

FOLLOWUS
1. Department of Resource and Environmental Engineering Henan Institute of Engineering
2. Key Laboratory of Algal Biology Institute of Hydrobiology Chinese Academy of Sciences
Online First:12 May 2016,
Published:2017
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Li, Y., Liu, B., Liu, S. et al. The trophic state of lake water regulates spatial-temporal variations of bloom-forming Microcystis, ., Chin. J. Ocean. Limnol. 35, 415–422 (2017). https://doi.org/10.1007/s00343-016-5266-z
Although biomass variations in Microcystis and microcystin have been widely reported
few studies have addressed whether different trophic states of natural lake water affect the spatial-temporal variations in abundances of microcystin-producing Microcystis in a given bloom. In this study
we used a harmful algal bloom in Chaohu Lake
eastern China
as an example to investigate the mutual relationship between different nutrient states and environmental factors
and the impact on Microcystis. Overall
cyanobacteria and Microcystis were more abundant in the middle and western parts of the lake under high nutrients levels
while in the eastern part
nutrient concentrations were low enough to limit biomass
and their fluctuations affected the contents of toxic Microcystis. Moreover
microcystin concentration was correlated positively to nutrient levels and Microcystis biomass during bloom developing in 2013 from June to August. Temporally
the cellular content of total microcystin was lowest when the bloom peaked in intensity. Our results suggest that lake eutrophication not only results in cyanobacterial blooms
but may also increase the proportion of toxic Microcystis species and their cell-bound MCs contents (i.e. microcystin cell quotas) under mild eutrophication. The present investigation provided molecular evidence for the selection of MC-producing and non-MC-producing genotypes. The current study provides new evidence advocating the monitoring of partitions of large lakes when studying cyanobacteria and toxin-contaminated freshwaters
which will be beneficial for both water agencies and water researchers.
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