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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 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
Total Phosphorus KR 1-KR10 b/l Libby Dam KR 14 Above Dam
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
Added Nutrients Showing Little Effect on overall WQ (Hoyle 2006) Soluble Reactive Phosphorus Total Phosphorus
2005 ALGAL GROWTH11X INCREASE IN PP, ~1 km Below addition point; 2X, ~30 km downriver SUMMER, PHOSPHORUS ADDED SPRING, NO P ADDED S
2004 v. 2006 INVERT BIOMASS (fall) TS TS CS
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