Upper Midwest Environmental Sciences Center
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Figure 4. |
Estimated density of midges (number per square meter; ±1 standard error) by study area, weighted by area of strata. Horizontal line indicates grand mean. |

**Sampling not conducted in 2003 because of budget constraints.



*Sampling not completed because of high water.
**Sampling not conducted in 2003 because of budget constraints.

*Sampling not completed because of high water.
**Sampling discontinued in 2001.

**Sampling not conducted in 2003 because of budget constraints.
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