Depth-Dependent Spatiotemporal Dynamics of Overwintering Pelagic Microcystis in a Temperate Water Body

Cyanobacteria in the genus Microcystis are dominant components of many harmful algal blooms worldwide. Their pelagic–benthic life cycle helps them survive periods of adverse conditions and contributes greatly to their ecological success. Many studies on Microcystis overwintering have focused on bent...

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Bibliographic Details
Published in:Microorganisms (Basel) 2021-08, Vol.9 (8), p.1718
Main Authors: Tian, Haolun, Jin, Junjie, Chen, Bojian, Lefebvre, Daniel D., Lougheed, Stephen C., Wang, Yuxiang
Format: Article
Language:English
Subjects:
Abundance
algal bloom
Algal blooms
Biomass
CHAB
Cyanobacteria
Distribution patterns
Eutrophication
Genes
Ice
Inoculum
Lakes
Life cycles
microcystin
Microcystins
Microcystis
Overwintering
Population
Population dynamics
real-time PCR
Sediments
Spatial distribution
Temporal distribution
Toxicity
vertical distribution
Water bodies
Water circulation
Water column
Water depth
Water quality
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Summary:Cyanobacteria in the genus Microcystis are dominant components of many harmful algal blooms worldwide. Their pelagic–benthic life cycle helps them survive periods of adverse conditions and contributes greatly to their ecological success. Many studies on Microcystis overwintering have focused on benthic colonies and suggest that sediment serves as the major inoculum for subsequent summer blooms. However, the contemporaneous overwintering pelagic population may be important as well but is understudied. In this study, we investigated near-surface and near-bottom pelagic population dynamics of both microcystin-producing Microcystis and total Microcystis over six weeks in winter at Dog Lake (South Frontenac, ON, Canada). We quantified relative Microcystis concentrations using real-time PCR. Our results showed that the spatiotemporal distribution of overwintering pelagic Microcystis was depth dependent. The abundance of near-bottom pelagic Microcystis declined with increased depth with no influence of depth on near-surface Microcystis abundance. In the shallow region of the lake (90%). However, the proportion of near-surface Microcystis rose sharply to over 60% as the depth increased to approximately 18 m. The depth-dependent distribution pattern was found to be similar in both microcystin-producing Microcystis and total Microcystis. Our results suggest the top of the water column may be a more significant contributor of Microcystis recruitment inoculum than previously thought and merits more attention in early CHAB characterization and remediation.
ISSN:2076-2607
2076-2607
DOI:10.3390/microorganisms9081718