| Report Year: 2009 |
| Pleasant Creek Lake, Linn County |
| Zooplankton |
| | 6/23/2009 | 7/28/2009 | 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 | 0.000 | 0.439 | 0.213 | 0.253 | 0.000 | 0.083 |
| Daphnia | 0.189 | 0.000 | 0.095 | 3.128 | 0.000 | 9.767 | 85.740 | 62.899 | 63.430 | 61.640 | 0.293 |
| Copepoda |
| Calanoida | 9.928 | 8.430 | 9.179 | 11.868 | 25.374 | 9.896 | 27.301 | 61.813 | 39.392 | 47.551 | 11.884 |
| Cyclopoida | 0.000 | 0.767 | 0.383 | 3.473 | 0.000 | 7.221 | 0.356 | 6.349 | 4.569 | 12.644 | 3.159 |
| Nauplii | 2.416 | 8.273 | 5.345 | 1.484 | 2.709 | 1.303 | 7.394 | 5.620 | 5.033 | 4.402 | 0.771 |
| Nauplii |
| Nauplii | 2.416 | 8.273 | 5.345 | 1.484 | 2.709 | 1.303 | 7.394 | 5.620 | 5.033 | 4.402 | 0.771 |
| Rotifera |
| Ascomorpha | 0.090 | 0.000 | 0.045 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Asplanchna | 0.000 | 0.000 | 0.000 | 0.004 | 0.000 | 0.028 | 3.022 | 0.000 | 0.010 | 0.000 | 0.000 |
| Brachionus | 0.000 | 0.000 | 0.000 | 0.135 | 0.550 | 0.340 | 0.851 | 0.056 | 0.004 | 0.000 | 0.000 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.055 | 0.000 | 0.000 | 0.000 | 0.001 | 0.000 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.009 | 0.000 | 0.003 | 0.000 | 0.010 | 0.000 | 0.000 | 0.000 |
| Keratella cochlearis | 0.413 | 0.521 | 0.467 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella | 0.000 | 0.000 | 0.000 | 0.060 | 0.014 | 0.128 | 0.191 | 0.303 | 0.073 | 0.855 | 0.025 |
| Lecane | 0.000 | 0.000 | 0.000 | 0.003 | 0.020 | 0.000 | 0.000 | 0.000 | 0.103 | 0.321 | 0.000 |
| Macrochaetus | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.381 |
| Monostyla | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 3.919 | 0.000 |
| Polyarthra | 0.445 | 0.202 | 0.323 | 0.486 | 0.462 | 0.247 | 1.008 | 0.168 | 0.246 | 0.098 | 0.254 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.021 | 0.006 | 0.018 | 0.171 | 1.185 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.008 | 0.000 | 0.018 | 0.630 | 0.089 | 0.000 | 0.022 | 0.000 |
| Total | 13.481 | 18.193 | 15.837 | 20.734 | 29.136 | 28.969 | 127.105 | 138.707 | 113.115 | 131.452 | 16.852 |
| Large Suspension Feeders (%) | 1 | 0 | 1 | 9 | 0 | 13 | 48 | 34 | 34 | 35 | 2 |
| Taxonomic Richness | 6 | 5 | 6 | 9 | 5 | 7 | 7 | 7 | 8 | 6 | 6 |
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