Chronic Sublethal Effects of San Francisco Bay Sediments on Nereis (Neanthes) arenaceodentata; Effect of Storage Time on Sediment Toxicity.

摘要

This report was designed to address concerns regarding the effect of sediment storage time on toxicity. To this end, seven San Francisco Bay area sediments and a 'clean' control sediment were evaluated in chronic sublethal tests with the marine polychaete worm Nereis (Neanthes) arenaceodentata. Juvenile worms (2 to 3 weeks postemergence) were exposed for 21 days. Test end points were survival and growth. Sediment toxicity was evaluated initially (within 30 days of collection) and at different points over time up to 2 years after collection. All San Francisco Bay area sediments were composites of several cores taken to project depth (38 ft (11.6 m) below mean low water mark) from a specific area. Reference sediments were collected from three potential in-bay disposal areas: on the mound at the Alcatraz disposal site, surrounding areas adjacent to the mound, the Bay Farm Borrow Pit in South Bay, and from an area outside the bay, Point Reyes (PRR). Project sediments were collected from three areas in Oakland Harbor: Oakland Inner Harbor (OI); Oakland Outer Harbor (OO) and from areas of OI known to be contaminated with metals and polyaromatic hydrocarbons, Oakland Contaminated (OC). The control sediment is used in our laboratory cultures of N. arenaceodentata and was collected from Sequim, WA. Chronic, Neanthes, Sublethal, Growth, Sediment.