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Main Title Temporal Changes in the Benthos along a Pollution Gradient: Discriminating the Effects of Natural Phenomena from Sewage-Industrial Wastewater Effects.
Author Ferraro, S. P. ; Swartz, R. C. ; Cole, F. A. ; Shults, D. W. ;
CORP Author Environmental Research Lab.-Narragansett, Newport, OR.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-93/084 ;ERLN-N143;
Stock Number PB93-173714
Additional Subjects Environmental impact assessments ; Benthos ; Water pollution effects ; Temporal distribution ; Environmental monitoring ; Sewage disposal ; Outfall sewers ; Waste water ; Industrial wastes ; Aquatic ecosystems ; Sediment transport ; Environmental transport ; Reprints ; Los Angeles County(California)
Library Call Number Additional Info Location Last
NTIS  PB93-173714 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 27p
As pollution from the Los Angeles County Sanitation Districts (LACSD) outfalls decreased between 1980 and 1983, the macrobenthic community partially recovered and surficial (0-2 cm deep) sediment contamination and toxicity decreased at 60 m water depth along a pollution gradient from the outfalls. Pollution from the LACSD outfalls continued to decrease but macrobenthic conditions and surficial sediment quality deteriorated 1 km, was unchanged 3 km, and improved 5-15 km from the LACSD outfalls between 1983 and 1986. The net effect of natural phenomena is indicated when ecosystem changes occur in the opposite direction from that expected under prevailing pollution conditions. The authors data suggest that the net effect of natural phenomena (e.g. winter storms, El Nino) on the benthos was greater than LACSD wastewater effects 1 km, about equal to LACSD wastewater effects 3 km, and less than the LACSD wastewater effects 5-15 km from the outfalls at the LACSD 1983-86 mass emission rate. Since natural phenomena may have an effect on the benthos = or > 3 years of LACSD wastewater effects, short-term benthic changes must be interpreted cautiously at the study site.