DNA base composition of planktonic species of Anabaena (Cyanobacteria) and its taxonomic value.

Li, Ren Hui; Watanabe, Makoto M.

doi:10.2323/jgam.48.77

Cited by 8 publications

(2 citation statements)

References 9 publications

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“…However, C. raciborskii and M. aeruginosa showed reduced growth at temperatures below 20°C (M. C. S. Soares et al unpubl. ), and Li & Watanabe (2001) found that 45 of 50 strains of Anabaena had high optimal growth above 20°C. In Funil Reservoir, the monthly average temperature during the coldest months is around 13°C, when daily temperatures easily reach values close to 11°C.…”

Section: Cyanobacterial Occurrence and Seasonal Successionmentioning

confidence: 99%

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Soares¹,

Rocha²,

Marinho³

et al. 2009

Aquat. Microb. Ecol.

111

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Trends in recent years have indicated that cyanobacterial blooms in tropical reservoirs are increasing in frequency, magnitude and geographical distribution. Funil Reservoir in southeastern Brazil has experienced eutrophication in the recent decades, resulting in lasting and intense toxic cyanobacterial blooms. As input of nutrients is high during the year, the aim of the present study was to evaluate the role of other variables related to changes in cyanobacterial biomass and composition. The dominant group found over the entire study period was Cyanobacteria (97% of total biomass), which contributed to low diversity. A shift of nitrogen-fixing (Anabaena circinalis and Cylindrospermopsis raciborskii) and non nitrogen-fixing (Microcystis aeruginosa) cyanobacteria was observed. Redundancy analysis indicated that physical factors such as temperature, changes in the mixing zone and light intensity were the main driving factors of the seasonal succession. Nitrogenfixing cyanobacteria dominated in periods of low light in the deepest mixing zone, and also seemed to have experienced stronger grazing effects as the density of the large zooplankton group was related to cyanobacteria biomass. M. aeruginosa bloomed in warm stratified waters, high water levels and during months with more daylight, when the zooplankton density was drastically reduced. Although the long-standing dominance of cyanobacteria may be related to high nutrient availability, the present study showed that under high and constant input of nutrients, other factors, especially physical variables, present a more plausible explanation to promote changes in species composition.KEY WORDS: Cyanobacterial bloom · Cylindrospermopsis · Microcystis · Anabaena · Zooplankton Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 57: [137][138][139][140][141][142][143][144][145][146][147][148][149] 2009 reports of surface scum have become much more numerous since the mid-20th century. Harmful algal blooms caused by cyanobacteria (CyanoHABs) are one of the most severe problems in freshwater ecosystems nowadays. These often-toxic blooms and the dense surface scums are indicative of water quality deterioration and food-web changes, and can be responsible for the mortality of fish, domestic animals and even humans (Paerl & Huisman 2009).Cyanobacteria blooms occur in waters during calm stratified conditions with high temperatures and adequate nutrient supplies (Huszar et al. 2000). Cyanobacterial dominance is mostly related to favourable bottom-up factors (Briand et al. 2002, Marinho & Huszar 2002, since they are widely known for their ability to minimize grazing pressure, through different effects on zooplankton community: mechanical interference (difficulty in manipulating and ingesting large colonies or filaments), assimilation (low amounts of essential nutrients) and toxicity (De Bernardi & Giussani 1990). However, some zooplankton species have developed physiological resistance to cyanotoxins (Fulton & Paerl 1988...

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Section: Cyanobacterial Occurrence and Seasonal Successionmentioning

confidence: 99%

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Soares¹,

Rocha²,

Marinho³

et al. 2009

Aquat. Microb. Ecol.

111

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“…In our study, Nostocales and Stigonematales were the most abundant diazotrophs in fractions #10, #11, and #12 (Fig. 4), and these have a lower G + C content than those of proteobacterial diazotrophs (Li and Watanabe 2002). The high 15 N-enrichment of soil DNA of these fractions indicated that they were unlikely to absorb 15 N from other diazotrophs.…”

Section: The Combination Of Nanosims and 15 N 2 -Dna-sipmentioning

confidence: 58%

Unveiling of active diazotrophs in a flooded rice soil by combination of NanoSIMS and 15N2-DNA-stable isotope probing

et al. 2020

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The biological nitrogen fixation in planted and nonplanted paddy soils was quantified using a chamber-based 15 N 2 -labeling technique, and the active diazotrophs of soil were assessed by 15 N 2 -DNA-stable isotope probing (SIP). In addition, the nanometer scale secondary ion mass spectrometry (NanoSIMS) was applied to analysis the 15 N-enrichment of soil DNA in SIP fractions.15 N 2 -labeling experiment showed that BNF was 11.33 ± 1.90 kg N ha −1 in the rice-planted soil and 3.55 ± 1.18 kg N ha −1 in the nonplanted soil after 28-day labeling. The biologically fixed 15 N was mainly (> 95%) recovered in the surface layer (0-0.5 cm) in the rice-planted soil. High throughput sequencing of nifH genes extracted from surface soil showed that the presence of rice affected the community composition of diazotrophs. The relative abundance of Nostocales and Stigonematales was significantly higher in rice-planted soil than in nonplanted soil (P < 0.05). After CsCl gradient ultracentrifugation, NanoSIMS images clearly showed that 15 N was incorporated into soil DNA in the 15 N 2 -labeling SIP gradient fractions. Analyses of nifH genes in 15 Nenriched SIP gradient fractions suggested that Nostocales and Stigonematales were the major contributors to BNF in the rice-soil system. Taken together, these results have highlighted the contributions of cyanobacteria to the BNF in paddy fields and improved our understanding of the close relationship between rice plants and cyanobacteria.

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Evolution of Phycobiliproteins

Kannaujiya

Sundaram

Sinha

2017

Phycobiliproteins: Recent Developments and Future Applications

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DNA base composition of planktonic species of Anabaena (Cyanobacteria) and its taxonomic value.

Cited by 8 publications

References 9 publications

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Changes in species composition during annual cyanobacterial dominance in a tropical reservoir: physical factors, nutrients and grazing effects

Unveiling of active diazotrophs in a flooded rice soil by combination of NanoSIMS and 15N2-DNA-stable isotope probing

Evolution of Phycobiliproteins

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