title: Anthropogenic impacts on meiobenthic Ostracoda (Crustacea) in the moderately polluted Kasado Bay, Seto Inland Sea, Japan, over the past 70 years.
abstract: Two sediment cores were obtained from Kasado Bay, a moderate-polluted enclosed bay in Japan, to examine anthropogenic impacts on Ostracoda over the past ca. 70 years. We analyzed ostracode abundance and diversity, grain size, and CHN, and used (210)Pb and (137)Cs as the dating method. The present study showed that cross-plot comparisons of ostracode abundance and each environmental factor, based on sediment core data, could be used to identify ostracode species as indicators for anthropogenic influences. Ostracode abundance reflected mainly the changes that had occurred in total organic carbon content in sediments related to eutrophication, but heavy metal concentration did not directly influence several ostracode abundance in the bay. Environmental deterioration because of eutrophication started in the 1960s. The regulations regarding the chemical oxygen demand in waters introduced in the 1980s probably influence ostracode abundance for certain species in this period. Currently, Kasado Bay is not experiencing severe degradation.
authors.affiliation: Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan. Electronic address: irizuki@riko.shimane-u.ac.jp.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Irizuki
authors.affiliation: Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
authors.forename: Hisayo
authors.initials: H
authors.lastname: Ito
authors.affiliation: Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
authors.forename: Megumi
authors.initials: M
authors.lastname: Sako
authors.affiliation: Department of Geoscience, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Yoshioka
authors.affiliation: Tochigi Prefectural Museum, 2-2 Mutsumi-cho, Utsunomiya 320-0865, Japan.
authors.forename: Shigenori
authors.initials: S
authors.lastname: Kawano
authors.affiliation: Faculty of Education, Shimane University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan.
authors.forename: Ritsuo
authors.initials: R
authors.lastname: Nomura
authors.affiliation: National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8567, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Tanaka
mesh_terms: D000818:Animals; D061006:Bays; D057919:Biological Oxygen Demand Analysis; D002588:Cesium Radioisotopes / Q000032:analysis; D003445:Crustacea / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D004785:Environmental Pollutants / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry*; D007564:Japan; D007856:Lead Radioisotopes / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D010316:Particle Size; D011157:Population Dynamics
chemical_list: D002588:Cesium Radioisotopes; D004785:Environmental Pollutants; D007856:Lead Radioisotopes; D019216:Metals, Heavy
keywords: Eutrophication; Heavy metal pollution; Kasado Bay; Ostracoda; Seto Inland Sea; Total organic carbon