Info

Adapted from Gardinali and Wade (1998).

pg/g SEIs calculated as the sum of measured concentrations of 4 PCDD/Fs, 5 PCBs, and 7 PAHs times their respective induction equivalency factor (as compared to 2,3,7,8-TCDD).

Adapted from Gardinali and Wade (1998).

pg/g SEIs calculated as the sum of measured concentrations of 4 PCDD/Fs, 5 PCBs, and 7 PAHs times their respective induction equivalency factor (as compared to 2,3,7,8-TCDD).

sediment contaminant levels, B-IBI indices, and Ampelisca toxicity test results, Newark Bay and the Upper New York Harbor showed the most impairment, with Jamaica Bay ranking third. Despite differences in the extent and magnitude of sediment toxicity reported by Long et al. (1995) and Adams et al. (1998), both studies concluded that a significant percentage of the area in the Harbor Estuary has the potential to cause adverse impacts on aquatic invertebrates.

Few studies have assessed the effects of organic contaminants in the Hudson/Raritan Estuary on physiology or reproduction in invertebrates. Rice etal. (1995) conducted three different invertebrate toxicity tests on sediments from seventeen de-positional areas in the Hudson/Raritan Estuary. They compared a ten-day acute toxicity test to chronic tests examining mortality and growth in three Pacific Coast invertebrate species. Polychaete growth was the most sensitive parameter, with sediments from 65 percent of sites causing significant reductions, whereas amphipod mortality was the least sensitive measure. These results indicated that there is widespread potential for physiologic affects from contaminated sediments on invertebrate populations from throughout the HR Estuary.

McElroy, Elskus, and Fay (2000) used selective techniques to isolate different classes of organic contaminants and then conducted toxicity tests using these fractions to determine which contributed most to the toxicity in New York Harbor sediments. Easily desorbable organic contaminants were isolated as extracts from sediments, which were then partitioned into fractions enriched in alkanes and aliphatic material, PCBs, PAHs, and polar organics and amended separately to a reference sediment. Only the sediments amended with the PAH fraction were toxic, which corroborates earlier conclusions that organic contaminants such as PAHs are responsible for toxicity observed in sediments from around much of the HR Estuary.

0 0

Post a comment