2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019 | 2:45 PM - 3:00 PM | RIVER MANAGEMENT ALTERS ECOSYSTEM METABOLISM IN THE LARGE OLIGOTROPHIC KOOTENAI RIVER | 253 AB

RIVER MANAGEMENT ALTERS ECOSYSTEM METABOLISM IN THE LARGE OLIGOTROPHIC KOOTENAI RIVER

Recovery efforts for endangered Kootenai River white sturgeon, including modified Libby Dam operations and habitat restoration, have been implemented in the transboundary (U.S. – Canada) Kootenai River watershed. We characterized the response of gross primary production (GPP) and ecosystem respiration (ER) in reaches with unregulated flow, regulated flow, nutrient addition, and habitat restoration. GPP and ER generally increased downstream from reaches with unregulated flow (3.07 ± 0.14 GPP, -3.19 ± 0.17 ER, g O2 m-2 d-1, mean ± standard error) to regulated flow (6.14 ± 0.19, -7.51 ± 0.1 9), nutrient addition (7.28 ± 0.16, -7.15 ± 0.16), and habitat restoration (12.14 ± 0.96, -15.77 ± 1.77). As biofilm accumulated in this nutrient poor river, we observed low initial values in spring (2.96 ± 0.11, -5.60 ± 0.20), followed by elevated values in mid-summer (8.59 ± 0.16, -8.55 ± 0.20), and a return to low values in late summer and fall (5.76 ± 0.20, -6.20 ± 0.32), although the timing of elevated GPP and ER differed among reaches. As reflected by GPP and ER, river management may alter the timing and amount of autochthonous carbon available to the food web.

Food Webs
Carbon
Primary Production

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Presenters/Authors

Lisa Kunza (), South Dakota School of Mines and Technology, lisa.kunza@sdsmt.edu;