| Report Year: 2009 |
| Otter Creek Lake, Tama County |
| Zooplankton |
| | 6/22/2009 | 7/27/2009 | 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 | 0.000 | 0.000 | 0.000 | 0.000 | 13.832 | 5.960 | 17.651 | 19.992 | 21.047 | 0.111 |
| Ceriodaphnia | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 7.605 | 0.000 |
| Chydorus | 0.000 | 1.895 | 0.948 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Daphnia | 29.775 | 116.488 | 73.131 | 0.000 | 0.000 | 15.236 | 226.577 | 173.989 | 6.895 | 29.117 | 1.513 |
| Copepoda |
| Calanoida | 0.000 | 164.725 | 82.362 | 0.000 | 0.000 | 32.413 | 69.619 | 184.949 | 44.752 | 86.319 | 2.016 |
| Cyclopoida | 6.384 | 257.418 | 131.901 | 0.000 | 0.000 | 17.416 | 41.464 | 4.677 | 9.966 | 69.447 | 2.905 |
| Nauplii | 19.857 | 53.368 | 36.612 | 0.000 | 0.000 | 12.614 | 36.092 | 21.828 | 21.754 | 25.365 | 4.192 |
| Nauplii |
| Nauplii | 19.857 | 53.368 | 36.612 | 0.000 | 0.000 | 12.614 | 36.092 | 21.828 | 21.754 | 25.365 | 4.192 |
| Rotifera |
| Asplanchna | 27.620 | 0.000 | 13.810 | 0.000 | 0.000 | 0.055 | 0.000 | 0.000 | 0.000 | 5.860 | 0.000 |
| Brachionus | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.034 | 0.000 | 0.000 | 0.143 | 0.048 | 0.000 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.020 | 0.056 | 0.012 | 0.002 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.198 | 0.789 | 0.612 | 0.000 | 0.000 | 0.000 |
| Kellicottia | 0.067 | 0.847 | 0.457 | 0.000 | 0.000 | 0.231 | 0.044 | 0.253 | 0.000 | 0.000 | 0.000 |
| Keratella cochlearis | 3.598 | 2.302 | 2.950 | 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 | 0.179 | 0.920 | 1.478 | 0.792 | 0.162 | 0.001 |
| Lecane | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.071 | 0.000 | 0.000 |
| Polyarthra | 10.264 | 12.628 | 11.446 | 0.000 | 0.000 | 0.353 | 0.315 | 0.739 | 0.533 | 2.037 | 0.025 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.246 | 2.358 | 1.105 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.085 | 0.237 | 0.344 | 1.145 | 0.000 | 0.000 |
| Total | 97.563 | 609.671 | 353.617 | 0.000 | 0.000 | 92.911 | 384.431 | 407.637 | 106.045 | 247.007 | 10.763 |
| Large Suspension Feeders (%) | 31 | 19 | 25 | - | - | 21 | 58 | 50 | 7 | 17 | 12 |
| Taxonomic Richness | 7 | 8 | 8 | - | - | 11 | 10 | 10 | 8 | 8 | 5 |
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