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EFFECTS OF LOW DISSOLVED OXYGEN ON SURVIVAL, GROWTH AND REPRODUCTION OF DAPHNIA, HYALELLA, AND GAMMARUS
Citation:
Nebeker, A., S. Onjukka, D. Stevens, G. Chapman, AND S. Dominguez. EFFECTS OF LOW DISSOLVED OXYGEN ON SURVIVAL, GROWTH AND REPRODUCTION OF DAPHNIA, HYALELLA, AND GAMMARUS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/457 (NTIS PB94112968).
Description:
Daphnia magna, Daphnia pulex, Hyalella azteca, and Gammarus lacustris were exposed to low dissolved oxygen concentrations in the laboratory. cute and chronic exposures were conducted to develop data for use in the U.S. Environmental Protection Agency's (EPA's) water quality criteria document for dissolved oxygen. aphnia magna had two 48-h LC50S (5007o mortality) of 0.6 and 0.7 mg/L, a highest-adverse-effect concentration of 0.6, and a lowest-no-adverse-effect concentration of 0.9 mg/L 02 (based on reproduction). aphnia pulex had a 48-h LC50 of 0.5, two 96-h LC50s of 0.4 and 0.7, a highest-adverse-effect concentration of 1.6, and a lowest-no-adverse-effect concentration of 2.1 mg/L 02 (based on reproduction). yalella azteca had %-h and 30-d LC50s of <0.3 mg/L, a highest-adverse-effect concentration of 1.2, and a lowest-no-adverse-effect concentration of > 1.2 (based on reproduction). ammarus lacustris had two 7-d LC50s of <0.2 mg/L, a highest-adverse-effect concentration of <0.2, and a lowest-no-adverse-effect concentration of 0.1 mg/L 02 (based on survival). ack of access to the water surface increased mortality. itrogen-stripped and vacuum-degassed test water produced the same mortality. esults of this study indicate that dissolved oxygen concentrations adequate to avoid impairment of fish production, as outlined in the EPA's water quality criteria document, should provide reasonable protection for these four species.