Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
Department of Earth Sciences, Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
Mar Pollut Bull. 2018 Feb;127:637-653. doi: 10.1016/j.marpolbul.2017.12.050. Epub 2017 Dec 29.
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.
多指标分析使用了日本濑户内海（SIS）低污染沿海地区（日向滩）的沉积岩芯。重金属和有机污染在 20 世纪 60 年代达到峰值，自 20 世纪 80 年代以来，由于几项环境法规的实施，底部环境得到了改善。有孔虫介形类和硅藻的首次生态变化发生在 20 世纪 60 年代，原因是富营养化的开始。然后，由于水质和底部质量的改善，在 20 世纪 80 年代发生了第二次生态变化。对 SIS 沿海海域类似分析结果的汇编揭示了自 20 世纪以来的三种生态和环境历史类型。自 20 世纪 80 年代以来的环境改善影响了生态系统，特别是在低污染的海湾。然而，生态组成与 20 世纪 60 年代以前不同，这表明该生态系统并未恢复，而是在 SIS 进入下一个阶段。
