Vertical models of phototrophic bacterial distribution in the metalimnetic microbial communities of several freshwater North-American kettle lakes

Vilà, Xavier

doi:10.1016/s0168-6496(98)00010-5

Cited by 15 publications

(24 citation statements)

References 14 publications

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“…The positive correlation between NH 4 + ‐N of the porewater and the abundance of Chlorobi is consistent with the data of Edberg, Andersson, and Holmstrom () and suggests these bacteria may have participated in the transformation of NH 4 + ‐N. Additional factors affecting the presence of Chlorobi in mesotrophication regions (A‐3) may include environmental factors because Chlorobi are photosynthetic bacteria and hence require the presence of adequate light penetration in water (Vila, Abella, Figueras, & Hurley, ). On the contrary, Region A‐3 is teemed with a great many submersed vegetation or aquatic plants.…”

Section: Discussionsupporting

confidence: 83%

Illumina sequencing‐based analysis of sediment bacteria community in different trophic status freshwater lakes

et al. 2017

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Sediment bacterial community is the main driving force for nutrient cycling and energy transfer in aquatic ecosystem. A thorough understanding of the community's spatiotemporal variation is critical for us to understand the mechanisms of cycling and transfer. Here, we investigated the sediment bacterial community structures and their relations with environmental factors, using Lake Taihu as a model system to explore the dependence of biodiversity upon trophic level and seasonality. To combat the limitations of conventional techniques, we employed Illumina MiSeq Sequencing and LeFSe cladogram to obtain a more comprehensive view of the bacterial taxonomy and their variations of spatiotemporal distribution. The results uncovered a 1,000‐fold increase in the total amount of sequences harvested and a reverse relationship between trophic level and the bacterial diversity in most seasons of a year. A total of 65 phyla, 221 classes, 436 orders, 624 families, and 864 genera were identified in the study area. Delta‐proteobacteria and gamma‐proteobacteria prevailed in spring/summer and winter, respectively, regardless trophic conditions; meanwhile, the two classes dominated in the eutrophication and mesotrophication lake regions, respectively, but exclusively in the Fall. For LEfSe analysis, bacterial taxon that showed the strongest seasonal or spatial variation, majority had the highest abundance in spring/summer or medium eutrophication region, respectively. Pearson's correlation analysis indicated that 5 major phyla and 18 sub‐phylogenetic groups showed significant correlation with trophic status. Canonical correspondence analysis further revealed that porewater NH 4 +‐N as well as sediment TOM and NO x‐N are likely the dominant environmental factors affecting bacterial community compositions.

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Section: Discussionsupporting

confidence: 83%

Illumina sequencing‐based analysis of sediment bacteria community in different trophic status freshwater lakes

et al. 2017

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“…in June, August and October). At these times, they were distributed over the whole chemocline and thus encountered in a light intensity range from high to low and, similar to reports for other meromictic lakes [38], they were present at the same depths as purple sulfur bacteria. Populations of purple sulfur bacteria, however, were microstratified under these conditions.…”

Section: Discussionsupporting

confidence: 84%

“…In addition to other physico‐chemical conditions such as higher redox potential, higher oxygen or sulfide concentrations reported to favor growth of purple sulfur bacteria over that of certain green sulfur bacteria [38,43], metabolic properties might give purple sulfur bacteria growth advantages over green sulfur bacteria. Small‐celled purple sulfur bacteria in the chemocline of Lake Cadagno form large cell aggregates with up to 900 cells and are associated with sulfate‐reducing bacteria related to the genus Desulfocapsa [18].…”

Section: Discussionmentioning

confidence: 99%

Spatio-temporal distribution of phototrophic sulfur bacteria in the chemocline of meromictic Lake Cadagno (Switzerland)

Tonolla

Peduzzi

Hahn

et al. 2003

FEMS Microbiology Ecology

130

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In situ hybridization was used to study the spatio-temporal distribution of phototrophic sulfur bacteria in the permanent chemocline of meromictic Lake Cadagno, Switzerland. At all four sampling times during the year the numerically most important phototrophic sulfur bacteria in the chemocline were small-celled purple sulfur bacteria of two yet uncultured populations designated D and F. Other small-celled purple sulfur bacteria (Amoebobacter purpureus and Lamprocystis roseopersicina) were found in numbers about one order of magnitude lower. These numbers were similar to those of large-celled purple sulfur bacteria (Chromatium okenii) and green sulfur bacteria that almost entirely consisted of Chlorobium phaeobacteroides. In March and June when low light intensities reached the chemocline, cell densities of all populations, with the exception of L. roseopersicina, were about one order of magnitude lower than in August and October when light intensities were much higher. Most populations were evenly distributed throughout the whole chemocline during March and June, while in August and October a microstratification of populations was detected suggesting specific eco-physiological adaptations of different populations of phototrophic sulfur bacteria to the steep physico-chemical gradients in the chemocline of Lake Cadagno.

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“…To examine this idea and to identify similarities between Cross Reservoir and naturally occurring lakes that contain significant populations of ‘ C. aggregatum ’, we compiled a list of the basic characteristics of 12 lake systems along with important lake information such as trophic status, mixing status and sulphide and light levels at the depth of the consortia (Table 5). Studies of other lakes have revealed dense plates of ‘ C. aggregatum ’ and/or other species of PSB (Takahashi & Ichimura, 1968; Czeczuga & Gradzki, 1973; Moffett, 1991; Vila et al. , 1998), but are not included in this table because their physicochemical profiles were not fine enough to characterise the zone of the consortia, detailed bacterial identifications were not performed, or because other important lake parameters were unavailable.…”

Section: Cross Reservoir Compared With Natural Lake Systemsmentioning

confidence: 99%

“…DCM are typically comprised of locally dense, subepilimnetic communities of photosynthetic bacteria and/or algae. After years of focus on phytoplankton in DCM, a growing body of research has revealed that deep layers of both purple and green photosynthetic sulphur bacteria (PSB) may be of equal or greater importance to the lake system (Parkin & Brock, 1980; Vila et al. , 1998).…”

Section: Introductionmentioning

confidence: 99%

A deep maximum of green sulphur bacteria (‘Chlorochromatium aggregatum’) in a strongly stratified reservoir

et al. 2004

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1. Fine-scale physical and chemical gradients and deep photosynthetic microbial populations were assessed to provide an initial characterisation of a small, thermally stratified reservoir (Cross Reservoir, Kansas, U.S.A.) and its deep chlorophyll maxima (DCM). Factors were identified that may affect vertical positioning of subepilimnetic photosynthetic sulphur bacteria (PSB) in lakes. 2. Results indicate that Cross Reservoir is a mesotrophic, dimictic lake with large subepilimnetic chlorophyll maxima containing dense layers of PSB. Characteristics of the deep PSB community of Cross Reservoir strongly correlate with both light and nutrient gradients. 3. The deep bacterial community mostly contained single-celled and aggregating green sulphur bacteria, specifically free-living Chlorobium limicola and the conspicuous motile ectosymbiotic consortium known as 'Chlorochromatium aggregatum'. The bacteria were within the anaerobic hypolimnion, beneath a metalimnetic plate of Cryptomonas spp. and within very low sulphide and light conditions [mean of 67 lgS L )1 and 0.05% photosynthetically active radiation (PAR)]. Pigment concentrations and fluorescence trends indicate that the bacteria made up a larger proportion of the DCM biomass than did phytoplankton in 1996. 4. Cross Reservoir shares characteristics with natural lakes world-wide that also include a deep PSB community containing dense layers of 'C. aggregatum'. Correlation analyses indicate that PSB community positioning and density are related to light, sulphide supply, redox potentials and pH. A 2-factor principal components analysis (PCA) and other data trends supported these interpretations and indicated that PSB are sensitive to the thermal stability of the water column, are nitrogen limited and regulated more by sulphide or sulphide to light ratios than local levels of light. The sensitivity of these deep photosynthetic bacteria to environmental gradients, and their significance to some aquatic systems, demonstrate their potential as indicators of environmental disturbance.

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Vertical models of phototrophic bacterial distribution in the metalimnetic microbial communities of several freshwater North-American kettle lakes

Cited by 15 publications

References 14 publications

Illumina sequencing‐based analysis of sediment bacteria community in different trophic status freshwater lakes

Illumina sequencing‐based analysis of sediment bacteria community in different trophic status freshwater lakes

Spatio-temporal distribution of phototrophic sulfur bacteria in the chemocline of meromictic Lake Cadagno (Switzerland)

A deep maximum of green sulphur bacteria (‘Chlorochromatium aggregatum’) in a strongly stratified reservoir

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