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March 13 - 15, 2022

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6/05/2017  |   2:00 PM - 2:15 PM   |  THE INFLUENCE OF CLADOPHORA ALGAE ON PHYSICOCHEMICAL AND BIOGEOCHEMICAL CONDITIONS OF THE UPPER CLARK FORK RIVER, MONTANA   |  306A

THE INFLUENCE OF CLADOPHORA ALGAE ON PHYSICOCHEMICAL AND BIOGEOCHEMICAL CONDITIONS OF THE UPPER CLARK FORK RIVER, MONTANA

Cladophora glomerata routinely generates nuisance blooms in the Upper Clark Fork River, MT. This study characterized the influence of biomass on how conditions of the benthic environment may differ from the overlying water column throughout the growing season. Biomass and biogeochemical conditions were monitored at three sites over roughly 150 river km. Abundance of benthic organic matter (BOM) was tracked along with stream physical and chemical features. Localized sampling of near-bottom and water-column physicochemical (DO, % saturation, temperature, ORP, pH) and biogeochemical (NH??, NO??, SRP, DOC) character provided measures of conditions in these two zones of the river. River-average biomass (as AFDM, g/m²) peaked at 168.8 (± 32.2 SE) during June and then declined to 10.5 (± 3.4 SE) by September. DO concentrations in the benthic zone were consistently lower than in the water column (paired t-test, P < 0.001). Benthic isolation indices were calculated to compare conditions between zones as an arithmetic ratio, absolute difference, and a normalized difference. Preliminary data suggest differences in habitat conditions between the two zones may be related to BOM abundance and physicochemical conditions.

  • C01 Algae
  • C06 Large River Ecology
  • C10 Biogeochemistry

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Presenters/Authors

Nicholas Banish (), University of Montana, nicholas.banish@umontana.edu;


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Marc Peipoch (), Stroud Water Research Center, mpeipoch@stroudcenter.org;


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H. Maurice Valett (), University of Montana, Division of Biological Sciences, maury.valett@umontana.edu;


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