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Nutrients in Missouri Reservoirs & the Quality of Our Waters

Nutrients in Missouri Reservoirs & the Quality of Our Waters . Jack Jones, Professor of Limnology Fisheries and Wildlife Sciences University of Missouri. Reservoir Water Quality. Think of this as Aquatic Agriculture -- with the aim of low yields The Crop -- ALGAE

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Nutrients in Missouri Reservoirs & the Quality of Our Waters

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  1. Nutrients in Missouri Reservoirs & the Quality of Our Waters Jack Jones, Professor of Limnology Fisheries and Wildlife Sciences University of Missouri

  2. Reservoir Water Quality Think of this as Aquatic Agriculture -- with the aim of low yields The Crop -- ALGAE Key elements – (same as lawn fertilizer) Phosphorus Nitrogen

  3. Funny Units -- µg/L Same as: • Part Per Billion • 1 Penney out of $10,000,000 • 1 minute out of 2000 years • 1 inch out of 16,000 miles Simply put, remarkably small

  4. Missouri Reservoirs – what do we want to know • What are they like ? • What determines their present condition ? • Are they changing with time? Dr. Edmondson (U of WA) about 1970 said lakes are being sampled systematically so we can begin to answer these questions.

  5. What we want to avoid

  6. Strong relationship between nutrients and algae in lakes worldwide

  7. Algae determine lake transparency

  8. Monitoring Program

  9. Three Key factors Nutrient loading (variable factor) Lake depth (fixed factor) Hydrology – size of the watershed (fixed factor)

  10. Missouri ReservoirsWhat controls them? Strong Pattern with Row Crop in the Basin

  11. Strong Pattern with Row Crop also describes P and N values in Iowa reservoirs

  12. Physiographic Sections in Missouri Glacial Plains [Big Rivers – oxbow & scour lakes] Osage Plains Ozark Border Ozark Highlands

  13. Strong regional patterns in nutrients Median value = 39 µg/L Median value = 740 µg/L Median value = 208 µS

  14. We know about Flushing Rate… Matter of design – position in the valley and dam height

  15. TP-crop relation has a shallow slope – suggests need to nearly eliminate crop to control nutrients

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