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We monitored temporal variations of a bottom sediment quality and benthic species diversity based on sediment sampling and analysis around the Tama river mouth in the Tokyo Bay. The monitoring started in 2006 and we focused on the impact of the extensive flood event in September 2007 on the benthic environment. As a result, the diversity and biomass of the benthic species were increased after the flood especially in the off shore of the river mouth. The re-colonization of the benthic biota is considered to be related with the favorable change in the sedimentary environment for the species with disappearance of fluff layer on the bottom surface by the flood event.

Impacts of Flood Event on Sedimentary Environment and Benthic Biota Around the Tama River Mouth