Crooked lake plot study 2011

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A small Lake research project to determine what would grow if Eurasian water milfoil was not present.

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Crooked lake plot study 2011

  1. 1. Potential for Native Aquatic Plant Growth after Control of Eurasian Watermilfoil 2011 Crooked Lake Plot Study James A. Johnson, M.S. Lake Scientist Freshwater Scientific Services, LLC 2011 Crooked Lake Plot Study James A. Johnson, M.S. Lake Scientist Freshwater Scientific Services, LLC
  2. 7. Lake Use Water Quality Pollution From Land Aquatic Plants Nutrients Fish
  3. 10. <ul><li>2011 Plot Study </li></ul><ul><li>Establish 6 study plots (early June) </li></ul><ul><li>Remove Eurasian milfoil from plots </li></ul><ul><li>Assess aquatic plant growth (late Aug) </li></ul>
  4. 11. <ul><li>Questions </li></ul><ul><li>What native plants will grow? </li></ul>
  5. 12. <ul><li>Questions </li></ul><ul><li>Will the abundance and diversity of native plants be sufficient to protect water clarity and provide fish habitat? </li></ul>
  6. 13. <ul><li>Questions </li></ul><ul><li>Will these native plants slow the reestablishment of Eurasian milfoil? </li></ul>
  7. 19. <ul><li>Water Depth </li></ul><ul><li>Types of plants </li></ul><ul><li>Plant Height </li></ul><ul><li>% Coverage </li></ul>
  8. 20. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>
  9. 21. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>Coontail
  10. 22. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>Coontail Muskgrass
  11. 23. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>Coontail Muskgrass Illinois Pondweed
  12. 24. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>Coontail Muskgrass Illinois Pondweed Sago Pondweed
  13. 25. <ul><li>Results </li></ul><ul><li>What types of plants </li></ul>Coontail Muskgrass Illinois Pondweed Sago Pondweed Bushy Pondweed
  14. 26. Results 2. How common was each type of plant? - % Occurrence 4 ÷ 9 = 44%
  15. 27. Results - % Occurrence
  16. 28. Results 2. How densely did each type of plant grow? % Cover Plant Height Water Depth Biovolume
  17. 29. Results - % Cover
  18. 30. Results - Plant Height
  19. 31. Results - % Biovolume
  20. 32. <ul><li>Summary of Findings </li></ul><ul><li>Treatments reduced milfoil </li></ul><ul><li>Regrowth of milfoil fragments in untreated plots </li></ul><ul><li>Coontail and Muskgrass dominant - dense, persistent “carpet” </li></ul><ul><li>Taller plant species also fairly common - should provide quality habitat for fish </li></ul><ul><li>Natural recruitment likely </li></ul>
  21. 33. Full Report Available for Download at…

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