Cyanobacteria diversity in alkaline saline lakes in the Brazilian Pantanal wetland: a polyphasic approach

Costa, Naíla Barbosa da; Kolman, María A.; Giani, Alessandra

doi:10.1093/plankt/fbw066

Cited by 21 publications

(23 citation statements)

References 58 publications

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“…Usually, the most extreme cyanobacterial blooms are found during the driest period (August to November), with the highest alkalinity, EC and temperature values (Santos et al, 2011). Two major bloom-forming cyanobacterium have been identified (Andreote et al, 2014;Costa et al, 2016;Genuário et al, 2017;Vaz et al, 2015), Anabaenopsis elenikinii and Arthrospira platensis, primary producer (halo)alkaliphilic oxygenic cyanobacteria (Sorokin et al, 2015) that fix inorganic carbon and produce oxygen. These blooms occur during the 5 dry season and disappear in a few hours after the first heavy rains of the wet season.…”

Section: Studied Areamentioning

confidence: 99%

Biogeochemical diversity and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil

Barbiéro

Neto

Braz

et al. 2017

Preprint

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Abstract. Nhecolândia is a vast sub-region of the Pantanal wetland in Brazil with great diversity in surface water chemistry evolving in a sodic alkaline pathway under the influence of evaporation. In this region, more than 15,000 shallow lakes are likely to contribute an enormous quantity of greenhouse gas to the atmosphere, but the diversity of the biogeochemical scenarios and their variability in time and space is a major challenge to estimate the regional contribution. In this study, we compiled measurements of the physico-chemical characteristics of water and sediments, gas fluxes in floating chambers, and 25 sedimentation rates to illustrate this diversity. Although these lakes have a similar chemical composition, the results confirm an opposition between the black-water and green-water alkaline lakes, corresponding to distinct biogeochemical functioning.Black-water lakes are CO 2 and CH 4 sources, with fairly constant emissions throughout the seasons. Annual carbon dioxide and methane emissions approach 790 mmol m -2 y -1 and 73 mmol m -2 y -1 , respectively. By contrast, green-water lakes are CO 2 sinks but significant CH 4 sources with fluxes varying significantly throughout the seasons, depending on the 30 development of the cyanobacterial bloom. The results highlight two hot moments for methane emissions. The first one is suspected after the disappearance of the cyanobacterial bloom, which is accompanied by a drop in pH of the upper part of the sediments. The second one is identified when the O 2 -supersaturation is reached under extreme bloom and sunny weather conditions, which provoke an abrupt O 2 purging of the lakes. Taking into account the seasonal variability, annual methane emissions are around 8,850 mmol m -2 y -1 , i.e., much higher than reported in previous studies for alkaline lakes in

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Section: Studied Areamentioning

confidence: 99%

Biogeochemical diversity and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil

Barbiéro

Neto

Braz

et al. 2017

Preprint

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“…Nitrogen fixation (NF) in moderately saline soda lakes (below 40 g/l) is usually attributed to heterocystous cyanobacteria. Blooms of Anabaenopsis spp., Cyanospira spp., Nodularia spumigena are frequent in the water column of Pyramid Lake in the USA (Galat et al 1990), Alchichica in Mexico (Oliva et al 2009), lakes of the East African Rift (Grant and Jones 2016;Krienitz and Schagerl 2016) and the Brazilian Pantanal region (Andreote et al 2018;Costa et al 2016). Shallow soda lakes of south Siberia are located in cryo-arid continental climate and subjected to high amplitude of the hydro-chemical fluctuations which cause significant successional changes of microbial communities.…”

Section: Introductionmentioning

confidence: 99%

The patterns of nitrogen fixation in haloalkaliphilic phototrophic communities of Kulunda Steppe soda lakes (Altai, Russia)

Samylina

Намсараев

Grouzdev

et al. 2019

FEMS Microbiology Ecology

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Nitrogen fixation (NF) of phototrophic communities was studied in a number of soda lakes with a wide range of salinity (25–400 g/l) located in Kulunda Steppe (Altai, Russia) during several summer seasons (2011–2016). The phototrophic communities were represented by the algal-bacterial Ctenocladus communities or cyanobacterial biofilms dominated by heterocystous and non-heterocystous cyanobacteria and purple sulfur bacteria Ectothiorhodospira sp. (up to 210 g/l) and endoevaporitic Euhalothece communities dominated by the extremely salt-tolerant unicellular cyanobacterium Euhalothece sp. and Ectothiorhodospira sp. (above 350 g/l). Salinity was the major factor influencing the composition and NF potential of the phototrophic communities. The communities dominated by vegetative heterocystous cyanobacteria exhibited light-independent NF at total salinity up to 60 g/l. The communities dominated by non-heterocystous cyanobacteria exhibited light-dependent NF in a range of 55–100 g/l, but it was significantly suppressed at 100 g/l. At 160–200 g/l the dark heterotrophic NF was a prevailing process if communities didn't contain Euhalothece sp. At salt-saturating ranges above 350 g/l, light-dependent NF associated with the Euhalothece communities was detected. A statistically significant positive correlation between the NF and diurnal light intensity was found in all samples of communities dominated by non-heterocystous cyanobacteria in contrast to communities dominated by heterocystous cyanobacteria with insignificant correlation coefficients.

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“…There has been a recent increase in the number of studies on natural products synthesized by Brazilian cyanobacteria, particularly on toxins and protease inhibitors [43,44,[51][52][53]. However, the diversity of these organisms and their natural products will likely expand as these ecosystems are further explored [54][55][56]. Therefore, strains were isolated from different biomes and their biosynthetic potential in culture conditions is discussed here.…”

Section: Discussionmentioning

confidence: 99%

“…Caatinga, the biome in which Aulosira, Calothrix, Chroococcidiopsis, Cyanospira, Fischerella, Lyngbya, Nostoc, and Phormidium strains (No. 17-43 in Table S1) were isolated, is a semiarid region with singular adapted species that is largely neglected by conservation policies in Brazil [54]. Lastly, Alkalinema, Geminocystis, Leptolyngbya, Nodosilinea, Nostoc, Pannus, and Pantanalinema strains (No.…”

Section: Cyanobacterial Strainsmentioning

confidence: 99%

“…Lastly, Alkalinema, Geminocystis, Leptolyngbya, Nodosilinea, Nostoc, Pannus, and Pantanalinema strains (No. 1 and 46-59 in Table S1) were isolated from the Pantanal, which is the largest continental wetland on the planet and is colonized by unique cyanobacteria [54]. The strains are maintained in the UHCC culture collection of the University of Helsinki, Helsinki, Finland, and the culture collection of CENA/University of São Paulo, Piracicaba, São Paulo, Brazil.…”

Section: Cyanobacterial Strainsmentioning

confidence: 99%

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Dereplication of Natural Products with Antimicrobial and Anticancer Activity from Brazilian Cyanobacteria

Shishido

Popin

Jokela

et al. 2019

Toxins

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Cyanobacteria are photosynthetic organisms that produce a large diversity of natural products with interesting bioactivities for biotechnological and pharmaceutical applications. Cyanobacterial extracts exhibit toxicity towards other microorganisms and cancer cells and, therefore, represent a source of potentially novel natural products for drug discovery. We tested 62 cyanobacterial strains isolated from various Brazilian biomes for antileukemic and antimicrobial activities. Extracts from 39 strains induced selective apoptosis in acute myeloid leukemia (AML) cancer cell lines. Five of these extracts also exhibited antifungal and antibacterial activities. Chemical and dereplication analyses revealed the production of nine known natural products. Natural products possibly responsible for the observed bioactivities and five unknown, chemically related chlorinated compounds present only in Brazilian cyanobacteria were illustrated in a molecular network. Our results provide new information on the vast biosynthetic potential of cyanobacteria isolated from Brazilian environments.

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Cyanobacteria diversity in alkaline saline lakes in the Brazilian Pantanal wetland: a polyphasic approach

Cited by 21 publications

References 58 publications

Biogeochemical diversity and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil

Biogeochemical diversity and hot moments of GHG emissions from shallow alkaline lakes in the Pantanal of Nhecolândia, Brazil

The patterns of nitrogen fixation in haloalkaliphilic phototrophic communities of Kulunda Steppe soda lakes (Altai, Russia)

Dereplication of Natural Products with Antimicrobial and Anticancer Activity from Brazilian Cyanobacteria

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