| Figure
4.16. |
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Sediment bioassay results for 1997. Sediments
were not toxic (see text for definition) to either
amphipods or bivalve larvae at Davis Point (BD41),
Red Rock (BC60), Horseshoe Bay (BC21), and San Bruno
Shoal (BB15). Amphipod toxicity was observed in
both sampling periods at Napa River (BD50), Yerba
Buena Island (BC11), Alameda (BB70), Redwood Creek
(BA41), South Bay (BA21), and San Jose (C-3-0),
and only in the wet-sampling period (February) at
Grizzly Bay (BF21) and Coyote Creek (BA10). Sediments
at the River stations (BG20, BG30) were not toxic
to amphipods. Sediment elutriates were toxic to
larval mussels during both sampling periods at Sacramento
River (BG20), San Joaquin River (BG30), Grizzly
Bay (BF21), Napa River (BD50), and Coyote Creek
(BA10), but were not toxic to the larvae at the
remaining stations. Sediment conditions that could
have influenced toxicity are considered in the Discussion.
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