気仙沼湾および周辺地域における表層堆積物中の珪藻遺骸群集

概要

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The surface deposits at 27 sites in Kesennuma Bay, North Japan, and at 6 sites in the surrounding rivers were taken on July and September in 2010, and February in 2011. The distributions of diatom assemblages from those sediments presumed the ecological environment and sedimentary processes at the study area. There was a distinct difference in the distributions of marine plankton species, such as Thalassiosira spp. and marine benthic-epiphytic species, such as Cocconeis scutellum. The marine plankton species Thalassiosira spp. dominated at eastern mouth of the bay, while the marine benthic-epiphytic species such as Cocconeis scutellum dominated at western mouth of the bay where shallow tidal flat with abundant sea algae spread widely. The freshwater diatom valves flew into the bay by river flooding and mainly deposited at the river mouths. The distribution of diatom assemblages from the surface sediments was very important data to presume the erosion, transportation and sedimentary processes by the huge tsunami on March 11, 2011.
日本古生物学会の論文
2013-03-31