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Article

Long-Term Eutrophication and Dynamics of Bloom-Forming Microbial Communities during Summer HAB in Large Arctic Lake

1
INEP, RAS, 184209 Apatity, Russia
2
Creek-Bio, 0151 Oslo, Norway
*
Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 17 May 2021 / Revised: 11 August 2021 / Accepted: 13 August 2021 / Published: 17 August 2021
Harmful algal blooms (HABs) in arctic lakes are recent phenomena. In our study, we performed a long-term analysis (1990–2017) of the eutrophication of Lake Imandra, a large subarctic lake, and explored the biodiversity of bloom-forming microorganisms of a 2017 summer HAB. We performed a 16Sr rRNA metabarcoding study of microbial communities, analysed the associations between N, P, C, and chlorophyll concentrations in the lake water, and developed models for the prediction of HABs based on total P concentration. We have demonstrated that blooms in Lake Imandra occur outside of optimal Redfield ratios and have a nonlinear association with P concentrations. We found that recent summer HABs in a lake occur as simultaneous blooms of a diatom Aulacoseira sp. and cyanobacteria Dolichospermum sp. We have studied the temporal dynamics of microbial communities during the bloom and performed an analysis of the publicly available Dolichospermum genomes to outline potential genetic mechanisms beneath simultaneous blooming. We found genetic traits requisite for diatom-diazotroph associations, which may lay beneath the simultaneous blooming of Aulacoseira sp. and Dolichospermum sp. in Lake Imandra. Both groups of organisms have the ability to store nutrients and form a dormant stage. All of these factors will ensure the further development of the HABs in Lake Imandra and the dispersal of these bloom-forming species to neighboring lakes. View Full-Text
Keywords: HABs; 16S rRNA metabarcoding; microbiota analysis; arctic lakes; eutrophication; critical nutrient loads; diatom–diazotroph associations HABs; 16S rRNA metabarcoding; microbiota analysis; arctic lakes; eutrophication; critical nutrient loads; diatom–diazotroph associations
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MDPI and ACS Style

Kashulin, N.; Kashulina, T.; Bekkelund, A. Long-Term Eutrophication and Dynamics of Bloom-Forming Microbial Communities during Summer HAB in Large Arctic Lake. Environments 2021, 8, 82. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080082

AMA Style

Kashulin N, Kashulina T, Bekkelund A. Long-Term Eutrophication and Dynamics of Bloom-Forming Microbial Communities during Summer HAB in Large Arctic Lake. Environments. 2021; 8(8):82. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080082

Chicago/Turabian Style

Kashulin, Nikolay, Tatiana Kashulina, and Alexander Bekkelund. 2021. "Long-Term Eutrophication and Dynamics of Bloom-Forming Microbial Communities during Summer HAB in Large Arctic Lake" Environments 8, no. 8: 82. https://0-doi-org.brum.beds.ac.uk/10.3390/environments8080082

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