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KOOTENAI RIVER ECOSYSTEM PROJECT

KOOTENAI RIVER ECOSYSTEM PROJECT. USING AN ECOSYSTEM APPROACH TO EVALUATE FISHERIES DECLINES IN A 6 TH ORDER REGULATED RIVER IN NORTHERN IDAHO, USA. Charlie Holderman, Kootenai Tribe of Idaho Ryan Hardy, Idaho Dept. Fish & Game. NUTRIENT SUMMARY; ABOVE & BELOW LIBBY D. 2003 data (n=209).

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KOOTENAI RIVER ECOSYSTEM PROJECT

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  1. KOOTENAI RIVER ECOSYSTEM PROJECT USING AN ECOSYSTEM APPROACH TO EVALUATE FISHERIES DECLINES IN A 6TH ORDER REGULATED RIVER IN NORTHERN IDAHO, USA Charlie Holderman, Kootenai Tribe of Idaho Ryan Hardy, Idaho Dept. Fish & Game

  2. NUTRIENT SUMMARY; ABOVE & BELOW LIBBY D.2003 data (n=209)

  3. Total Phosphorus KR 1-KR10 b/l Libby Dam KR 14 Above Dam

  4. SUMMARY KR NUTRIENT EXPERIMENT Plan (2005-2009) • 1 ST YR. ADD 1.5 ug TDP • 2 nd & 3rd yr add 3.0 ug TDP • Add Nutrients in Summer & Early Fall Period • 4 th and 5th yrs, 3.0 ug TDP continued • Evaluate After 5th year, Decide whether to Continue

  5. Added Nutrients Showing Little Effect on overall WQ (Hoyle 2006) Soluble Reactive Phosphorus Total Phosphorus

  6. 2005 ALGAL GROWTH11X INCREASE IN PP, ~1 km Below addition point; 2X, ~30 km downriver SUMMER, PHOSPHORUS ADDED SPRING, NO P ADDED S

  7. 2004 v. 2006 INVERT BIOMASS (fall) TS TS CS

  8. SUMMARY KR NUTRIENT EXPERIMENT RESULTS SO FAR (2005-2007) • No Adverse Effects to Water Quality • Significant increase in Algae Production • 10-15 X Control • Significant increase in Aquatic Insect Production • 3-5 X Control • Fish Community, 3rd yr Data under review • Should start to see effects this year

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