Benthic invertebrates and sediment characteristics in and adjacent to a proposed channel widening area (river mile 31-34), Columbia River estuary

In 1996 and 1997, the National Marine Fisheries Service (NMFS) studied the benthic invertebrates and sediments in subtidal areas between River Mile 31 and 34 (River Kilometer 50 and 55) in the Columbia River estuary in cooperation with the Portland District of the U.S. Army Corps of Engineers (COE). The COE is considering widening the navigation channel in this reach of the estuary by up to 91 m (300 ft). The proposed widening project could impact an area 183 m (600 ft) wide by over 4 km (2.5 mi) long. Benthic invertebrates, particularly the amphipod Corophium salmonis, found in intertidal and subtidal habitats of the Columbia River estuary are seasonally important in the diets ofjuvenile salmonids. The goal of the study was to collect baseline benthic invertebrate and sediment data in and adjacent to the proposed channel widening area prior to any habitat modification. Contract no. E96970007

1996年至1997年间，美国国家海洋渔业局（National Marine Fisheries Service, NMFS）联合美国陆军工程兵团（U.S. Army Corps of Engineers, COE）波特兰分区，对哥伦比亚河河口英里河长标记31至34（对应公里河长标记50至55）之间的潮下带区域的底栖无脊椎动物与沉积物展开了研究。
美国陆军工程兵团目前正考虑将该河口河段的通航航道拓宽至多91米（300英尺）。此次拟议的航道拓宽工程，可能会影响一片宽183米（600英尺）、长逾4公里（2.5英里）的区域。
栖息于哥伦比亚河河口潮间带与潮下带生境的底栖无脊椎动物，尤其是端足类动物鲑形钩虾（Corophium salmonis），在鲑科幼鱼的季节性食谱中占据重要地位。
本项研究的目标是在开展任何生境改造作业前，收集拟议航道拓宽区域及其毗邻区域的底栖无脊椎动物与沉积物本底数据。
合同编号：E96970007