TY - JOUR
T1 - Characteristics of harmful algal blooms during a low water temperature season in Lake Hachiro
AU - Araki, Miho
AU - Okano, Kunihiro
AU - Ohta, Shiori
AU - Suzuki, Eiji
AU - Fujibayashi, Megumu
AU - Miyata, Naoyuki
N1 - Funding Information:
This work was supported by the Grant-in-Aid for Young
Funding Information:
Scientists (JP16K16206) from the Japan Society for the Promotion of Science (JSPS).
Publisher Copyright:
© 2018 Japan Society on Water Environment.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - In this study, we investigated seasonal changes in chlorophyll a (Chl.a), microcystin, and the 16S rRNA gene-based cyanobacterial community structures using 16S rRNA gene amplicon analysis of the surface water of Lake Hachiro, Akita Prefecture, Japan. Moreover, we examined the growth characteristics of four Microcystis spp. strains (N1, N6, N7, and 0824) isolated from Lake Hachiro. In 2014, Chl.a and total microcystin concentrations (173.4 and 1.7 μg/L, respectively) were the highest in October, when the water temperature was less than 20°C. Although algal blooms were observed for a longer term in 2015, the concentrations of Chl.a and total microcystin also increased transiently at the end of September. The cyanobacterial compositions of algal blooms included the genera Aphanizomenon, Anabaena, Prochlorothrix, and Microcystis in 2014 and Aphanizomenon, Anabaena, and Microcystis in 2015. In October of both years, algal blooms were dominated by Microcystis spp., suggesting the presence of major producers of microcystins during this term. In laboratory cultures, Microcystis strain 0824 showed a high specific growth rate at 15°C (0.17 1/d). Low temperature -adapted Microcystis spp., such as strain 0824, may be responsible for the occurrence of harmful algal blooms during the low water temperature season in Lake Hachiro.
AB - In this study, we investigated seasonal changes in chlorophyll a (Chl.a), microcystin, and the 16S rRNA gene-based cyanobacterial community structures using 16S rRNA gene amplicon analysis of the surface water of Lake Hachiro, Akita Prefecture, Japan. Moreover, we examined the growth characteristics of four Microcystis spp. strains (N1, N6, N7, and 0824) isolated from Lake Hachiro. In 2014, Chl.a and total microcystin concentrations (173.4 and 1.7 μg/L, respectively) were the highest in October, when the water temperature was less than 20°C. Although algal blooms were observed for a longer term in 2015, the concentrations of Chl.a and total microcystin also increased transiently at the end of September. The cyanobacterial compositions of algal blooms included the genera Aphanizomenon, Anabaena, Prochlorothrix, and Microcystis in 2014 and Aphanizomenon, Anabaena, and Microcystis in 2015. In October of both years, algal blooms were dominated by Microcystis spp., suggesting the presence of major producers of microcystins during this term. In laboratory cultures, Microcystis strain 0824 showed a high specific growth rate at 15°C (0.17 1/d). Low temperature -adapted Microcystis spp., such as strain 0824, may be responsible for the occurrence of harmful algal blooms during the low water temperature season in Lake Hachiro.
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U2 - 10.2965/jwet.17-058
DO - 10.2965/jwet.17-058
M3 - Article
AN - SCOPUS:85051654429
VL - 16
SP - 175
EP - 183
JO - Journal of Water and Environment Technology
JF - Journal of Water and Environment Technology
SN - 1348-2165
IS - 4
ER -