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Burkert, Ulrike; Hyenstrand, Per; Drakare, Stina; Blomqvist, Peter

doi:10.1023/a:1011454313607

Cited by 78 publications

(7 citation statements)

References 28 publications

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“…Many researchers have devoted their study to the effect of biological factors on colony formation in M. aeruginosa. Some studies have reported that colony formation in M. aeruginosa could be induced by cladocerans or flagellates (BURKERT et al, 2001;JANG et al, 2003;HA et al, 2004). However, in the previous study conducted by our lab (YANG et al, 2006), no colonial algae were found when M. aeruginosa was cultivated with cladocerans.…”

Section: Introductionmentioning

confidence: 58%

Effect of Filtered Cultures of Flagellate Ochromonas sp. on Colony Formation in Microcystis aeruginosa

Yang

Kong

Zhang

et al. 2009

International Review of Hydrobiology

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The possible effect of filtered cultures of flagellate Ochromonas sp. on colony formation in M. aeruginosa was investigated in this paper. The results show that filtered cultures of flagellates fed with M. aeruginosa could induce colony formation in M. aeruginosa. Furthermore, induction strength is clearly dependent on the concentration of flagellates and filtered cultures. However, no colonial M. aeruginosa was found in the treatments of filtered cultures of flagellates fed with Microcystis wesenbergii, filtered cultures of flagellate fed with Chlorella pyrenoidosa, and algae homogenates. This suggests that infochemicals released from flagellates fed with M. aeruginosa may be a trigger for colony formation in M. aeruginosa. The clearance rates of flagellates on algae were markedly decreased when they were cultivated with induced colonial M.aeruginosa. These indicate that colony formation in M. aeruginosa is a predator-induced defense which could reduce predation risk from flagellates. IntroductionIn aquatic systems, information transfer through chemicals between prey and predator has gained great attention (LARSSON and DODSON. 1993). It has been reported that some predators such as carnivorous zooplankton, planktivorous fish and invertebrates would exude infochemicals to evoke behavioural or physiological defenses reaction from zooplanktons (GIL- BERT, 1966;LOOSE et al., 1993;TOLLRIAN, 1994TOLLRIAN, , 1995. This enables planktonic organisms to exhibit predator-specific responses that reduce predation risk (LASS and SPAAK, 2003).Morphological anti-predator reactions of algae have also been studied for decades; however, studies have been focused mainly on the response of green algae Scenedesmus sp. to zooplankton ( VAN HOLTHOON et al., 2003). Scenedesmus sp. is commonly observed as colony in the field; however, in axenic cultures without grazing pressure, it often fails to form colonies and remains unicellular. The bigger surface-to-volume ratios of unicellular algae could increase their nutrient uptake and light absorbency per surface area as a result 144 Z. YANG et al.

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Section: Introductionmentioning

confidence: 58%

Effect of Filtered Cultures of Flagellate Ochromonas sp. on Colony Formation in Microcystis aeruginosa

Yang

Kong

Zhang

et al. 2009

International Review of Hydrobiology

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“…Several studies have documented the occurrence of heterotrophic bacteria residency within cyanobacterial bloom biomass ( 67 – 69 ). Furthermore, non-axenic Microcystis aeruginosa will synthesize and secrete extracellular polysaccharides (EPS) upon introduction to heterotrophic species ( 70 , 71 ). The formation of EPS may act to tether and stabilize Microcystis cells together and to additional species in mutually beneficial colonies.…”

Section: Discussionmentioning

confidence: 99%

Microbiome analysis reveals Microcystis blooms endogenously seeded from benthos within wastewater maturation ponds

Romanis,

Timms,

Nebauer

et al. 2024

Appl Environ Microbiol

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Toxigenic Microcystis blooms periodically disrupt the stabilization ponds of wastewater treatment plants (WWTPs). Dense proliferations of Microcystis cells within the surface waters (SWs) impede the water treatment process by reducing the treatment efficacy of the latent WWTP microbiome. Further, water quality is reduced when conventional treatment leads to Microcystis cell lysis and the release of intracellular microcystins into the water column. Recurrent seasonal Microcystis blooms cause significant financial burdens for the water industry and predicting their source is vital for bloom management strategies. We investigated the source of recurrent toxigenic Microcystis blooms at Australia’s largest lagoon-based municipal WWTP in both sediment core (SC) and SW samples between 2018 and 2020. Bacterial community composition of the SC and SW samples according to 16S rRNA gene amplicon sequencing showed that Microcystis sp. was dominant within SW samples throughout the period and reached peak relative abundances (32%) during the summer. The same Microcystis Amplicon sequence variants were present within the SC and SW samples indicating a potential migratory population that transitions between the sediment water and SWs during bloom formation events. To investigate the potential of the sediment to act as a repository of viable Microcystis cells for recurrent bloom formation, a novel in-vitro bloom model was established featuring sediments and sterilized SW collected from the WWTP. Microcystin-producing Microcystis blooms were established through passive resuspension after 12 weeks of incubation. These results demonstrate the capacity of Microcystis to transition between the sediments and SWs in WWTPs, acting as a perennial inoculum for recurrent blooms. IMPORTANCE Cyanobacterial blooms are prevalent to wastewater treatment facilities owing to the stable, eutrophic conditions. Cyanobacterial proliferations can disrupt operational procedures through the blocking of filtration apparatus or altering the wastewater treatment plant (WWTP) microbiome, reducing treatment efficiency. Conventional wastewater treatment often results in the lysis of cyanobacterial cells and the release of intracellular toxins which pose a health risk to end users. This research identifies a potential seeding source of recurrent toxigenic cyanobacterial blooms within wastewater treatment facilities. Our results demonstrate the capacity of Microcystis to transition between the sediments and surface waters (SWs) of wastewater treatment ponds enabling water utilities to develop adequate monitoring and management strategies. Further, we developed a novel model to demonstrate benthic recruitment of toxigenic Microcystis under laboratory conditions facilitating future research into the genetic mechanisms behind bloom development.

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“…As widely reported, MCs may strengthen ecological fitness of Microcystis by resisting biochemical stressors (e.g., hydrogen peroxide, metal ions, predators) [45,46], raising the adaptability to high-radiation and oxidation conditions [46,47], enhancing competitiveness over its MC-counterparts [48], promoting large-size colonies formation [49][50][51], and helping Microcystis overwintering and recovery from cold environment [52,53]. EPSs also improve Microcystis resistance to stresses caused by many factors, such as grazing pressure by protozoa, allelochemical pressure by anti-cyanobacterial allelochemicals [54][55][56]. Thus, Microcystis can improve ecological adaption and stress-resistance by adjusting MCs and EPSs contents, which could be driven by AHLs.…”

Section: Regulatory Effects Of Endogenous Ahlsmentioning

confidence: 99%

Cyanobacterial Blooms Formation by Enhanced Ecological Adaptability and Competitive Advantage of <em>Microcystis</em>— Non-Negligible Role of Quorum-Sensing

Zhang,

2024

Preprint

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Microcystis-dominated cyanobacterial blooms (MCBs) frequently occur in freshwaters worldwide due to massive Microcystis colonies formation and severely threaten human and ecosystems health. Quorum sensing (QS) is a direct cause of Microcystis colonies formation, possibly regulating MCBs occur and Microcystis population behaviors [1, 2]. Many novel findings in fundamental knowledge of Microcystis QS phenomenon and the signaling molecules have been documented. However, little effort has devoted to comprehensively summarize and discuss research progresses and exploration direction on QS signaling molecules-mediated QS system in Microcystis. This article summarizes action process of N-acyl homoserine lactones (AHLs) as major signaling molecules in Microcystis and discussed the detailed roles of AHLs-mediated QS system in cells aggregation, colonies formation, ecological adaptability and competitive advantage. And the progress was summarized in research on the QS mechanism in Microcystis. Compared to other QS system, the LuxI/LuxR-type QS system is more likely to found in Microcystis. Also, we introduced Quorum quenching (QQ) — QS blocking process in Microcystis, with emphasizing on the potential of QS inhibitors in MCBs control. Finally, in response to the research deficiencies and gaps in Microcystis QS and QQ, we proposed several future research directions in these fields. This review may deepen the understanding of Microcystis QS knowledge and provide theoretical guidance for the development of strategies to monitor, control and harness MCBs.

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Cited by 78 publications

References 28 publications

Effect of Filtered Cultures of Flagellate Ochromonas sp. on Colony Formation in Microcystis aeruginosa

Effect of Filtered Cultures of Flagellate Ochromonas sp. on Colony Formation in Microcystis aeruginosa

Microbiome analysis reveals Microcystis blooms endogenously seeded from benthos within wastewater maturation ponds

Cyanobacterial Blooms Formation by Enhanced Ecological Adaptability and Competitive Advantage of <em>Microcystis</em>— Non-Negligible Role of Quorum-Sensing

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