| Report Year: 2009 |
| Black Hawk Lake, Sac County |
| Zooplankton |
| | 6/1/2009 | 7/6/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Suborder/Genus | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) | Dry Mass (μg/L) |
| Cladocera |
| Bosmina | 309.185 | 473.662 | 391.423 | 19.399 | 30.798 | 13.125 | 7.856 | 93.310 | 8.904 | 14.802 | 8.954 |
| Ceriodaphnia | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 2.401 | 1.012 | 0.000 | 0.000 | 0.000 | 2.776 |
| Daphnia | 68.023 | 52.728 | 60.375 | 64.148 | 51.139 | 94.503 | 81.704 | 57.833 | 71.005 | 76.896 | 85.977 |
| Copepoda |
| Calanoida | 131.879 | 152.115 | 141.997 | 65.507 | 124.535 | 107.673 | 159.677 | 178.756 | 176.021 | 83.370 | 32.379 |
| Cyclopoida | 40.546 | 162.156 | 101.351 | 11.863 | 18.552 | 48.286 | 7.230 | 19.086 | 12.993 | 35.839 | 28.290 |
| Nauplii | 29.736 | 38.854 | 34.295 | 19.932 | 42.176 | 21.212 | 34.251 | 28.707 | 10.829 | 11.586 | 20.127 |
| Nauplii |
| Nauplii | 29.736 | 38.854 | 34.295 | 19.932 | 42.176 | 21.212 | 34.251 | 28.707 | 10.829 | 11.586 | 20.127 |
| Rotifera |
| Asplanchna | 0.000 | 0.000 | 0.000 | 1.292 | 2.094 | 0.619 | 0.000 | 3.766 | 0.086 | 0.000 | 0.000 |
| Brachionus | 0.000 | 0.000 | 0.000 | 1.026 | 7.006 | 2.915 | 2.582 | 1.114 | 0.000 | 0.000 | 2.550 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.144 | 0.948 | 0.000 | 0.001 | 0.001 | 0.009 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.111 | 0.498 | 0.161 | 0.095 | 0.158 | 0.000 | 0.000 | 0.576 |
| Hexarthra | 0.000 | 0.000 | 0.000 | 0.000 | 0.182 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella cochlearis | 0.224 | 0.211 | 0.218 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella | 0.000 | 0.000 | 0.000 | 0.727 | 1.864 | 0.739 | 0.565 | 6.652 | 1.218 | 0.009 | 0.154 |
| Lecane | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.016 | 0.000 | 0.000 | 0.000 |
| Polyarthra | 0.000 | 0.000 | 0.000 | 0.291 | 0.204 | 0.912 | 0.547 | 51.062 | 0.000 | 0.000 | 0.000 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.000 | 0.096 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.041 | 0.592 | 0.107 | 0.260 | 0.013 | 0.000 | 0.000 | 0.000 |
| Total | 579.593 | 879.725 | 729.659 | 184.481 | 280.684 | 292.654 | 295.780 | 440.474 | 281.064 | 222.503 | 181.782 |
| Large Suspension Feeders (%) | 12 | 6 | 9 | 20 | 19 | 27 | 24 | 11 | 25 | 34 | 48 |
| Taxonomic Richness | 6 | 6 | 6 | 9 | 10 | 10 | 8 | 10 | 6 | 5 | 8 |
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