Benthic invertebrates and sediments in vegetated and nonvegetated habitats at three intertidal areas of the Columbia River Estuary, 1992

The COE proposed five research objectives to study the variations in wetland development at the three islands. The objectives included: 1) determination of topographic elevations, 2) mapping of plant species, 3) comparisons of wetland elevations to fluctuating water levels caused by daily tidal and seasonal river-flow changes, 4) sediment analyses for vegetated and nonvegetated intertidal sites, and 5) descriptions of benthic invertebrate communities at vegetated and nonvegetated intertidal sites. In mid-1992, the National Marine Fisheries Service (NMFS) agreed to cooperate with the COE to complete Objectives 4 and 5 at Miller Sands, Jim Crow Sands, and a remnant intertidal marsh in Grays Bay, which is adjacent to Rice Island. Contract no. E9592012