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The influences of various anthropogenic sources of deterioration on meiobenthos (Ostracoda) over the last 100 years in Suo-Nada in the Seto Inland Sea, southwest Japan |
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| Authors: | Irizuki Toshiaki Takimoto Ayako Sako Megumi Nomura Ritsuo Kakuno Kouji Wanishi Akihito Kawano Shigenori |
| Affiliation: | a Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan b Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan c Faculty of Education, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan d Division of Environmental Science, Yamaguchi Prefectural Institute of Public Health and Environment, 535 Asada, Yamaguchi 753-0871, Japan e Inland Sea Research Division, Yamaguchi Prefectural Fisheries Research Center, 437-77 Aio-Hutashima-Nagahama, Yamaguchi 754-0893, Japan f The Shimane Nature Museum of Mt. Sanbe, 1121-8 Tane, Sanbe-cho, Oda 694-0003, Japan |
| Abstract: | This study focuses on the relationships of water and sediment quality with meiobenthos (Ostracoda) over the past 100 years, using a sediment core obtained from Suo-Nada in the Seto Inland Sea, Japan. We compared high-resolution ostracode results with geochemical and sedimentological data obtained from the study core as well as with rich environmental monitoring data that are available. R-mode cluster analysis revealed two bioassociations (BC, KA). Until the1960s, assemblages continued to show high diversity. They changed in approximately 1970, when excessive nutrients and organic matter began to be supplied, and most species decreased in number. All species of bioassociation BC were dominant again by the mid-1990s; however, those of bioassociation KA containing infaunal species did not increase and have been absent or rare since the 1970s because organic pollution of sediments has continued to date. This study provided robust baseline for ostracode-based long-term environmental monitoring in East Asia. |
| Keywords: | Ostracoda COD The Seto Inland Sea Suo-Nada Meiobenthos Organic pollution |
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