Ecological shifts due to anthropogenic activities in the coastal seas of the Seto Inland Sea, Japan, since the 20th century

Toshiaki Irizuki, Kotaro Hirose, Yukari Ueda, Yuki Fujihara, Hiroaki Ishiga, Koji Seto

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    Multiproxy analyses were conducted using sediment cores in a low-polluted coastal site (Hiuchi-nada) in the Seto Inland Sea (SIS), Japan. Heavy metal and organic pollution peaked in the 1960s and the bottom environments have ameliorated since the 1980s due to several environmental regulations. First ecological shifts in meiobenthic ostracodes and diatoms occurred in the 1960s due to the initiation of eutrophication. Then, a second ecological shift occurred in the 1980s due to the amelioration of the water and the bottom quality. A compilation of similar analytical results in the coastal seas of the SIS reveals three types of ecological and environmental history since the 20th century. The environmental improvement since the 1980s affects the ecosystems, in particular, in a low-polluted bay. However, ecological compositions are different from those prior to the 1960s, suggesting that the ecosystem was not recovered but changed into the next stage in the SIS.

    Original languageEnglish
    Pages (from-to)637-653
    Number of pages17
    JournalMarine Pollution Bulletin
    Volume127
    DOIs
    Publication statusPublished - 2018 Feb 1

    Keywords

    • Diatom
    • Ecosystem
    • Heavy metal pollution
    • Organic pollution
    • Ostracoda
    • Seto Inland Sea

    ASJC Scopus subject areas

    • Oceanography
    • Aquatic Science
    • Pollution

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