Article
Zoology
Renyi Zhang, Qian Tang, Lei Deng
Summary: In this study, the complete mitogenome of Microphysogobio elongatus was sequenced and analyzed, revealing its typical structure and base composition. The phylogenetic analysis showed that Microphysogobio is not a monophyletic group, providing valuable information for future studies on the molecular phylogeny and population genetics of this species.
Article
Geochemistry & Geophysics
Liang Xue, Yuning Fu, Christopher W. Johnson, Jason J. Otero Torres, C. K. Shum, Roland Burgmann
Summary: The study shows that seasonal seismicity in central Japan is influenced by hydrological loads, especially variations in lake water storage, which dominate the seasonal stress changes. The research emphasizes the importance of understanding the impact of hydrological processes on seismic activity in the region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Biology
Ling Mao, Yu Zeng, Jin Li, Fubin Zhang, Yuying Liu, Jianhan Gong
Summary: Herzensteini Gudgeon is a small fish species endemic to the upper reaches of the Jialing River and the Han River, with declining wild populations in recent decades. Research has shown controversial relationship between Gnathopogon and Gobiocypris genera, with Gobiocypris clustered within Gnathopogon genus.
Article
Multidisciplinary Sciences
Maho Iwaki, Takashi Toda
Summary: Through investigating water level fluctuations in Lake Biwa of Japan, this study found that water level fluctuations can serve as indicators of high-magnitude earthquakes. The research results indicate that water level changes are influenced by long-period Rayleigh waves, with the 3.08-3.10 hour wave being caused by forced oscillation of Rayleigh waves.
SCIENTIFIC REPORTS
(2022)
Article
Fisheries
Belay Abdissa, Abebe Getahun, Eshete Dejen
Summary: The cryopreservation of Lake Tana Labeobarbus semen was studied for the first time. DMSO 10% showed the best performance in the cryo-diluent, and a suitable preservation protocol was proposed for L. brevicephalus sperm. Further research is needed to evaluate the viability and development of larvae produced from cryopreserved sperm, as well as the sustainability and feasibility of cryogenic gene banking for sperm use.
Article
Ecology
Akira Kurasawa, Yuji Onishi, Keisuke Koba, Keitaro Fukushima, Hiromi Uno
Summary: An increasing number of studies have examined the ecological influence of semelparous and iteroparous fish migrations on spawning streams. These migrations not only contribute carcasses of spent adults, but also provide nutrients that support stream communities. This study evaluated the ecological influence of an iteroparous three-lips fish in an alluvial stream through field experiments. The results showed that the fish increased nutrient concentrations, organic matter levels, and densities of certain organisms in the stream. The study suggests that further research is needed to understand the complex ways in which migratory fish influence stream ecosystems.
FRESHWATER BIOLOGY
(2023)
Article
Microbiology
Shang Shen, Yoshihisa Shimizu
Summary: Viruses regulate prokaryotic abundance and the carbon cycle by infecting and lysing their prokaryotic hosts, with the volume of infected prokaryotes being an important parameter to understand their impact on aquatic environments. A study in Lake Biwa, Japan, found that the seasonal and spatial variations in the cell volume of infected prokaryotes play a significant role in understanding the dynamics of prokaryotic communities, with different ways of maintaining viral abundance in surface and deeper layers. Viral infection rates and cell volumes of infected prokaryotes were observed to change throughout the study period, indicating complex interactions between viruses and prokaryotes in different water layers.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Multidisciplinary Sciences
Jinxin Zhou, Takero Yoshida, Daisuke Kitazawa
Summary: As awareness of climate-related freshwater quality problems increases, more research is needed to understand the impact of climate on water quality. This study used a model to investigate the relationship between climatic variables, mixing regime, and nutrient status in Lake Biwa. The results suggest that changes in mixing timing may negatively affect water quality.
SCIENTIFIC REPORTS
(2022)
Article
Environmental Sciences
Tatsuo Saito, Hiromi Yamazawa, Akihito Mochizuki
Summary: The seasonal variation in dissolved uranium concentrations in Lake Biwa's epilimnion was successfully reproduced using geochemical calculations. The model considered factors such as water source mixing, soil surface uranium adsorption, and chemical equilibrium of major species. The optimized parameters for total uranium and soil surface cation-exchange capacity were used to reproduce the observed uranium concentrations.
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
(2022)
Article
Computer Science, Interdisciplinary Applications
Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
Summary: The currents of gyre flow have a significant impact on the transportation and mixing of nutrients and chemical substances in water bodies. This study aimed to investigate the effect of climate change on the flow field in Lake Biwa using a three-dimensional hydrodynamic model. Numerical simulations were conducted to analyze the sensitivity of air temperature, wind speed, and precipitation changes on the flow field. The results showed that changes in air temperature and precipitation affected the stratification and vorticity in each season, while wind speed changes significantly influenced the strength and radius of the gyre in Lake Biwa.
JOURNAL OF HYDROINFORMATICS
(2023)
Article
Fisheries
Belay Abdissa, Abebe Getahun, Eshete Dejen
Summary: Researchers in Lake Tana, Ethiopia, have developed artificial spawning emulation structures to facilitate the spawning migration of Labeobarbus brevicephalus, an endemic fish species. By simulating the lake and tributary rivers, the researchers successfully induced the fish to migrate from a pond to gravel beds in the upper part of a canal for spawning.
AQUACULTURE REPORTS
(2022)
Article
Water Resources
Satoshi Nakada, Akio Imai, Koichi Shimotori, Kenta Yamada, Haruki Yamamoto, Takahiro Okamoto
Summary: This study reveals that the mixing regime in Lake Biwa may be shifting from monomictic to oligomictic system due to a decrease in winter wind speed, leading to weakened surface cooling and interruption in monomictic mixing.
HYDROLOGICAL SCIENCES JOURNAL
(2023)
Article
Multidisciplinary Sciences
Takehiro Kazama, Kazuhide Hayakawa, Victor S. Kuwahara, Koichi Shimotori, Akio Imai, Kazuhiro Komatsu
Summary: This study aims to construct a robust CYRILLIC CAPITAL LETTER EFe,C model for freshwater ecosystems using FRRf technology combined with traditional carbon fixation rate measurement methods. The research found that water temperature is one of the most significant factors affecting CYRILLIC CAPITAL LETTER EFe,C.
Article
Evolutionary Biology
Osamu Miura, Atsushi Toyoda, Tetsuya Sakurai
Summary: This study reports the chromosome-scale genome assembly of the freshwater snail species Semisulcospira habei, providing a high-quality genomic resource for elucidating the genomic background of its adaptive radiation.
GENOME BIOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Maho Iwaki, Yosuke Yamashiki, Takashi Toda, Chunmeng Jiao, Michio Kumagai
Summary: By analyzing a lake catchment system, the study identified the average precipitation retention time and found that the precipitation retention time during snowmelt is shorter than during the dry season. The shape of the response function reflects the lake system and this knowledge can aid lake resource management and conservation efforts.
