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- W2022265004 abstract "Ecological effects of weathered and unweathered Louisiana crude oil spilled in eastern coastal plain estuaries were evaluated at all trophic levels and the major chemical components of the oil were followed through selected components of the ecosystem for 36 months.The study site consisted of a natural estuarine marshcreek habitat off the York River, Virginia, modified by the construction of retaining walls to form aquatic and marsh areas in each experimental unit. Each system was closed on all sides with the exception of an opening below the level of lowest tide to allow communication with tidal flow. Five experimental units were constructed, each having a surface area of about 810 m2, containing 695 m2 of marsh, 100 m2 of open water and 15 m2 of intertidal mud flat. The most upstream unit served as the control and the four downstream units received dosages of fresh and weathered crude oil. In addition, biological sampling in the open marsh and creek areas was conducted to provide an estimate of the effects of containing the marsh.Five hundred and seventy liters of fresh South Louisiana crude were added to each of the two downstream experimental enclosures approximately three hours into flood tide and were completed in 1 h. The weathered oil was similarly applied to the upstream units 3 days later.The weathered oil was not visible one week after the spill except as coatings on marsh grass blades, while the fresh crude remained for over three weeks. Plankton populations recovered within a week, and fish mortalities, which were most pronounced in the weathered oil unit, ceased after 10 days.Reductions in standing crops of marsh grasses were most pronounced the year following the spills, when peak biomass in the control exceeded the spill units by a factor of three. Recovery progressed further in the second year with peak biomass in the oiled units being about 70% of the control. The third year following the spill, recovery was nearly complete.Benthic populations were dominated numerically by oligochaetes. Significant reductions in populations of this dominant organisms and in populations of polychaetes and amphipods were demonstrable for a period of three years although most of the populations have shown definite signs of recovery." @default.
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- W2022265004 date "1980-01-01" @default.
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- W2022265004 title "Ecological effects of experimental oil spills in Eastern coastal plain estuaries" @default.
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