Retori Hiraoka, Tetsu Ichikawa, K. Imao, Tomoki Miyamukai, T. Takabe, Yoshito Tanaka, Teruaki Suzuki
{"title":"Calculation of Decay and Shedding Rates of Environmental DNA in Portunus pelagicus (Linnaeus, 1758) by Rearing Experiments","authors":"Retori Hiraoka, Tetsu Ichikawa, K. Imao, Tomoki Miyamukai, T. Takabe, Yoshito Tanaka, Teruaki Suzuki","doi":"10.2965/jswe.45.223","DOIUrl":"https://doi.org/10.2965/jswe.45.223","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76251983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Toshiaki Saito, Taishi Akagi, Daichi Fujii, S. Konuma, Y. Yoshida
{"title":"Evaluation of Direct Effect of Nitric Oxide on Nitrous Oxide Production by Ammonia-oxidizing Organisms","authors":"Toshiaki Saito, Taishi Akagi, Daichi Fujii, S. Konuma, Y. Yoshida","doi":"10.2965/jswe.45.107","DOIUrl":"https://doi.org/10.2965/jswe.45.107","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78680214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of Fecal Contamination in Lake Biwa and Yodogawa River Basin by Monitoring Genetic and Chemical Markers","authors":"Hiroyuki Takino, T. Miura, K. Kosaka, M. Akiba","doi":"10.2965/jswe.45.193","DOIUrl":"https://doi.org/10.2965/jswe.45.193","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76089098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the application of the polar organic chemical integrative sampler (POCIS) for the time-weighted average concentration (TWAC) of paddy-use pesticides in environmental water was evaluated. Two herbicides and one fungicide were selected and investigated by deploying POCIS and high-frequency grab sampling (more than two times per day) in three paddy drainage canals (2.8–70 ha) and one river in the Lake Biwa basin for 7–21 day periods. TWACs determined by POCIS and by high-frequency grab samples showed good agreement, and 11 of 14 datasets (79% of all datasets) were within the range of 0.5–2.0-fold difference. To generate estimates of TWAC at different sampling intervals, the high-frequency grab sampling data were subsampled at intervals of 1, 2, 3, 4, and 7days. On the basis of the comparison of TWACs between POCIS and different grab sampling intervals, it is considered that the sampling interval that yields equivalent TWACs to those of POCIS was more than once a week in datasets with low CVs of pesticide concentration (CV ≦ 100%),but more than three day intervals in databases with high CVs.
{"title":"Comparison between Polar Organic Chemical Integrative Sampler (POCIS) and Grab Samples to Estimate Time-Weighted Average Concentrations of Paddy-Use Pesticide Residue in Stream Water","authors":"M. Sudo, Masato Kajihara, K. Iwama","doi":"10.2965/jswe.45.41","DOIUrl":"https://doi.org/10.2965/jswe.45.41","url":null,"abstract":"In this study, the application of the polar organic chemical integrative sampler (POCIS) for the time-weighted average concentration (TWAC) of paddy-use pesticides in environmental water was evaluated. Two herbicides and one fungicide were selected and investigated by deploying POCIS and high-frequency grab sampling (more than two times per day) in three paddy drainage canals (2.8–70 ha) and one river in the Lake Biwa basin for 7–21 day periods. TWACs determined by POCIS and by high-frequency grab samples showed good agreement, and 11 of 14 datasets (79% of all datasets) were within the range of 0.5–2.0-fold difference. To generate estimates of TWAC at different sampling intervals, the high-frequency grab sampling data were subsampled at intervals of 1, 2, 3, 4, and 7days. On the basis of the comparison of TWACs between POCIS and different grab sampling intervals, it is considered that the sampling interval that yields equivalent TWACs to those of POCIS was more than once a week in datasets with low CVs of pesticide concentration (CV ≦ 100%),but more than three day intervals in databases with high CVs.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86869092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Iwasaki, Yuta Kobayashi, Tomomi Suemori, Kazutaka M. Takeshita, M. Ryo
{"title":"Compiling Physicochemical Characteristics of Water Quality Monitoring Sites (Environmental Reference Points) in Japanese Rivers and Site Grouping","authors":"Y. Iwasaki, Yuta Kobayashi, Tomomi Suemori, Kazutaka M. Takeshita, M. Ryo","doi":"10.2965/jswe.45.231","DOIUrl":"https://doi.org/10.2965/jswe.45.231","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85316663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An environmental standard on the number of coliforms in public rivers was set in 1970 to indicate fecal contamination, but its low indexability has been a problem. In this study, we investigated the usefulness of the hydrophobic gridded membrane filter (HGMF) method using CHROMagar-ECC nutrient agar and the Colilert method for the simultaneous enumeration of coliform bacteria and coliforms, in addition to the prescribed method based on notification No.94 in 2011 of the Ministry of the Environment that can only detect coliform bacteria. From the results of the survey in the Yamato River system, we found that the three methods showed a certain consistency of results, and that the HGMF and Colilert methods were capable of identifying the sites with high contamination levels which could not be determined from coliform counts alone. We also verified how the accuracy of a new environmental standard would change when the current environmental standard is revised from the coliform group count to the Escherichia coli count, and we found that many points on effectiveness that had not been realized with the current standard are expected to be realized after the standard after the revision.
{"title":"Comparison of Quantification Methods and Study on Escherichia coli and Coliforms in Yamato River","authors":"Katsushige Uranishi, Yosuke Uranishi, Mayumi Tsujimoto, Jirou Shiroyama","doi":"10.2965/jswe.45.29","DOIUrl":"https://doi.org/10.2965/jswe.45.29","url":null,"abstract":"An environmental standard on the number of coliforms in public rivers was set in 1970 to indicate fecal contamination, but its low indexability has been a problem. In this study, we investigated the usefulness of the hydrophobic gridded membrane filter (HGMF) method using CHROMagar-ECC nutrient agar and the Colilert method for the simultaneous enumeration of coliform bacteria and coliforms, in addition to the prescribed method based on notification No.94 in 2011 of the Ministry of the Environment that can only detect coliform bacteria. From the results of the survey in the Yamato River system, we found that the three methods showed a certain consistency of results, and that the HGMF and Colilert methods were capable of identifying the sites with high contamination levels which could not be determined from coliform counts alone. We also verified how the accuracy of a new environmental standard would change when the current environmental standard is revised from the coliform group count to the Escherichia coli count, and we found that many points on effectiveness that had not been realized with the current standard are expected to be realized after the standard after the revision.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83027266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Kamohara, Manami Yuguchi, Kiyo Kurita, Teruaki Suzuki
{"title":"Effect of Nutrient Supply from Basin Sewerage on the Presence of Clam, Ruditapes philippinarum, at the Mouth of Toyogawa River in Mikawa Bay","authors":"S. Kamohara, Manami Yuguchi, Kiyo Kurita, Teruaki Suzuki","doi":"10.2965/jswe.45.181","DOIUrl":"https://doi.org/10.2965/jswe.45.181","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85698338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Kumagai, Hiroki Iyooka, Shusaku Hirakawa, Yuko Ishibashi, Ryoichi Watanabe
The landscape of a small pond in Fukuoka prefecture has been ruined by floating algae. Basic information, such as the type of algae, location of occurrence, and the amount of generated floating algae, was required to take action. In this study, we identified the floating algae by polarizing microscope observation and microbial community analysis. Additionally, we conducted aerial investigations using a multicopter equipped with a visual and near-infrared camera, and we quantified floating algae areas using images obtained from aerial observation. The results revealed that the floating algae were primarily made up of filamentous cyanobacteria from the family Pseudanabaenaceae. They mainly grow in the shallow area of the pond and peel off from the shallow bottom of the pond because of proliferation-related bubbles in summer. In addition, there was a relationship between the increase and decrease in algae carbon calculated using water temperature and solar radiation and the fluctuation in aerially observed algae area, suggesting that measures to limit solar radiation may be effective as a means of controlling algae proliferation.
{"title":"Quantification of Floating Algae in a Small Reservoir Using a Multicopter","authors":"H. Kumagai, Hiroki Iyooka, Shusaku Hirakawa, Yuko Ishibashi, Ryoichi Watanabe","doi":"10.2965/jswe.45.75","DOIUrl":"https://doi.org/10.2965/jswe.45.75","url":null,"abstract":"The landscape of a small pond in Fukuoka prefecture has been ruined by floating algae. Basic information, such as the type of algae, location of occurrence, and the amount of generated floating algae, was required to take action. In this study, we identified the floating algae by polarizing microscope observation and microbial community analysis. Additionally, we conducted aerial investigations using a multicopter equipped with a visual and near-infrared camera, and we quantified floating algae areas using images obtained from aerial observation. The results revealed that the floating algae were primarily made up of filamentous cyanobacteria from the family Pseudanabaenaceae. They mainly grow in the shallow area of the pond and peel off from the shallow bottom of the pond because of proliferation-related bubbles in summer. In addition, there was a relationship between the increase and decrease in algae carbon calculated using water temperature and solar radiation and the fluctuation in aerially observed algae area, suggesting that measures to limit solar radiation may be effective as a means of controlling algae proliferation.","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87346580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kenichiro Deguchi, Kazutaka Horie, Saeko Kikuchi, Yasuhiko Nagasaka, N. Kamiko
{"title":"Development of Method of Calculating UV Dose Distributions Using Dye Microcapsules and Applying Lognormal Distributions to Their UV-Sensitive Properties","authors":"Kenichiro Deguchi, Kazutaka Horie, Saeko Kikuchi, Yasuhiko Nagasaka, N. Kamiko","doi":"10.2965/jswe.45.125","DOIUrl":"https://doi.org/10.2965/jswe.45.125","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79294702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Terada, T. Hori, K. Kubota, F. Kurisu, I. Kasuga, T. Kindaichi, Tsukasa Ito
{"title":"Recent Progress in Cutting-edge Monitoring Tools for Microbiomes in Engineered Systems","authors":"A. Terada, T. Hori, K. Kubota, F. Kurisu, I. Kasuga, T. Kindaichi, Tsukasa Ito","doi":"10.2965/jswe.45.91","DOIUrl":"https://doi.org/10.2965/jswe.45.91","url":null,"abstract":"","PeriodicalId":16300,"journal":{"name":"Journal of Japan Society on Water Environment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84162327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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