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EFFECTS OF LOW DISSOLVED OXYGEN ON SURVIVAL 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 AND REPRODUCTION OF DAPHNIA, HYALELLA, AND GAMMARUS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/177 (NTIS PB92188846), 1992.
Description:
Daphnia magna, Daphnia pulex, Hyalella azteca, and Gammarus lacustris were exposed to low dissolved oxygen concentrations in the laboratory. Acute and chronic exposures were conducted to develop data for use in the EPA Water Quality Criteria document for dissolved oxygen. . magna had two 48-h LC5Os (50% mortality) of 0.6 and 0.7 mg/L, and an HAEC (highest adverse effect concentration) of 0.6 and a LNAEC(lowest no adverse effect concentration) of 0.9 mg/L O2 (based on reproduction). ulex had a 48-hr LC5O of 0.5, two 96-hr LC5Os of 0.4 and O.7, and an HAEC of 1.6 and an LNAEC of 2.1 mg/L O2 (based on reproduction). H. azteca had 96-hr and 30-day LC5Os of <0.3 mg/L and an HAEC of 1.2 and a LNAEC of >1.2 (based on reproduction). . lacustris had two 7 day LC50s of <0.2 mg/L, and an HAEC of <0.2 and a LNAEC of 0.1 mg/L O2 (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 indicated that dissolved oxygen concentrations adequate to avoid impairment of fish production, as outlined in the U. S. EPA Water Quality Criteria document, should provide reasonable protection for these four species.