell Counts(k)/ml | 32.440 | 85.430 | 58.935 | 0.000 | 0.000 | 130.457 | 166.397 | 93.298 | 131.379 | 61.954 | 119.378 |
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