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A comparison of foraminiferal faunal trends in pristine and impacted regions on the continental shelf and slope of the Southern California Bight, as well as variations in the temporal foraminiferal distribution patterns from 1955 to 1998, suggest that the benthic microfaunal communities have been greatly affected by the presence of contaminated sediment near the major outfall sites. Six species were most impacted: Trochammina pacifica, Bulimina denudata, Eggerella advena, Buliminella elegantissima, Nonionella stella, and Nonionella basispinata. The silver contaminant-tolerant and organic-waste indicating species Trochammina pacifica and Bulimina denudata dominated the outfall regions in the mid-century but declined in abundance in the...

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