||Effects of Natural Sediment Features on Survival of the 'Phoxocephalid amphipod', 'Rhepoxynius abronius'.
DeWitt, T. H. ;
Ditsworth, G. R. ;
Swartz, R. C. ;
||Environmental Research Lab.-Narragansett, Newport, OR. Mark O. Hatfield Marine Science Center. ;Oregon State Univ., Newport. Hatfield Marine Science Center.
Water pollution effects(Animals) ;
Marine biology ;
Field tests ;
Puget sound ;
Particle size ;
Environmental monitoring ;
Chemical water pollutants ;
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Effects of sediment particle size and water content on the survival of the amphipod. Rhepoxynius abronius, were examined by manipulating these natural sediment features within static laboratory microcosms. Mean amphipod survival in fine, uncontaminated, field sediments (> or = to 80% silt-clay) can be 15% lower than survival in native sediment. Storage of sediments at 4 C over 7-14 days did not change sediment toxicity, but handling (i.e. elutriation and recombination) of muddy sediments increased toxicity. Sediment particle size and organic content had greater impact on the survival of R. abronius than did sediment water content in modifying amphipod survival, but one can not independently separate the effects of these two sediment variables. A new set of criteria is proposed to interpret toxicity results from the amphipod bioassay in the light of the mortality associated with fine sediment particle size.