Article
Engineering, Civil
Bojun Liu, Yu Wang, Jun Xia, Jin Quan, Junzhi Wang
Summary: This paper discusses the optimal water resources operation model for rivers-connected lakes, using quantified uncertainty as the objective function, coupled with human factors to propose an adaptive optimal plan, and a comprehensive algorithm for solving the model.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Hantao Li, Tomomichi Kato, Masato Hayashi, Lan Wu
Summary: This study used multiple remote sensing datasets and a random forest regression model to estimate forest aboveground biomass (AGB) of Japanese cedar and Japanese cypress in Ibaraki Prefecture, Japan. The results showed that the model combining multiple datasets performed better and had a strong linear relationship with the government data.
Article
Biotechnology & Applied Microbiology
Takumi Motoya, Noriko Nagata, Ryo Kashimura, Keiko Ohashi, Aoi Saito, Shuichi Osawa, Keiko Goto, Sadaki Iwama, Toshikazu Yanaoka, Kaori Okayama, Shinichiro Hirai, Toshiyuki Sugai, Koichi Murakami, Taisei Ishioka, Akihide Ryo, Kazuhiko Katayama, Hirokazu Kimura
Summary: The study found low levels of enteric virus contamination in bivalves collected along the coast of Ibaraki Prefecture, with norovirus detected in natural oysters having genotypes closely related to those prevalent in humans. The research highlights the association between contamination of bivalves by enteric viruses and the prevalence of human diarrhea and illness.
JOURNAL OF FOOD PROTECTION
(2021)
Article
Ecology
Christine L. Weilhoefer, Shin-ichi Nakano, Souyma Deb, Keitaro Fukushima
Summary: The biomass and community structure of benthic microalgae in Japanese rivers are often limited by nutrient availability. Regardless of in-stream nutrient concentrations and land use, nutrient limitation of primary producer biomass and changes in community structure were observed in all four studied rivers. Nutrient additions resulted in shifts in algal community composition, particularly in forested catchments. These findings highlight the sensitivity of benthic algal communities to nutrient inputs and underscore the importance of considering both biomass and species composition when evaluating the impacts of elevated nutrient levels on river ecosystems.
Article
Environmental Sciences
Kazuhisa A. Chikita, Kazuhiro Amita, Hideo Oyagi, Jun Okada
Summary: This study investigates the long-term chemical fluxes controlling Lake Tazawa in Japan and explores the groundwater water cycle system between the lake and the volcano. The findings reveal significant changes in the water quality of the lake in 1940, leading to the extinction of a specific fish species and alterations in the residence time of the lake water.
Article
Geosciences, Multidisciplinary
Olivier Evrard, Caroline Chartin, J. Patrick Laceby, Yuichi Onda, Yoshifumi Wakiyama, Atsushi Nakao, Olivier Cerdan, Hugo Lepage, Hugo Jaegler, Rosalie Vandromme, Irene Lefevre, Philippe Bonte
Summary: A study compiled data on gamma-emitting artificial radionuclide activities measured in 782 sediment samples collected during 16 fieldwork campaigns in Japan from November 2011 to November 2020. This dataset may help in evaluating and anticipating the post-accidental redistribution of radionuclides in the environment and validating models simulating the transfer of radiocesium across continental landscapes.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Environmental Sciences
Ming Kong, Liqun Xing, Ruomeng Yan, Jun Li, Yimin Zhang, Aimin Li, Tao Zhang
Summary: This study investigated the variation of water quality parameters and antibiotics in rivers inflowing into Taihu Lake. The results showed that the concentration of pollutants varied between seasons, and antibiotics were detected in both surface waters and sediments. Antibiotics in surface waters were mainly related to temperature, dissolved oxygen, total nitrogen, and ammonia nitrogen, while antibiotics in sediments were mainly related to temperature, pH, and total nitrogen. The concentrations of antibiotics were higher in winter, and the ecological risk values of antibiotics were also higher in winter compared to other seasons.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Geography, Physical
Naoya Takahashi, J. Bruce H. Shyu, Chia -Yu Chen, Shinji Toda
Summary: Studying river responses to active tectonics can help infer rock uplift rates and spatial distribution. Rock erodibility plays a significant role in channel steepness variation. In this study, the authors inferred rock uplift rates based on river morphology across substrates with contrasting erodibility. They found that the effects of different rock types on channel steepness cannot be explained solely by erodibility.
Article
Engineering, Environmental
Yun Luo, Zengchuan Dong, Yuhuan Liu, Xinkui Wang, Qingyi Shi, Yalei Han
Summary: By analyzing and predicting the water level of lakes using the BFAST algorithm and NARX model, and introducing wavelet analysis and KNN algorithm for data preprocessing and result post-processing, the accuracy of lake water level prediction can be improved.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2021)
Article
Multidisciplinary Sciences
Ali Mobadersani, Ali Hosseinzadeh Dalir, Mehdi Yasi, Hadi Arvanaghi, Mark J. Kennard
Summary: This study introduces a new method to calculate the environmental water requirement of lakes based on real-time data from rivers, effectively protecting the lake ecosystem from drought, climate change, and other impacts.
SCIENTIFIC REPORTS
(2022)
Article
Fisheries
Makito Hayashi, Yoshihiko Sano, Takanori Ishikawa, Tomiji Hagiwara, Mizuki Sasaki, Minoru Nakao, Misako Urabe, Tsukasa Waki
Summary: This study investigated the invasion of bucephalid trematodes in the Tone River system in Japan, focusing on the golden mussel Limnoperna fortunei and several freshwater fish species. The newly introduced species Prosorhynchoides ozakii was found in both mussels and fishes, causing infections and potential impacts on the hosts. The genetic analysis suggests intentional and repeated introductions of the parasite into the river system.
DISEASES OF AQUATIC ORGANISMS
(2022)
Article
Environmental Sciences
Gaixiao Qin, Xiaohui Ai, Jin Xu, Yibin Yang
Summary: By analyzing the transcriptome data of channel catfish spleen infected with Aeromonas veronii, we successfully studied the transcript expression profile of pathogen-host interaction. The infected host enriched multiple immune-related signaling pathways and upregulated innate immune-related genes. Meanwhile, it was found that A. veronii mainly caused spleen damage through hemolysin. These findings are of great significance in clarifying the pathogenesis of channel catfish induced by A. veronii and provide gene targets for developing preventive measures.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Limnology
Toshimi Nakajima, Ryo Sugimoto, Takahiro Kusunoki, Katsuhide Yokoyama, Makoto Taniguchi
Summary: The study found that oceanic water is the main source of nutrients for coastal ecosystems along the Sanriku Bay, but land-derived nutrients can also accelerate coastal primary production during certain seasons.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Immunology
Yibin Yang, Xia Zhu, Haixin Zhang, Yuhua Chen, Yi Song, Xiaohui Ai
Summary: The study on the host-pathogen interaction between channel catfish and Yersinia ruckeri revealed the dynamic regulation of the transcriptome during infection, with significant upregulation of immune-related pathways. Specifically, the infection was found to be closely related to metabolic pathways, and the pathogenesis promoted by Y. ruckeri in channel catfish was mainly through the flagellum gene fliC. This research contributes to understanding how catfish respond to infection and develop enteric red mouth disease (ERM) through a transcriptional perspective.
FRONTIERS IN IMMUNOLOGY
(2021)
Article
Virology
Akihiro Ochi, Hiroshi Bannai, Hiroka Aonuma, Hirotaka Kanuka, Eri Uchida-Fujii, Yuta Kinoshita, Minoru Ohta, Yoshinori Kambayashi, Koji Tsujimura, Takanori Ueno, Manabu Nemoto
Summary: From 2016 to 2019, a study was conducted at the Miho Training Center to investigate Getah virus infection in mosquitoes and EDTA-treated blood samples from febrile racehorses. A total of 5557 mosquitoes and 331 blood samples were collected. Culex tritaeniorhynchus was the most frequently captured mosquito species (51.9%), followed by Aedes vexans nipponii (14.2%) and Anopheles sinensis (11.2%). Getah virus was detected in mosquitoes in 2016 but not in the subsequent years. A small number of febrile horses tested positive for Getah virus in 2016 and 2019, while none tested positive in 2017 and 2018. The virus strains isolated from mosquitoes and horses showed some genetic variations.
ARCHIVES OF VIROLOGY
(2023)
