Distributions of modern benthic foraminiferal assemblages in Ise and Mikawa bays, central Japan

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  • Yokoi Daisaku
    Aichi prefectural high school of Atsuta
  • Abe Osamu
    Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University
  • Iryu Yasufumi
    Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University

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Other Title
  • 伊勢湾・三河湾における現生底生有孔虫群集の分布
  • イセワン ミカワワン ニ オケル ゲンセイ テイセイユウコウチュウ グンシュウ ノ ブンプ

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Abstract

The distributions of modern benthic foraminiferal assemblages were investigated in Ise and Mikawa bays, Japan, using surface sediments collected in September 2007. Forty seven species belonging to 40 genera were identified from Ise and Mikawa bays. Agglutinated species were dominant in the inner part of Ise and Mikawa bays, while calcareous species were dominant in the central part of Ise Bay. Significant shifts of assemblages were found in comparison with the distribution from surface sediments collected in 1940 from Ise Bay; calcareous species were replaced with agglutinated species in the inner part and the composition of calcareous species had changed completely in the central part. These results suggest that the present bottom environments are more eutrophic and anoxic than they were 67 years ago. Indicator species also suggested that Ise Bay is presently more eutrophic and anoxic than Mikawa Bay. A comparative study of distributions in Tokyo and Osaka bays demonstrated several similarities, while regional characteristic also were found there.

Journal

  • Fossils

    Fossils 89 (0), 15-26, 2011

    Palaeontological Society of Japan

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