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Research Student: Jennifer Webb Research Advisor: Christopher Kodani Ph.D.

The Threshold of Ephemeroptera Sustainability Within Small Streams of the Upper Ocmulgee Watershed. Research Student: Jennifer Webb Research Advisor: Christopher Kodani Ph.D. Introduction. Previous research Stream quality vs. land usage Macroinvertebrates

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Research Student: Jennifer Webb Research Advisor: Christopher Kodani Ph.D.

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  1. The Threshold of Ephemeroptera Sustainability Within Small Streams of the Upper Ocmulgee Watershed Research Student: Jennifer Webb Research Advisor: Christopher Kodani Ph.D.

  2. Introduction • Previous research • Stream quality vs. land usage • Macroinvertebrates • Vary in sensitivity to environment • Good indicator of quality within streams • Surrounding area correlates to stream quality

  3. Mayflies • Ephemeroptera • Characteristic traits: • Long, flat bodies • 3 tails • Gills • Sensitive • Shredders • CPOM • Algae • Detritus

  4. Purpose of Study • To determine the specific type of woody debris mayfly larvae prefer.

  5. Materials & Methods • GA Adopt-A-Stream Monitoring Protocols • Physical • Chemical • Biological • Streambed • vegetative banks • woody debris • Was not adequate • Visual linear assessments • Small woody debris • Logs/meter • Data • Collected between January and March 2008 • Sampled 7 sites of different land usage.

  6. Land Usage Parking Lot

  7. Land Usage Suburban Park

  8. Land Usage Forest

  9. Results Sum of Ephemeroptera per Land Usage Type Small Woody Debris & Logs/m per Land Usage Type Parking Lot Sub Park Forest Parking Lot Sub Park Forest

  10. Linear Regression • Tests for relationship between X and Y values • R2 ranges from 0 to 1 • 0 = no relationship (Sample B) • 1 = complete relationship (Sample A)

  11. Is There Any Relationship?

  12. Results Mayflies vs. Avg. Small Woody Debris Mayflies vs. Logs/m Mayflies Mayflies Avg. Small Woody Debris Logs/m R2woody=0.005 R2logs=0.84

  13. Conclusions • Mayfly larvae prefer coarse woody debris • Need more sites!!! • 1-2 logs/m range • Future research: • Is there an interaction between substrate type, mayflies & woody debris?

  14. Acknowledgements • Dr. Christopher Kodani • Anne Stahley & Brett Williams • James Moore • Clayton State University • Dept. of Natural Sciences • Georgia Adopt-A-Stream • Henry County Water Authority • Stockbridge High School • Panola Mountain State Park • Hidden Valley Park • Duffey Park • Gardner Park

  15. Questions?

  16. DO Analysis • 8 drops Manganous Sulfate • 8 drops Alkaline Potassium Iodide Azide • Invert • 8 drops Sulfuric Acid • Titration • Used Sodium Thiosulfate • Added starch indicator when pale yellow

  17. pH

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