Long-term Monitoring of Vertical Water Quality in Northern Basin of Lake Biwa

Tsuda, Taizo; Okamoto, Takahiro; Fujiwara, Naoki; Nakamura, Tadataka; Yada, Minoru; Sanuki, Noriko; Dohi, Makoto; Omoda, Miki; Ichise, Satoshi; Wakabayashi, Tetsuya; Aoki, Shigeru; Hara, Ryohei

doi:10.2965/jswe.29.565

Cited by 4 publications

(1 citation statement)

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“…Changes in the stratification structure due to climate change (Kumagai, 2008;Sakamoto, 2011) and changes in the nitrogen to phosphorus ratio (N/P ratio) (Tsuda et al, 2006;Hsieh et al, 2010) have been reported in Lake Biwa. To investigate the ecological impact of environmental change in Lake Biwa, Hsieh et al (2010) reported that the phytoplankton community shifted dramatically in response to changes in trophic status driven by phosphorus loadings and physical properties of the water column driven by warming.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cultural Conditions on the Cellular Biovolume and Gelatinous Sheath Volume of Staurastrum arctiscon (Charophyceae)

Suzuki

Kojima

Kishimoto

et al. 2013

J. of Wat. ^|^ Envir. Tech.

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This study investigated the influence of cultural conditions on the cellular biovolume (V C) and gelatinous sheath volume (V G) of Staurastrum arctiscon (Charophyceae) and its growth characteristics during laboratory culturing. A unialgal culture isolated from Lake Biwa was incubated in modified M11 medium containing various concentrations of nitrogen and phosphorous in the form of nitrate and phosphate (0.01 or 0.1 mg P/L). The N/P mass ratio of the medium and incubation temperature ranges were 5-100 and 5-35°C, respectively. V C was lower at higher incubation temperature and higher nitrate concentrations, whereas V G increased with temperature. As V C and V G changed, the size of the gelatinous sheath increased relative to the cellular biovolume (V R) with the water temperature and nitrate concentration. The enhanced growth rate and net production rate with a rising temperature were considered to contribute to the decreased V C and increased V G. The positive effect of nitrate concentration on V G was believed to be attributable to the enhanced net production rate with higher nitrate concentrations.

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