Role of Environmental Factors and Toxic Genotypes in the Regulation of Microcystins-Producing Cyanobacterial Blooms

The aim of this study was to understand: (1) how environmental conditions can contribute to formation of Microcystis-dominated blooms in lowland, dam reservoirs in temperate climate—with the use of quantitative molecular monitoring, and (2) what is the role of toxic Microcystis genotypes in the bloo...

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Veröffentlicht in:Microbial ecology 2014-02, Vol.67 (2), p.465-479
Hauptverfasser: G gała, Ilona, Izydorczyk, Katarzyna, Jurczak, Tomasz, Pawełczyk, Jakub, Dziadek, Jarosław, Wojtal-Frankiewicz, Adrianna, Jóźwik, Adam, Jaskulska, Aleksandra, Mankiewicz-Boczek, Joanna
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container_end_page 479
container_issue 2
container_start_page 465
container_title Microbial ecology
container_volume 67
creator G gała, Ilona
Izydorczyk, Katarzyna
Jurczak, Tomasz
Pawełczyk, Jakub
Dziadek, Jarosław
Wojtal-Frankiewicz, Adrianna
Jóźwik, Adam
Jaskulska, Aleksandra
Mankiewicz-Boczek, Joanna
description The aim of this study was to understand: (1) how environmental conditions can contribute to formation of Microcystis-dominated blooms in lowland, dam reservoirs in temperate climate—with the use of quantitative molecular monitoring, and (2) what is the role of toxic Microcystis genotypes in the bloom functioning. Monitoring of the Sulejow Reservoir in 2009 and 2010 in two sites Tresta (TR) and Bronislawow BR), which have different morphometry, showed that physicochemical conditions were always favorable for cyanobacterial bloom formation. In 2009, the average biomass of cyanobacteria reached 13 mg L⁻¹ (TR) and 8 mg L⁻¹ (BR), and in the second year, it decreased to approximately 1 mg L⁻¹ (TR and BR). In turns, the mean number of toxic Microcystis genotypes in the total Microcystis reached 1 % in 2009, both in TR and BR, and in 2010, the number increased to 70 % in TR and 14 % in BR. Despite significant differences in the biomass of cyanobacteria in 2009 and 2010, the mean microcystins (MCs) concentration and toxicity stayed at a similar level of approximately 1 μg L⁻¹. Statistical analysis indicated that water retention time was a factor that provided a significant difference between the two monitoring seasons and was considered a driver of the changes occurring in the Sulejow Reservoir. Hydrologic differences, which occurred between two studied years due to heavy flooding in Poland in 2010, influenced the decrease in number of Microcystis biomass by causing water disturbances and by lowering water temperature. Statistical analysis showed that Microcystis aeruginosa biomass and 16S rRNA gene copy number representing Microcystis genotypes in both years of monitoring could be predicted on the basis of total and dissolved phosphorus concentrations and water temperature. In present study, the number of mcyA gene copies representing toxic Microcystis genotypes could be predicted based on the biomass of M. aeruginosa. Moreover, MCs toxicity and concentration could be predicted on the basic of mcyA gene copy number and M. aeruginosa (biomass, 16S rRNA), respectively. Present findings may indicate that Microcystis can regulate the number of toxic genotypes, and in this way adjust the whole bloom to be able to produce MCs at the level which is necessary for its maintenance in the Sulejow Reservoir under stressful hydrological conditions.
doi_str_mv 10.1007/s00248-013-0303-3
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Monitoring of the Sulejow Reservoir in 2009 and 2010 in two sites Tresta (TR) and Bronislawow BR), which have different morphometry, showed that physicochemical conditions were always favorable for cyanobacterial bloom formation. In 2009, the average biomass of cyanobacteria reached 13 mg L⁻¹ (TR) and 8 mg L⁻¹ (BR), and in the second year, it decreased to approximately 1 mg L⁻¹ (TR and BR). In turns, the mean number of toxic Microcystis genotypes in the total Microcystis reached 1 % in 2009, both in TR and BR, and in 2010, the number increased to 70 % in TR and 14 % in BR. Despite significant differences in the biomass of cyanobacteria in 2009 and 2010, the mean microcystins (MCs) concentration and toxicity stayed at a similar level of approximately 1 μg L⁻¹. Statistical analysis indicated that water retention time was a factor that provided a significant difference between the two monitoring seasons and was considered a driver of the changes occurring in the Sulejow Reservoir. Hydrologic differences, which occurred between two studied years due to heavy flooding in Poland in 2010, influenced the decrease in number of Microcystis biomass by causing water disturbances and by lowering water temperature. Statistical analysis showed that Microcystis aeruginosa biomass and 16S rRNA gene copy number representing Microcystis genotypes in both years of monitoring could be predicted on the basis of total and dissolved phosphorus concentrations and water temperature. In present study, the number of mcyA gene copies representing toxic Microcystis genotypes could be predicted based on the biomass of M. aeruginosa. Moreover, MCs toxicity and concentration could be predicted on the basic of mcyA gene copy number and M. aeruginosa (biomass, 16S rRNA), respectively. 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Hydrologic differences, which occurred between two studied years due to heavy flooding in Poland in 2010, influenced the decrease in number of Microcystis biomass by causing water disturbances and by lowering water temperature. Statistical analysis showed that Microcystis aeruginosa biomass and 16S rRNA gene copy number representing Microcystis genotypes in both years of monitoring could be predicted on the basis of total and dissolved phosphorus concentrations and water temperature. In present study, the number of mcyA gene copies representing toxic Microcystis genotypes could be predicted based on the biomass of M. aeruginosa. Moreover, MCs toxicity and concentration could be predicted on the basic of mcyA gene copy number and M. aeruginosa (biomass, 16S rRNA), respectively. Present findings may indicate that Microcystis can regulate the number of toxic genotypes, and in this way adjust the whole bloom to be able to produce MCs at the level which is necessary for its maintenance in the Sulejow Reservoir under stressful hydrological conditions.</description><subject>Biological and medical sciences</subject><subject>Biomass</subject><subject>Biomedical and Life Sciences</subject><subject>Chemical Phenomena</subject><subject>Cyanobacteria</subject><subject>DNA, Bacterial - genetics</subject><subject>Ecology</subject><subject>Environmental conditions</subject><subject>Environmental factors</subject><subject>Environmental Monitoring</subject><subject>Eutrophication</subject><subject>Fresh Water - microbiology</subject><subject>Fundamental and applied biological sciences. 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Izydorczyk, Katarzyna ; Jurczak, Tomasz ; Pawełczyk, Jakub ; Dziadek, Jarosław ; Wojtal-Frankiewicz, Adrianna ; Jóźwik, Adam ; Jaskulska, Aleksandra ; Mankiewicz-Boczek, Joanna</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c547t-13d6fc3e3376edd68c35b0c816d630f659cdaeb62610399b6ac68b5e0281338c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Biological and medical sciences</topic><topic>Biomass</topic><topic>Biomedical and Life Sciences</topic><topic>Chemical Phenomena</topic><topic>Cyanobacteria</topic><topic>DNA, Bacterial - genetics</topic><topic>Ecology</topic><topic>Environmental conditions</topic><topic>Environmental factors</topic><topic>Environmental Monitoring</topic><topic>Eutrophication</topic><topic>Fresh Water - microbiology</topic><topic>Fundamental and applied biological sciences. 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Monitoring of the Sulejow Reservoir in 2009 and 2010 in two sites Tresta (TR) and Bronislawow BR), which have different morphometry, showed that physicochemical conditions were always favorable for cyanobacterial bloom formation. In 2009, the average biomass of cyanobacteria reached 13 mg L⁻¹ (TR) and 8 mg L⁻¹ (BR), and in the second year, it decreased to approximately 1 mg L⁻¹ (TR and BR). In turns, the mean number of toxic Microcystis genotypes in the total Microcystis reached 1 % in 2009, both in TR and BR, and in 2010, the number increased to 70 % in TR and 14 % in BR. Despite significant differences in the biomass of cyanobacteria in 2009 and 2010, the mean microcystins (MCs) concentration and toxicity stayed at a similar level of approximately 1 μg L⁻¹. Statistical analysis indicated that water retention time was a factor that provided a significant difference between the two monitoring seasons and was considered a driver of the changes occurring in the Sulejow Reservoir. Hydrologic differences, which occurred between two studied years due to heavy flooding in Poland in 2010, influenced the decrease in number of Microcystis biomass by causing water disturbances and by lowering water temperature. Statistical analysis showed that Microcystis aeruginosa biomass and 16S rRNA gene copy number representing Microcystis genotypes in both years of monitoring could be predicted on the basis of total and dissolved phosphorus concentrations and water temperature. In present study, the number of mcyA gene copies representing toxic Microcystis genotypes could be predicted based on the biomass of M. aeruginosa. Moreover, MCs toxicity and concentration could be predicted on the basic of mcyA gene copy number and M. aeruginosa (biomass, 16S rRNA), respectively. Present findings may indicate that Microcystis can regulate the number of toxic genotypes, and in this way adjust the whole bloom to be able to produce MCs at the level which is necessary for its maintenance in the Sulejow Reservoir under stressful hydrological conditions.</abstract><cop>New York</cop><pub>Springer-Verlag</pub><pmid>24241584</pmid><doi>10.1007/s00248-013-0303-3</doi><tpages>15</tpages></addata></record>
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source MEDLINE; SpringerNature Journals; JSTOR Archive Collection A-Z Listing
subjects Biological and medical sciences
Biomass
Biomedical and Life Sciences
Chemical Phenomena
Cyanobacteria
DNA, Bacterial - genetics
Ecology
Environmental conditions
Environmental factors
Environmental Monitoring
Eutrophication
Fresh Water - microbiology
Fundamental and applied biological sciences. Psychology
genes
GENES AND GENOMES
Genotype
Genotypes
Geoecology/Natural Processes
Life Sciences
Microbial Ecology
Microbiology
Microcystins
Microcystins - biosynthesis
Microcystis
Microcystis - genetics
Microcystis - isolation & purification
Microcystis aeruginosa
monitoring
morphometry
Nature Conservation
phosphorus
physicochemical properties
Poland
Polymerase chain reaction
Product category rules
Reservoirs
Retention time
ribosomal RNA
RNA, Ribosomal, 16S - genetics
rRNA genes
Seasons
Sequence Analysis, DNA
Statistical analysis
temperate zones
Temperature
Toxicity
Water Microbiology
Water Quality/Water Pollution
Water temperature
Zooplankton
title Role of Environmental Factors and Toxic Genotypes in the Regulation of Microcystins-Producing Cyanobacterial Blooms
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