2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/23/2019 | 2:30 PM - 2:45 PM | EFFECTS OF LOW-LEVEL INCREASES IN CONCENTRATION OF TWO COMMON SODIUM SALTS ON LEAF LITTER DETRITUS AND ASSOCIATED AQUATIC MICROBIAL COMMUNITIES | 151 ABC

EFFECTS OF LOW-LEVEL INCREASES IN CONCENTRATION OF TWO COMMON SODIUM SALTS ON LEAF LITTER DETRITUS AND ASSOCIATED AQUATIC MICROBIAL COMMUNITIES

Freshwater salinization is a global issue due to anthropogenic activities. Sub-lethal salinization effects on freshwater microbes remain understudied, especially regarding specific salt anions. We investigated effects of two common sodium salts (NaCl, NaHCO3) across a sub-lethal concentration gradient (16, 32, 64mg/L Na) relative to unamended streamwater (3mg/L Na) on detrital-associated microbes. One-way ANOVA revealed no statistical differences across treatments for mean microbial biomass (algal, fungal, or bacterial) or % litter mass remaining, but response patterns may be important. NaHCO3 subsidized algal productivity and increased variance through 64mg/L, subsidized fungal productivity up to 32mg/L with steady variance overall, and decreased bacterial productivity and variance. NaCl suppressed algal productivity while increasing variance, subsidized fungal productivity and increased variance up to 32 mg/L, and decreased bacterial productivity and variance. Remaining % litter mass and variance remained stable regardless of treatment. Kruskal-Wallis analysis showed significant decreases in median microbial respiration with increasing NaHCO3 and NaCl; only 32-64mg/L NaCl treatments were lower than streamwater. NaHCO3 increased variation through 32mg/L and NaCl decreased variation for respiration. Results suggest small, sub-lethal salt increases may affect aquatic microbial communities, which could alter carbon flux, and ion identity matters.

Mesocosm
Microbial
Decomposition

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Presenters/Authors

Brooke Howard-Parker (), University of Arkansas, bbhowardparker@gmail.com;