Freshwater Picocyanobacteria: Single Cells, Microcolonies and Colonial Forms

Callieri, Cristiana; Cronberg, Gertrud; Stockner, John G.

doi:10.1007/978-94-007-3855-3_8

Cited by 73 publications

(77 citation statements)

References 264 publications

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“…These monoclonal microcolonies, similar to those found in nature, should not be mistaken for aggregates like the ones that form after exposition to high blue light, as a result of the production of oxygen reactive radicals (Koblížek et al, 2000). It has been suggested that microcolonies may be considered transition forms from single-cells to true colonial, changing the trophic role of Synechococcus in the food web (Callieri et al, 2012). Microcolonies are generally present throughout the euphotic zone, with a peak of abundance in summer or autumn in a variety of lakes (Passoni and Callieri, 2000;Komárková, 2002;Crosbie et al, 2003b;Mózes et al, 2006;Ivanikova et al, 2007).…”

Section: Picocyanobacteriamentioning

confidence: 87%

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Micro-players for macro-roles: aquatic microbes in deep lakes

Callieri

2016

J Limnol

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Section: Picocyanobacteriamentioning

confidence: 87%

“…Two main genera, Synechococcus and Cyanobium, dominate in freshwaters. Synechococcus can be present in lakes both as single-cell and as microcolony (Passoni and Callieri, 2000;Callieri at al., 2012) (Fig. 1).…”

Section: Picocyanobacteriamentioning

confidence: 99%

Micro-players for macro-roles: aquatic microbes in deep lakes

Callieri

2016

J Limnol

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“…Among the 19 broadly distributed algae (in ≥11 sites), 14 have been identified at species level ( Callieri et al (2012). The number of species and genera per site ranged between (0)1 and 85, and 1 to 35, respectively (Fig.…”

Section: Diversity and Abundance Of Cyanoprokaryotesmentioning

confidence: 99%

Assessment of cyanoprokaryote blooms and of cyanotoxins in Bulgaria in a 15-years period (2000-2015)

et al. 2017

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The scientific and public awareness of hazardous photosynthetic prokaryotes (cyanobacteria/cyanoprokaryotes) and especially the contamination of drinking-water reservoirs with cyanotoxins is world-wide increasing. Recently much more attention has been paid to the events and results of mass proliferation of these toxic organisms even in South-East European countries in spite of the fact that, as a rule, they are not controlled by national legislation.The present paper presents a summary of results of such studies carried out in summer-autumn periods of the last 15 years (2000-2015) in Bulgarian water bodies differing by location, morphometry and trophic status, incl. drinking water reservoirs, recreational lakes and sites of nature conservation importance. A multivariate analysis allowed to outline the distribution patterns and environmental drivers of the planktonic cyanoprokaryote assemblages in relation with the available data on the water bodies, highlighting species composition and abundance of the main taxa, including potentially toxic species. Samples analysis by HPLC-DAD and/or LC/MS, ELISA and in vitro cytotoxicity tests allowed detection of microcystins, nodularins and saxitoxins. Toxin concentration ranged between 0.1 and 26.5 µg L-1 in water samples and between 10.9 and 1070 µg g-1 (d.w.) in concentrated (net) samples. Despite the fact that microcystins were not found in all studied water bodies and that the recorded levels were still lower in comparison with some other European countries, the fact that cyanotoxins were detected in 16 water bodies (incl. 3 drinking water reservoirs) could serve as an alert for the need of recognition of cyanotoxins as a new health risk factor in the country. Therefore, permanent monitoring with identification of toxins in water bodies at risk and activities for limitation and control of toxic blooms are urgently needed, in combination with increase of the attention to the effects of cyanotoxins on both human health and health of aquatic ecosystems in Bulgaria.

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“…Typically, deep, clear and oligotrophic/mesotrophic lakes contain mainly phycoerythrin (PE) rich cells while in shallow, turbid (humic) eutrophic lakes phycocyanin (PC) rich cells predominate (Callieri and Stockner, 2002). The success of Synechococcus in oligotrophic systems is explained by its capacity for adaptation to low-light conditions (Callieri et al, 2012). Their affinity to orthophosphate and other organic phosphorous sources apart from inorganic phosphates and their capacity for nitrogen storage in phycobilins (Camacho, 2006) enhance Synechococcus competition against algae and other bacteria (Vadstein, 2000).…”

Section: Introductionmentioning

confidence: 99%

Novel Synechococcus Genomes Reconstructed from Freshwater Reservoirs

et al. 2017

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Freshwater picocyanobacteria including Synechococcus remain poorly studied at the genomic level, compared to their marine representatives. Here, using a metagenomic assembly approach we discovered two novel Synechococcus sp. genomes from two freshwater reservoirs Tous and Lake Lanier, both sharing 96% average nucleotide identity and displaying high abundance levels in these two lakes located at similar altitudes and temperate latitudes. These new genomes have the smallest estimated size (2.2 Mb) and average intergenic spacer length (20 bp) of any previously sequenced freshwater Synechococcus, which may contribute to their success in oligotrophic freshwater systems. Fluorescent in situ hybridization confirmed that Synechococcus sp. Tous comprises small cells (0.987 ± 0.139 μm length, 0.723 ± 0.119 μm width) that amount to 90% of the picocyanobacteria in Tous. They appear together in a phylogenomic tree with Synechococcus sp. RCC307 strain, the main representative of sub-cluster 5.3 that has itself one of the smallest marine Synechococcus genomes. We detected a type II phycobilisome (PBS) gene cluster in both genomes, which suggests that they belong to a phycoerythrin-rich pink low-light ecotype. The decrease of acidic proteins and the higher content of basic transporters and membrane proteins in the novel Synechococcus genomes, compared to marine representatives, support their freshwater specialization. A sulfate Cys transporter which is absent in marine but has been identified in many freshwater cyanobacteria was also detected in Synechococcus sp. Tous. The RuBisCo subunits from this microbe are phylogenetically close to the freshwater amoeba Paulinella chromatophora symbiont, hinting to a freshwater origin of the carboxysome operon of this protist. The novel genomes enlarge the known diversity of freshwater Synechococcus and improve the overall knowledge of the relationships among members of this genus at large.

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Freshwater Picocyanobacteria: Single Cells, Microcolonies and Colonial Forms

Cited by 73 publications

References 264 publications

Micro-players for macro-roles: aquatic microbes in deep lakes

Micro-players for macro-roles: aquatic microbes in deep lakes

Assessment of cyanoprokaryote blooms and of cyanotoxins in Bulgaria in a 15-years period (2000-2015)

Novel Synechococcus Genomes Reconstructed from Freshwater Reservoirs

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