Phylogeny and salt-tolerance of freshwater Nostocales strains: Contribution to their systematics and evolution

Duval, Clément; Thomazeau, Solène; Drelin, Yannick; Yéprémian, Claude; Bouvy, Marc; Couloux, Arnaud; Troussellier, Marc; Rousseau, Florence; Bernard, Cécile

doi:10.1016/j.hal.2018.01.008

Cited by 17 publications

(6 citation statements)

References 45 publications

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“…The species has a preference for low-salinity conditions, with optimal growth in oligohaline water conditions (0.5-5 ppm) (Chapman & Schelske, 1997;Padisák, 1997;Karadžić et al, 2013;Antunes et al, 2015;Duval et al, 2018). Higher values of salinity (≥ 30 ppm) are considered limiting to its growth (Moisander et al, 2012); however, C. raciborskii has the capacity to dominate in brackish waters, particularly when there are enriched nutrient conditions (Calandrino & Paerl, 2011;Engström-Öst et al, 2015), or high concentrations of dissolved minerals, especially high sulfate concentrations (Briand et al, 2002 conditions that cause changes in precipitation can alter the salinity of estuarine systems and contribute to the dominance of the species in those ecosystems.…”

Section: Salinitymentioning

confidence: 99%

Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

2020

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Aim Cylindrospermopsis raciborskii (Woloszynska) Seenayya and Subba Raju, also called Raphidiopsis raciborskii, is a diazotrophic and filamentous cyanobacterium with terminal heterocytes, belonging to the order Nostocales. It has been the focus of several studies due to its toxicity and wide geographic distribution. Methods To understand its autecology and to identify the key factors that control its dominance, the present review discusses, based on recent publications, whether the expansion of this species is a result of a high metabolic plasticity or the existence of distinct ecotypes. Results Among the factors influencing C. raciborskii growth are its ability to survive in wide temperature, light intensity and pH ranges; to dominate in both stratified and mixed environments; to tolerate oligohaline conditions; to produce and secrete allelopathic substances; suffer little herbivore pressure; and although associated with a eutrophic environment, to tolerate low concentration of phosphorus and nitrogen with a high affinity for ammonia. Conclusions Due to these differences in the environmental conditions of growth and development found in various studies, we suggest the existence of different ecotypes that will predominate under specific environmental conditions as the most appropriate hypothesis.

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Section: Salinitymentioning

confidence: 99%

Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

2020

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“…Nevertheless, the high level of taxonomic novelty found in the coastal mangrove biofilms in Mayotte is already self-evident based on our results. Very limited data are available on the taxonomic diversity of marine cyanobacteria in Mayotte, except for a recent paper describing Nostocales cyanobacterial strains, which are not closely related to the strains described herein, and belong to the genera Chrysosporum, Dolichospermum, Raphidiopsis (Duval et al, 2018). Overall, the novelty level shown here shows that the cyanobacterial diversity is mostly unexplored in Mayotte.…”

Section: Mangroves Of Mayotte Island Are a Source Of Novel Cyanobacteriamentioning

confidence: 71%

Diversity, metabolome profiling and bioactivities of benthic filamentous cyanobacteria isolated from coastal mangroves of Mayotte

Wang,

Halary,

Duval

et al. 2023

Front. Mar. Sci.

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IntroductionCyanobacteria are important members of the dense biofilms that colonize available substrates in mangrove habitats worldwide. However, their taxonomic diversity and biological activities have received little attention.MethodsThe occurrence of cyanobacteria is evaluated in 27 biofilms collected from mangroves in Mayotte. Filamentous cyanobacterial strains were isolated and characterized using 16S rRNA comparative gene sequence analysis. LC-MS/MS experiments were performed on the crude extracts of the faster-growing strains, and construction of their molecular network showed a conspectus of their chemical diversity. Biological activities of the strain extracts were then evaluated using standard assays.Results and discussionIsolation procedures yielded 43 strains representing 22 species-level taxa, of which only three could be assigned to existing species. Some of these strains were among the most abundant cyanobacteria present in biofilms. PCR assays did not support the production of the major cyanotoxins. Analysis of metabolites from 23 strains using both in silico tools ISDB- DNP (In silico Data Base–Dictionary of Natural Products) and MolDiscovery, revealed occurrence of godavarin K, a limonoid natural product previously isolated from the seeds of an Indian mangrove tree. This annotation was further confirmed by the marine database MarinLit, suggesting that cyanobacteria might be an alternative source of godavarin K and its four isomers. While no significant antimicrobial and cytotoxic activities were observed, some strains exhibited anthelmintic and antibiofilm activities that warrant further investigation and may be relevant to biofilm ecology. Mangrove biofilms thus appear to be an untapped reservoir of novel culturable cyanobacterial lineages, with bioactivities relevant to their biofilm lifestyle, which may be of interest for bioinspiration.

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“…were only found in abundances greater than 1% at three sites (Nyando R. mouth, Dunga, and Maboko Island) in the northeastern portion of the Gulf (Sitoki et al, 2012 ). The ASVs associated with Dolichospermum throughout the Gulf were most related to Dolichospermum flos‐aquae PMC206.03 isolated from Senegal, with percent identities ranging from 99.6% to 100% (Duval et al, 2018 ).…”

Section: Resultsmentioning

confidence: 99%

Bacterial community and cyanotoxin gene distribution of the Winam Gulf, Lake Victoria, Kenya

Brown,

Barker,

Wagner

et al. 2024

Environ Microbiol Rep

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The Winam Gulf (Kenya) is frequently impaired by cyanobacterial harmful algal blooms (cHABs) due to inadequate wastewater treatment and excess agricultural nutrient input. While phytoplankton in Lake Victoria have been characterized using morphological criteria, our aim is to identify potential toxin‐producing cyanobacteria using molecular approaches. The Gulf was sampled over two successive summer seasons, and 16S and 18S ribosomal RNA gene sequencing was performed. Additionally, key genes involved in production of cyanotoxins were examined by quantitative PCR. Bacterial communities were spatially variable, forming distinct clusters in line with regions of the Gulf. Taxa associated with diazotrophy were dominant near Homa Bay. On the eastern side, samples exhibited elevated cyrA abundances, indicating genetic capability of cylindrospermopsin synthesis. Indeed, near the Nyando River mouth in 2022, cyrA exceeded 10 million copies L−1 where there were more than 6000 Cylindrospermopsis spp. cells mL−1. In contrast, the southwestern region had elevated mcyE gene (microcystin synthesis) detections near Homa Bay where Microcystis and Dolichospermum spp. were observed. These findings show that within a relatively small embayment, composition and toxin synthesis potential of cHABs can vary dramatically. This underscores the need for multifaceted management approaches and frequent cyanotoxin monitoring to reduce human health impacts.

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Phylogeny and salt-tolerance of freshwater Nostocales strains: Contribution to their systematics and evolution

Cited by 17 publications

References 45 publications

Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

Autecology of Cylindrospermopsis raciborskii (Woloszynska) Seenayya et Subba Raju

Diversity, metabolome profiling and bioactivities of benthic filamentous cyanobacteria isolated from coastal mangroves of Mayotte

Bacterial community and cyanotoxin gene distribution of the Winam Gulf, Lake Victoria, Kenya

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