| Report Year: 2009 |
| Lake Keomah, Mahaska County |
| Zooplankton |
| | 6/16/2009 | 7/22/2009 | 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 | 7.393 | 1.558 | 4.475 | 4.565 | 0.126 | 0.000 | 28.327 | 10.856 | 2.055 | 3.278 | 0.000 |
| Ceriodaphnia | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 4.201 | 0.000 | 2.108 | 4.315 | 0.000 |
| Daphnia | 51.484 | 123.660 | 87.572 | 136.010 | 429.462 | 110.061 | 42.480 | 132.088 | 25.467 | 97.080 | 0.000 |
| Copepoda |
| Calanoida | 0.000 | 60.243 | 30.122 | 16.089 | 13.517 | 40.925 | 68.869 | 40.823 | 7.730 | 79.020 | 21.229 |
| Cyclopoida | 21.510 | 9.590 | 15.550 | 3.789 | 12.178 | 1.238 | 8.448 | 9.008 | 10.987 | 168.171 | 10.535 |
| Nauplii | 10.860 | 6.620 | 8.740 | 6.345 | 0.980 | 5.991 | 19.979 | 5.185 | 4.773 | 7.187 | 5.760 |
| Nauplii |
| Nauplii | 10.860 | 6.620 | 8.740 | 6.345 | 0.980 | 5.991 | 19.979 | 5.185 | 4.773 | 7.187 | 5.760 |
| Rotifera |
| Asplanchna | 0.000 | 6.152 | 3.076 | 0.003 | 6.607 | 3.689 | 13.752 | 0.000 | 0.000 | 4.869 | 0.000 |
| Brachionus | 0.000 | 0.000 | 0.000 | 0.121 | 0.081 | 3.323 | 0.626 | 2.253 | 1.056 | 0.036 | 0.256 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.000 | 0.007 | 0.000 | 0.001 | 0.000 | 0.000 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.000 | 0.022 | 0.175 | 0.344 | 0.014 | 0.204 | 0.285 | 0.000 |
| Hexarthra | 0.000 | 0.000 | 0.000 | 0.000 | 0.050 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella cochlearis | 0.000 | 0.084 | 0.042 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella quadrata | 0.000 | 0.295 | 0.147 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella | 0.000 | 0.000 | 0.000 | 0.972 | 0.916 | 1.135 | 4.303 | 1.276 | 7.179 | 0.131 | 0.005 |
| Lecane | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.216 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Monostyla | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.059 | 0.000 | 0.000 | 0.000 | 0.000 |
| Polyarthra | 0.051 | 0.747 | 0.399 | 0.143 | 2.036 | 14.604 | 0.000 | 0.000 | 0.503 | 0.900 | 0.000 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.003 | 0.000 | 0.016 | 0.077 | 0.000 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.887 | 2.112 | 0.324 | 0.048 | 0.185 | 0.000 |
| Total | 91.298 | 208.950 | 150.124 | 168.039 | 465.983 | 182.260 | 193.578 | 201.829 | 62.110 | 365.458 | 37.784 |
| Large Suspension Feeders (%) | 56 | 59 | 58 | 84 | 55 | 27 | 39 | 24 | 46 | 45 | 0 |
| Taxonomic Richness | 5 | 9 | 7 | 8 | 8 | 7 | 9 | 5 | 6 | 9 | 5 |
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