Assessing the biomass and distribution of submerged aquatic vegetation using multibeam echo sounding in Lake Towada, JapanLimnology - Tập 14 - Trang 39-42 - 2012
Kazuki Abukawa, Masumi Yamamuro, Zaal Kikvidze, Akira Asada, Chunhui Xu, Kenichi Sugimoto
Here we report on an advanced survey system that combines multibeam echo sounding with underwater photography, which was used to collect accurate data on the distribution and abundance of submerged aquatic vegetation (SAV) in Lake Towada. The use of this system enabled us to visualize the cover, height, and biomass of the SAV over the lake bottom, as well as to distinguish between different compon...... hiện toàn bộ
Spatial variation of phosphorus fractions in bottom sediments and the potential contributions to eutrophication in shallow lakesLimnology - Tập 11 - Trang 5-16 - 2009
Yuichi Ishii, Satoshi Harigae, Shiho Tanimoto, Tohru Yabe, Tomohiko Yoshida, Kazuo Taki, Nobuyuki Komatsu, Keiji Watanabe, Masami Negishi, Hideki Tatsumoto
Spatial variation of phosphorus fractions in bottom sediment, pore water and overlying water in three shallow eutrophic lakes, Nishiura, Kitaura and Sotonasakaura, Japan, and the contributions of the fractional P to mobilization of phosphorus from sediment were examined in this study. The vertical distributions of dissolved inorganic phosphorus (DIP) concentrations in overlying and pore water diff...... hiện toàn bộ
Optical water types found in Brazilian watersLimnology - Tập 22 - Trang 57-68 - 2020
Edson Filisbino Freire da Silva, Evlyn Márcia Leão de Moraes Novo, Felipe de Lucia Lobo, Claudio Clemente Faria Barbosa, Mauricio Almeida Noernberg, Luiz Henrique da Silva Rotta, Carolline Tressmann Cairo, Daniel Andrade Maciel, Rogério Flores Júnior
Optical water types (OWTs) can represent diverse ranges of Chlorophyll-a (Chl-a), total suspended matter (TSM), and colored dissolved organic matter (CDOM) concentrations, which make them extremely useful for monitoring water quality, for example, detecting eutrophic conditions or tuning remote sensing algorithms. In this study, the objective is to assess OWTs found in Brazilian waters using in si...... hiện toàn bộ
Grazing on toxic and non-toxic Microcystis aeruginosa PCC7820 by Unio douglasiae and Corbicula flumineaLimnology - Tập 10 - Trang 1-5 - 2008
Ying Liu, Ping Xie, Xiao-Ping Wu
To explore the potential grazing effects of mussels on Microcystis aeruginosa, a common bloom-forming phytoplankton, Unio douglasiae and Corbicula fluminea were fed with Scenedesmus obliquus, toxic and non-toxic strains of Microcystis aeruginosa as single food and as mixtures in the laboratory. When fed with single foods, U. douglasiae has similar clearance rates on the three algae populations, wh...... hiện toàn bộ
Observation of anoxic water mass in a tropical reservoir: the Cirata Reservoir in Java, IndonesiaLimnology - Tập 9 - Trang 81-87 - 2008
Yuichi Hayami, Koji Ohmori, Kenji Yoshino, Yudhi S. Garno
We conducted a transect survey of water quality and bottom sediments in a large tropical reservoir, the Cirata Reservoir, located on the Citarum River, West Java, Indonesia. In the main basin of this reservoir, the surface water contained high concentrations of chlorophyll a, up to 48 μg l−1, and most of the water body was occupied by thick anoxic water. The thickness of the surface oxygenated wat...... hiện toàn bộ
Biotic and abiotic methane releases from Lake Biwa sediment slurryLimnology - Tập 5 - Trang 149-154 - 2004
Jianguo Dan, Takahiro Kumai, Atsuko Sugimoto, Jun Murase
To determine the rate and mechanism of CH4 production in Lake Biwa sediment, slurry was prepared and incubated. Surface sediment (sed) slurry (1.5–6 cm) showed a CH4 release rate (4.9–9.5 nmol g-dry-sed−1 day−1) higher than that observed in the 5- to 10-cm sediment slurry (0.2–2 nmol g-dry-sed−1 day−1). Methane release from the surface (1.5–6 cm) sediment slurry was biotic and was inhibited by add...... hiện toàn bộ
Monitoring fish pathogenic viruses in natural lakes in Yunnan, ChinaLimnology - Tập 16 - Trang 69-77 - 2014
Toshifumi Minamoto, Xiaoying Pu, Jie Xie, Yi Dong, Deyi Wu, Hainan Kong, Xiaoxia Yang, Teruhiko Takahara, Mie N. Honjo, Hiroki Yamanaka, Zen’ichiro Kawabata
Outbreaks of infectious diseases among freshwater fish damage the aquaculture industry. A technique for detecting pathogens in environmental water samples has recently been developed. In the present work, the monitoring of pathogenic viruses in Lake Erhai and Lake Dianchi (Yunnan, China) was performed. Yunnan possesses a rich diversity of cyprinid fish, and the aquaculture of freshwater fish is a ...... hiện toàn bộ