2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 12:00 PM - 12:15 PM | MICRO- AND MACRO-DETRITIVORE SUBSIDY-STRESS RESPONSES TO RISING COMMON SALTS: ARE DETRITAL ENDPOINTS NEEDED? | 301A

MICRO- AND MACRO-DETRITIVORE SUBSIDY-STRESS RESPONSES TO RISING COMMON SALTS: ARE DETRITAL ENDPOINTS NEEDED?

Ecosystem impacts of sub-lethal salt concentrations are prevalent but understudied. Despite the widespread low-level increases associated with human activities, few have studied the ecological consequences. We predict micro-and macro-detritivores to follow a subsidy-stress response because salt becomes toxic to detritivores above ca. 3-om greater than ambient, but low-levels may relax osmoregulatory stress. We measured microbial respiration and macro-detritivore stonefly growth following one-month incubations in stream water vs. three NaCl- and NaHCO3-amended stream water (3-64 mgL-1) below toxicity. Microbial respiration did not differ from stream water across the NaHCO3 gradient, but it was less than stream water at low and medium NaCl concentrations. Stoneflies grew 12% more in stream water amended with 64 mgL-1 NaCl than when grown in stream water, but growth did not differ for stoneflies grown in 64mg L-1 NaHCO3. However, in other experiments, aquatic isopods suffered mass loss at 140 mg L-1 NaCl, but NaCl had no effect on Tipula larvae. Together, results suggest salt form, concentration, and detritivore identity matters, and that small salt increases can stimulate or impact detritivore growth and performance to influence decomposition.

C13 Ecotoxicology
C31 Organic Matter Processing
S14 Stressors in linked aquatic-terrestrial ecosystems: New developments and solutions

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Presenters/Authors

Sally Entrekin (), Virginia Tech, sallye@vt.edu;