2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 2:00 PM - 2:15 PM | EPILITHIC BIOMASS ABUNDANCE AND COMPOSITION: INFLUENCES ON ALLOCHTHONOUS AND AUTOCHTHONOUS NITROGEN SOURCES | 420 A
EPILITHIC BIOMASS ABUNDANCE AND COMPOSITION: INFLUENCES ON ALLOCHTHONOUS AND AUTOCHTHONOUS NITROGEN SOURCES
Excessive nutrient inputs can cause algal and cyanobacterial blooms in river systems. Elevated concentrations of phosphorus (P) and nitrogen (N) in the Upper Clark Fork River (UCFR) of MT promote extensive mid-summer blooms of green algae (i.e. Cladophora), with some evidence of late-summer cyanobacteria proliferation. In addition to nutrient loading, the UCFR suffers from major metal contamination. Algal form and abundance may play a critical role in metal movement through the food web. Research addressing N availability, the relative abundance of N-fixing cyanobacteria and Cladophora in the periphyton community, and their interactions was addressed to determine the implications of nutrient enrichment. Summer-long assessment of N- fixation rates revealed fluxes ranging from 0.7 to 45.4 ugNm-2h-1 while biofilm abundance varied by almost 80-fold (0.456 to 36.1 g AFDM/m2) over six weeks of sampling. Comparisons with nitrate uptake rates during changing periphyton composition were used to determine the role of allochthonous and autochthonous N sources on epilithic biomass abundance and composition.
- Bacteria
- Algae
- Biogeochemistry
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Presenters/Authors
Kim Bray
(), University of Montana, bray.k.kim@gmail.com;
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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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