The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light
In order to investigate non-cyanobacteria dominance succession from <i>Microcystis</i> blooms, particularly to diatom dominance, an experiment using varying colonial <i>Microcystis</i> biomasses expressed as bulk concentrations of 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 1...
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2024-11-01
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| author | Xiaodong Wang Xuan Che Xingguo Liu Xinfeng Li Xiaolong Chen Yiming Li Lin Zhu |
| author_facet | Xiaodong Wang Xuan Che Xingguo Liu Xinfeng Li Xiaolong Chen Yiming Li Lin Zhu |
| author_sort | Xiaodong Wang |
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| description | In order to investigate non-cyanobacteria dominance succession from <i>Microcystis</i> blooms, particularly to diatom dominance, an experiment using varying colonial <i>Microcystis</i> biomasses expressed as bulk concentrations of 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, and 24.0 mL L<sup>−1</sup> was undertaken under continuous aeration mixing in a greenhouse during a hot summer where shading had reduced light level by 97%. The results showed that the algal shift process was affected by the initial biomass of the colonial <i>Microcystis</i>, and the algal community diversified. When the <i>Microcystis</i> bulk concentration was between 2.0 and 16.0 mL L<sup>−1</sup>, the bloom became dominated by diatom <i>Nitzschia palea</i>, which aggregated on the mucilage sheathes of the <i>Microcystis</i> colonies. The diatom density at bulk concentration biomass of 2.0 mL L<sup>−1</sup> reached a maximum at 2.8 × 10<sup>5</sup> cells mL<sup>−1</sup> on day 27. When the bulk concentration was at 18.0–24.0 mL L<sup>−1</sup>, no diatom dominance appeared. The shift from a <i>Microcystis</i> bloom to diatom dominance was affected by the initial <i>Microcystis</i> biomass, and the most suitable bulk concentration biomass for colonial <i>Microcystis</i> was at 2–12 mL L<sup>−1</sup>, in which the chlorophyll-<i>a</i> level was about from 285 to 1714 μg L<sup>−1</sup>. The mechanism underlying this algal shift may be that the low light and nutrient levels in the <i>Microcystis</i> bloom promoted diatom aggregation growth on the mucilage sheaths of <i>Microcystis</i> colonies under continuous aeration mixing. |
| format | Article |
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| institution | Kabale University |
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| language | English |
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| spelling | doaj-art-42c5cc3ba0694fc8932bfea85d82ebfa2024-11-26T18:00:28ZengMDPI AGDiversity1424-28182024-11-01161169510.3390/d16110695The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low LightXiaodong Wang0Xuan Che1Xingguo Liu2Xinfeng Li3Xiaolong Chen4Yiming Li5Lin Zhu6Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaFishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaFishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaFishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaFishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaEast China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, ChinaFishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, ChinaIn order to investigate non-cyanobacteria dominance succession from <i>Microcystis</i> blooms, particularly to diatom dominance, an experiment using varying colonial <i>Microcystis</i> biomasses expressed as bulk concentrations of 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, and 24.0 mL L<sup>−1</sup> was undertaken under continuous aeration mixing in a greenhouse during a hot summer where shading had reduced light level by 97%. The results showed that the algal shift process was affected by the initial biomass of the colonial <i>Microcystis</i>, and the algal community diversified. When the <i>Microcystis</i> bulk concentration was between 2.0 and 16.0 mL L<sup>−1</sup>, the bloom became dominated by diatom <i>Nitzschia palea</i>, which aggregated on the mucilage sheathes of the <i>Microcystis</i> colonies. The diatom density at bulk concentration biomass of 2.0 mL L<sup>−1</sup> reached a maximum at 2.8 × 10<sup>5</sup> cells mL<sup>−1</sup> on day 27. When the bulk concentration was at 18.0–24.0 mL L<sup>−1</sup>, no diatom dominance appeared. The shift from a <i>Microcystis</i> bloom to diatom dominance was affected by the initial <i>Microcystis</i> biomass, and the most suitable bulk concentration biomass for colonial <i>Microcystis</i> was at 2–12 mL L<sup>−1</sup>, in which the chlorophyll-<i>a</i> level was about from 285 to 1714 μg L<sup>−1</sup>. The mechanism underlying this algal shift may be that the low light and nutrient levels in the <i>Microcystis</i> bloom promoted diatom aggregation growth on the mucilage sheaths of <i>Microcystis</i> colonies under continuous aeration mixing.https://www.mdpi.com/1424-2818/16/11/695<i>Microcystis</i> bloomaeration mixingalgal shiftdiatom aggregation<i>Nitzschia palea</i>low light |
| spellingShingle | Xiaodong Wang Xuan Che Xingguo Liu Xinfeng Li Xiaolong Chen Yiming Li Lin Zhu The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light Diversity <i>Microcystis</i> bloom aeration mixing algal shift diatom aggregation <i>Nitzschia palea</i> low light |
| title | The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light |
| title_full | The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light |
| title_fullStr | The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light |
| title_full_unstemmed | The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light |
| title_short | The Range of the Colonial <i>Microcystis</i>’ Biomass for Shift to Diatom Aggregates Under Aeration Mixing and Low Light |
| title_sort | range of the colonial i microcystis i biomass for shift to diatom aggregates under aeration mixing and low light |
| topic | <i>Microcystis</i> bloom aeration mixing algal shift diatom aggregation <i>Nitzschia palea</i> low light |
| url | https://www.mdpi.com/1424-2818/16/11/695 |
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