Boardman 2007

1. The Effects of A Sediment Trap on Benthic Macroinvertebrate Populations in the North Branch of the Boardman River Whitney Nelson, Calvin College Adviser: Daniel Ippolito, Anderson University

3. Boardman Watershed and Uses

4. Michigan Sand

5. Unfortunate Sand Events:

6. Effects of River Sedimentation

7. Sand Trap

9. Sampling Site Locations

10. Sampling Methods Kick-net Surber Sampler

11. Upstream Sites

12. Downstream Sites

13. Sample Identification

14. Common Macroinvertebrates: Ephemerellidae, Drunella Leptohyphidae, Tricorythodes Heptageniidae, Heptagenia

15. Common Macroinvertebrates: Brachycentridae, Brachycentrus Heliocopsychidae, Heliocopsyche

16. Common Macroinvertebrates: Elmidae, Opitoservus (larvae and adult) Athericidae, Atherix Chironomidae

17. Population Percentages

18. Simpson’s Indices and Chi-Squared Test Upstream Downstream Taxa Richness (# of Morphospecies) 77 89 # of individuals 5611 6813 Dominance (D) 0.1099 0.0844 Simpson (1-D) 0.8901 0.9156

19. “ EPT” Ratio Index and Chi-Squared Values Upstream Downstream EPT ratio Average 21.1 31.4 "EPT" ratio index. The sum of E + T+ P / # Chronomid larvae (Crawford and Lenat, 1989)

20. Comparisons…

21. Functional Group Comparisons Collector-gatherer Collector-filterers Scrapers Predators Others Upstream 10.2% 41.7% 28.6% 13.4% 6.0% Downstream 21.4% 37.0% 28.7% 10.9% 2.0%

22. Brachycentrus Location