| Report Year: 2009 |
| Arbor Lake, Poweshiek County |
| Zooplankton |
| | 6/15/2009 | 7/20/2009 | 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 | 5.997 | 185.427 | 95.712 | 1.258 | 1.022 | 0.000 | 0.706 | 93.547 | 0.000 | 0.080 | 0.488 |
| Daphnia | 51.701 | 204.714 | 128.207 | 29.754 | 127.074 | 0.000 | 179.777 | 49.392 | 9.818 | 70.040 | 27.059 |
| Copepoda |
| Calanoida | 14.950 | 0.000 | 7.475 | 46.008 | 44.221 | 0.000 | 207.261 | 33.579 | 10.463 | 12.429 | 1.681 |
| Cyclopoida | 32.135 | 148.673 | 90.404 | 32.583 | 30.510 | 0.000 | 81.847 | 38.439 | 48.389 | 14.300 | 46.998 |
| Nauplii | 25.580 | 86.720 | 56.150 | 11.401 | 10.590 | 0.000 | 39.408 | 24.563 | 19.409 | 0.395 | 11.804 |
| Nauplii |
| Nauplii | 25.580 | 86.720 | 56.150 | 11.401 | 10.590 | 0.000 | 39.408 | 24.563 | 19.409 | 0.395 | 11.804 |
| Rotifera |
| Asplanchna | 0.000 | 0.000 | 0.000 | 0.564 | 0.847 | 0.000 | 0.000 | 137.474 | 0.000 | 0.000 | 0.000 |
| Brachionus | 0.000 | 0.000 | 0.000 | 0.250 | 0.355 | 0.000 | 0.148 | 0.244 | 0.534 | 0.000 | 0.000 |
| Conochilus | 0.000 | 0.000 | 0.000 | 0.000 | 0.059 | 0.000 | 0.000 | 0.019 | 0.000 | 0.000 | 0.000 |
| Filinia | 0.000 | 0.000 | 0.000 | 0.000 | 0.571 | 0.000 | 0.000 | 0.118 | 0.538 | 0.000 | 0.038 |
| Keratella cochlearis | 0.477 | 1.706 | 1.092 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Keratella | 0.000 | 0.000 | 0.000 | 0.123 | 0.230 | 0.000 | 0.287 | 0.878 | 10.591 | 0.193 | 0.083 |
| Lecane | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.020 | 0.000 |
| Monostyla | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.073 | 0.000 | 0.000 |
| Polyarthra | 0.000 | 1.949 | 0.975 | 0.005 | 0.026 | 0.000 | 0.000 | 0.557 | 0.438 | 0.000 | 0.000 |
| Pompholx | 0.000 | 0.000 | 0.000 | 0.000 | 0.050 | 0.000 | 0.026 | 0.000 | 0.000 | 0.000 | 0.000 |
| Trichocerca | 0.000 | 0.000 | 0.000 | 0.029 | 0.051 | 0.000 | 0.000 | 0.009 | 4.379 | 0.000 | 0.000 |
| Total | 130.840 | 629.189 | 380.014 | 121.976 | 215.606 | 0.000 | 509.461 | 378.819 | 104.633 | 97.458 | 88.151 |
| Large Suspension Feeders (%) | 40 | 33 | 36 | 18 | 61 | - | 44 | 8 | 8 | 65 | 26 |
| Taxonomic Richness | 6 | 6 | 6 | 6 | 8 | - | 6 | 8 | 7 | 5 | 6 |
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