2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/26/2021 | 8:30 AM - 10:30 AM | ANABAENA GROWTH AND ELEMENTAL STOICHIOMETRY RESPONSE TO SODIUM CHLORIDE SALINIFICATION IN A LABORATORY EXPERIMENT | Virtual Platform
ANABAENA GROWTH AND ELEMENTAL STOICHIOMETRY RESPONSE TO SODIUM CHLORIDE SALINIFICATION IN A LABORATORY EXPERIMENT
Secondary salinization increases the levels of sodium (Na) and chloride (Cl) in freshwater systems and these elements can be a nutritional subsidy or stress depending the concentration. Terrestrial autotrophs often have ion concentrations that positively correlate with their environment and we examined if aquatic autotrophs also demonstrate this relationship. We tested the hypothesis that algal elemental composition positively reflects environmental conditions by culturing Anabaena inequalis, a common algal species, in laboratory microcosms in COMBO media with increasing NaCl additions (ambient, 0.35, 1, 5, 10 g/L). Alga sampling occurred on even days and elemental composition was examined from algal dry mass sampled on days 17-19 from a composite sample. Chlorophyll-a content for all treatments followed a logistic growth curve that peaked on day 16 with an inverse relationship being observed for maximum chlorophyll-a concentration and NaCl addition. An ANOVA revealed carbon:nitrogen differed by treatment (p-value = 0.0002) with carbon:nitrogen decreasing from ambient to 0.35 g/L NaCl then increasing with higher treatments. Algal magnesium, Na, potassium, Cl and phosphorus data are pending. Salinization could change algal elemental composition that impacts primary basal food resource quality and transfer through aquatic food webs.
- Salinity
- Contaminants
- Anthropogenic
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Presenters/Authors
Samuel Dias
(), University of Arkansas, sadias@uark.edu;
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Sally Entrekin
(), Virginia Tech, sallye@vt.edu;
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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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