| Report Year: 2009 |
| Arrowhead Pond (Pottawattamie), Pottawattamie County |
| Zooplankton |
| | 6/10/2009 | 7/14/2009 | 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 | 0.000 | 53.923 | 26.962 | 0.000 | 0.000 | 46.567 | 26.254 | 70.614 | 130.882 | 1.190 | 0.311 |
| Ceriodaphnia | 19.886 | 86.033 | 52.959 | 0.000 | 0.000 | 15.600 | 92.886 | 249.892 | 127.868 | 0.000 | 109.048 |
| Chydorus | 0.000 | 17.644 | 8.822 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Daphnia | 57.461 | 1.580 | 29.520 | 0.000 | 0.000 | 12.176 | 41.002 | 80.090 | 114.132 | 83.219 | 31.165 |
| Copepoda |
| Calanoida | 0.000 | 211.312 | 105.656 | 0.000 | 0.000 | 7.651 | 64.706 | 100.339 | 62.707 | 12.808 | 7.993 |
| Cyclopoida | 207.396 | 213.985 | 210.690 | 0.000 | 0.000 | 31.936 | 2.401 | 48.655 | 70.487 | 11.647 | 4.189 |
| Nauplii | 25.205 | 98.909 | 62.057 | 0.000 | 0.000 | 17.627 | 7.631 | 44.177 | 10.006 | 1.361 | 2.370 |
| Nauplii |
| Nauplii | 25.205 | 98.909 | 62.057 | 0.000 | 0.000 | 17.627 | 7.631 | 44.177 | 10.006 | 1.361 | 2.370 |
| Rotifera |
| Asplanchna | 2.654 | 14.457 | 8.556 | 0.000 | 0.000 | 2.328 | 3.930 | 4.345 | 0.000 | 0.000 | 0.000 |
| Brachionus | 0.000 | 1.115 | 0.558 | 0.000 | 0.000 | 0.424 | 0.139 | 0.428 | 0.107 | 0.000 | 0.000 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.005 | 0.000 | 0.001 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 1.153 | 0.000 | 0.480 | 0.000 | 0.000 | 0.040 |
| Kellicottia | 0.042 | 0.000 | 0.021 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.073 | 0.000 |
| Keratella cochlearis | 0.288 | 1.056 | 0.672 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella quadrata | 0.554 | 0.000 | 0.277 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.306 | 1.206 | 3.718 | 2.945 | 0.019 | 0.155 |
| Polyarthra | 0.000 | 1.176 | 0.588 | 0.000 | 0.000 | 0.089 | 0.000 | 0.000 | 0.000 | 0.000 | 0.094 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 4.362 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.155 | 0.000 | 0.000 | 0.160 |
| Total | 313.486 | 701.191 | 507.338 | 0.000 | 0.000 | 135.857 | 240.162 | 607.257 | 519.135 | 110.315 | 155.524 |
| Large Suspension Feeders (%) | 25 | 12 | 19 | - | - | 15 | 35 | 46 | 48 | 65 | 79 |
| Taxonomic Richness | 8 | 11 | 10 | - | - | 6 | 8 | 10 | 8 | 6 | 7 |
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