STP802

    Differential Sensitivity of New Versus Mature Synthetic Microcosms to Streptomycin Sulfate Treatment

    Published: Jan 1983


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    Abstract

    Small, 3-L batch microcosms with synthetic medium and sediment, eight algal species, Daphnia magna, Hyallela, Cyprinotus, rotifers, and protozoa were used to determine whether newly established systems were more sensitive to weekly perturbations of 10 mg/L streptomycin sulfate additions than aged (nutrient-depleted) microcosms. Changes in population densities and pH were contrasted for the microcosms treated after 77 days of maturation and those treated immediately after assembly. Competitive dominance reversals of the algae Ankistrodesmus and Scenedesmus were observed with treatment in the new, but not the aged, microcosms. For all but one diatom species, greater differences were observed with treatment in the younger microcosms. Independent t-tests of the new and aged microcosms revealed a greater number of significant changes in the new microcosms during the 35-day period following initiation of treatment.

    Keywords:

    freshwater biology, streptomycin, nutrients, algal bloom, aquatic toxicology, hazard assessment


    Author Information:

    Kindig, AC
    Postdoctoral fisheries biologist, assistant professor, and professor, School of Fisheries, College of Ocean and Fishery Sciences, University of Washington, Seattle, WA

    Conquest, LL
    Postdoctoral fisheries biologist, assistant professor, and professor, School of Fisheries, College of Ocean and Fishery Sciences, University of Washington, Seattle, WA

    Taub, FB
    Postdoctoral fisheries biologist, assistant professor, and professor, School of Fisheries, College of Ocean and Fishery Sciences, University of Washington, Seattle, WA


    Paper ID: STP33507S

    Committee/Subcommittee: E47.01

    DOI: 10.1520/STP33507S


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