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Zooplankton Analysis at Ox Ranch: Management Implications for Pond Health

Explore the zooplankton assessment at Ox Ranch focusing on comparing offshore and onshore zones, Daphnia abundance, biomass, and implications for pond management. Suggestions for macrophyte removal, dredging, fish habitat enhancement, and overall pond status are highlighted.

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Zooplankton Analysis at Ox Ranch: Management Implications for Pond Health

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  1. Pond Zooplankton Analysis at OX Ranch Grace Gardner, Joe Buchanan, Casey Kristofferson

  2. Outline • Background • Methods • Data • Results • Management • Summary

  3. Background • Purpose of ponds • Macrophytes • Location- middle pond • Zooplankton Assessment • October 7th and 8th

  4. Methods • Onshore vs. Offshore • Equipment • Sampling • Lab Analysis • Reasoning

  5. Onshore vs. Offshore X Volume of offshore= 14015 m^3 Volume of onshore =1300 m^3 X X X Black X: Offshore sites Gray X: Onshore sites X X

  6. Sampling wildco.com vesr.ucnrs.org

  7. Reasoning: Daphnia • Pond Community • Role of Daphnia

  8. Data and Results • Comparisons of Offshore and Onshore zones • Abundances of all Zooplankton genera present • Average length of zooplankton • Average length of Daphnia specifically • Average biomass of Daphnia • If time permits: abundances between night and day within the offshore zone

  9. Large-bodied Daphnia benefits • Burns et al. 1968, found a correlation between length of zooplankton and diameter of particle able to filter • This means that the larger-bodied zooplankton within onshore zone are providing top-down control upon algal blooms • Management implications with removal of these zooplankton (Burns 1968)

  10. (Burns 1968)

  11. Daphnia length range: 0.30928- 2.7062mm

  12. Management • Ox Ranch Plan • Suggestions • Role of management plan

  13. Pond Status • Pond is in great condition for Daphnia. • High densities of Macrophytes • Good for daphnia • Bad for fish

  14. Management Suggestion • Macrophyte removal • Dredging • Fish habitat • Fish stocking • Shading • Role

  15. Macrophyte Removal • Remove 30-40% of macrophytes • Mostly near/around dock • Significance

  16. Dredging • 3 meters deep • In front of dock • Depth for fish habitat

  17. Fish habitat • Brush piles in open water • In dredging area • Christmas trees, brush, anything. • (Bassett et al. 1994)

  18. Stocking • Conservative • Fish population boom at beginning • Ecosystem reaction

  19. Shading • Plant willows • Shading of pond • Bank stabilization

  20. Role of Management plan • Economically effective • Maintain balance • Supply fishing opportunities

  21. Summary • Background • Methods • Data • Results • Management • Questions?

  22. Citations • Bassett, C. E. 1994. Use and evaluation of fish habitat structures in lakes of the eastern United States by the USDA Forest Service.  Bulletin of Marine Science, 55: 1137-1148. http://idahoid.library.ingentaconnect.com/content/umrsmas/bullmar/1994/00000055/F0020002/art00070 • Burks, R.L., Jeppersen, E., and Lodge, D.M. 2001. Littoral zone structure as Daphnia refugia against fish predators. Limnology and Oceanography 46: 230-237. • Burns, C.W. 1968. The relationship between body size of filter-feeding cladocera and the maximum size of particle ingested. Limnology and Oceanography 13: 675-678. • Wetzel, R.G. 2001. Limnology. 3rd Ed. Academic Press, San Diego, CA, U.S.A.

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