2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 12:15 PM - 12:30 PM | SUB-LETHAL SALT CONCENTRATIONS ALTER DETRITIVORE PERFORMANCE | 410 B
SUB-LETHAL SALT CONCENTRATIONS ALTER DETRITIVORE PERFORMANCE
Mounting evidence supports that salts can alter detrital quality and riparian-stream linkages in agricultural, urban, and resource-extracted watersheds. Detritivore-specific responses to sub-lethal salt concentrations need to be quantified to understand ecosystem impacts. We quantified how sub-lethal ion concentrations affect detritivores with two experiments. First, sweetgum leaves were incubated in one of three sodium chloride (NaCl) and three sodium bicarbonate (NaHCO3) treatments (10 replicates per treatment): natural (from a local stream), low (16 mg/L Na), medium (32mg/L Na), and high (64 mg/L Na). In the first experiment, microbial respiration, leaf mass remaining, and fungal and algal biomasses were measured after 126 incubation days. In the second experiment, macro-detritivore growth and growth efficiencies were measured after 30 days. Overall, salt treatments had little effect on microbial-mediated decomposition and fungal and algal biomass; however, microbial respiration tended to be elevated in NaHCO3. In the second experiment, salt amendments tended to stimulate stonefly growth, but had varied effects on growth efficiencies compared to stream water. Ion-specific effects at multiple trophic levels may be from reduced energy expenditure for osmoregulation and altered detrital quality that together could have long-term effects on carbon cycling.
- Salinity
- Mesocosm
- Anthropogenic
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Presenters/Authors
Sally Entrekin
(), Virginia Tech, sallye@vt.edu;
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Brooke Howard-Parker
(), University of Arkansas, bbhowardparker@gmail.com;
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Natalie Clay
(), Louisiana Tech University, nclay@latech.edu;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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