101
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Simonis JL, Neuharth-Keusch D, Hewson I. Aquatic bacterial assemblage variability in the supra littoral zone of Appledore Island, Gulf of Maine. FEMS Microbiol Ecol 2012; 80:501-8. [PMID: 22283228 DOI: 10.1111/j.1574-6941.2012.01318.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Revised: 12/20/2011] [Accepted: 01/19/2012] [Indexed: 11/28/2022] Open
Abstract
We investigated the abundance and assemblage variability of bacteria in 10 spatially distinct freshwater pools on Appledore Island, Gulf of Maine. Assemblages were strongly heterogeneous between pools separated by even short distances. To gain insight into factors that may lead to the establishment of novel assemblages, we conducted an ecosystem-open choromophoric dissolved organic matter (CDOM) enrichment experiment within mesocosms inoculated with a standardized microbial community and observed patterns of their composition over time. Assemblages were strongly divergent from each other in composition after only 3 days of incubation. Divergence among mesocosms was significantly higher with increasing levels of CDOM. CDOM addition initially had a strong positive impact on bacterial operation taxonomic unit (OTU) richness and negative impact on bacterial OTU evenness, but no impact on total bacterial abundance, suggesting that factors controlling abundance are decoupled from those influencing overall composition.
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Affiliation(s)
- Joseph L Simonis
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA
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102
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Makhdoumi-Kakhki A, Amoozegar MA, Kazemi B, Pašić L, Ventosa A. Prokaryotic diversity in Aran-Bidgol salt lake, the largest hypersaline playa in Iran. Microbes Environ 2011; 27:87-93. [PMID: 22185719 PMCID: PMC4036037 DOI: 10.1264/jsme2.me11267] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Prokaryotic diversity in Aran-Bidgol salt lake, a thalasohaline lake in Iran, was studied by fluorescence in situ hybridization (FISH), cultivation techniques, denaturing gradient gel electrophoresis (DGGE) of PCR-amplified fragments of 16S rRNA genes and 16S rRNA gene clone library analysis. Viable counts obtained (2.5-4 × 10(6) cells mL(-1)) were similar to total cell abundance in the lake determined by DAPI direct count (3-4×10(7) cells mL(-1)). The proportion of Bacteria to Archaea in the community detectable by FISH was unexpectedly high and ranged between 1:3 and 1:2. We analyzed 101 archaeal isolates and found that most belonged to the genera Halorubrum (55%) and Haloarcula (18%). Eleven bacterial isolates obtained in pure culture were affiliated with the genera Salinibacter (18.7%), Salicola (18.7%) and Rhodovibrio (35.3%). Analysis of inserts of 100 clones from the eight 16S rRNA clone libraries constructed revealed 37 OTUs. The majority (63%) of these sequences were not related to any previously identified taxa. Within this sampling effort we most frequently retrieved phylotypes related to Halorhabdus (16% of archaeal sequences obtained) and Salinibacter (36% of bacterial sequences obtained). Other prokaryotic groups that were abundant included representatives of Haloquadratum, the anaerobic genera Halanaerobium and Halocella, purple sulfur bacteria of the genus Halorhodospira and Cyanobacteria.
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Affiliation(s)
- Ali Makhdoumi-Kakhki
- Extremophile Laboratory, Department of Microbiology, School of Biology, College of Science, University of Tehran, Tehran, Iran
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103
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16s rDNA based microbial diversity analysis of eleven acid mine drainages obtained from three Chinese copper mines. ACTA ACUST UNITED AC 2011. [DOI: 10.1007/s11771-011-0925-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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104
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Tourova TP, Kovaleva OL, Bumazhkin BK, Patutina EO, Kuznetsov BB, Bryantseva IA, Gorlenko VM, Sorokin DY. Application of ribulose-1,5-bisphosphate carboxylase/oxygenase genes as molecular markers for assessment of the diversity of autotrophic microbial communities inhabiting the upper sediment horizons of the saline and soda lakes of the Kulunda Steppe. Microbiology (Reading) 2011. [DOI: 10.1134/s0026261711060221] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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105
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Lentini V, Gugliandolo C, Maugeri TL. Vertical distribution of Archaea and Bacteria in a meromictic lake as determined by fluorescent in situ hybridization. Curr Microbiol 2011; 64:66-74. [PMID: 22006072 DOI: 10.1007/s00284-011-0028-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 09/29/2011] [Indexed: 11/28/2022]
Abstract
The prokaryotic cells distribution in the water column of the coastal saline meromictic Lake Faro (Messina, Italy) was investigated by microscopic counting techniques. Water samples were collected at a central station from the surface to the bottom, when waters were characterized by a marked stratification. A "red-water" layer, caused by a dense growth of photosynthetic sulfur bacteria, was present at a depth of 15 m, defining a transition area between oxic (mixolimnion) and anoxic (monimolimnion) layers. Fluorescently labeled 16S rRNA oligonucleotide, group-specific probes were used to determine the abundance of Bacteria and Archaea, and their subgroups, Green Sulfur Bacteria (GSB), Sulfate Reducing Bacteria (SRB), Cyanobacteria and Chromatium okenii, and Crenarchaeota and Euryarchaeota, as key elements of the microbial community. Bacteria decreased from surface to bottom, while Archaea increased with depth and reached the maximum value at 30 m, where they outnumbered the Bacteria. Bacteria and picophytoplankton prevailed in the mixolimnion. At the chemocline high numbers of prokaryotic cells were present, mainly represented by Cyanobacteria, Chromatium okenii and Euryarchaeota. GSB, SRB, and Crenarchaeota prevailed below the chemocline. Although Archaea constitute a minor fraction of microbial community, they could represent active contributors to the meromictic Lake Faro ecosystem.
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Affiliation(s)
- Valeria Lentini
- Dipartimento di Biologia Animale ed Ecologia Marina, Sezione di Ecologia Microbica e Biotecnologie, Università di Messina, Sant'Agata, Italy.
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106
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Lymperopoulou DS, Kormas KA, Karagouni AD. Variability of prokaryotic community structure in a drinking water reservoir (Marathonas, Greece). Microbes Environ 2011; 27:1-8. [PMID: 21971081 PMCID: PMC4036031 DOI: 10.1264/jsme2.me11253] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The structure of the Bacteria and Archaea community in a large drinking water reservoir (Marathonas, Greece; MR) was investigated in October 2007 and September 2008, using 16S rRNA gene clone libraries. The bacterial communities were more diverse than archaeal communities (Shannon diversity index H′ 0.81–3.28 and 1.36–1.77, respectively). The overall bacterial community composition was comparable to bacterioplankton community described in other freshwater habitats. Within the Bacteria, Betaproteobacteria dominated, while representatives of Alpha-, Gamma- and Deltaproteobacteria also occurred. Other important phyla were Actinobacteria and Bacteroidetes, while representatives of Acidobacteria, Cyanobacteria, Chloroflexi, Planctomycetes and Verrucomicrobia were also retrieved. Several phylotypes in Alpha- and Betaproteobacteria and Bacteroidetes were related to bacteria capable of cyanotoxin degradation and with aromatic compounds/iron oxidizers or polymer degraders. Euryarchaeota dominated (60.5%) the Archaea community mostly with phylotypes related to Methanobacteriales and Methanosarcinales. Among the Thaumarchaeota, the two most abundant phylotypes were affiliated (97% similarity) with the only cultivated mesophilic thaumarchaeote of marine origin, Nitrosopumilus maritimus. Temporal and spatial comparison of the prokaryotic community structure revealed that three of the most abundant prokaryotic phylotypes, belonging to Actinobacteria, were recovered from all sites both years, suggesting that these Actinobacteria could be important key players in MR ecosystem functioning.
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Affiliation(s)
- Despoina S Lymperopoulou
- National and Kapodistrian University of Athens, Faculty of Biology, Department of Botany, Microbiology Group, Athens, Greece.
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107
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Prokaryotic diversity, composition structure, and phylogenetic analysis of microbial communities in leachate sediment ecosystems. Appl Microbiol Biotechnol 2011; 91:1659-75. [DOI: 10.1007/s00253-011-3354-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Revised: 04/20/2011] [Accepted: 04/20/2011] [Indexed: 10/18/2022]
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108
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Mohanty SR, Kollah B, Brodie EL, Hazen TC, Roden EE. 16S rRNA gene microarray analysis of microbial communities in ethanol-stimulated subsurface sediment. Microbes Environ 2011; 26:261-5. [PMID: 21558677 DOI: 10.1264/jsme2.me11111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A high-density 16S rRNA gene microarray was used to analyze microbial communities in a slurry of ethanol-amended, uranium-contaminated subsurface sediment. Of specific interest was the extent to which the microarray could detect temporal patterns in the relative abundance of major metabolic groups (nitrate-reducing, metal-reducing, sulfate-reducing, and methanogenic taxa) that were stimulated by ethanol addition. The results show that the microarray, when used in conjunction with geochemical data and knowledge of the physiological properties of relevant taxa, provided accurate assessment of the response of key functional groups to biostimulation.
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Affiliation(s)
- Santosh R Mohanty
- Department of Geoscience, University of Wisconsin, Madison, 1215 W. Dayton St., WI 53706, USA
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109
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Sorokin DY, Kuenen JG, Muyzer G. The microbial sulfur cycle at extremely haloalkaline conditions of soda lakes. Front Microbiol 2011; 2:44. [PMID: 21747784 PMCID: PMC3128939 DOI: 10.3389/fmicb.2011.00044] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Accepted: 02/25/2011] [Indexed: 11/13/2022] Open
Abstract
Soda lakes represent a unique ecosystem with extremely high pH (up to 11) and salinity (up to saturation) due to the presence of high concentrations of sodium carbonate in brines. Despite these double extreme conditions, most of the lakes are highly productive and contain a fully functional microbial system. The microbial sulfur cycle is among the most active in soda lakes. One of the explanations for that is high-energy efficiency of dissimilatory conversions of inorganic sulfur compounds, both oxidative and reductive, sufficient to cope with costly life at double extreme conditions. The oxidative part of the sulfur cycle is driven by chemolithoautotrophic haloalkaliphilic sulfur-oxidizing bacteria (SOB), which are unique for soda lakes. The haloalkaliphilic SOB are present in the surface sediment layer of various soda lakes at high numbers of up to 10(6) viable cells/cm(3). The culturable forms are so far represented by four novel genera within the Gammaproteobacteria, including the genera Thioalkalivibrio, Thioalkalimicrobium, Thioalkalispira, and Thioalkalibacter. The latter two were only found occasionally and each includes a single species, while the former two are widely distributed in various soda lakes over the world. The genus Thioalkalivibrio is the most physiologically diverse and covers the whole spectrum of salt/pH conditions present in soda lakes. Most importantly, the dominant subgroup of this genus is able to grow in saturated soda brines containing 4 M total Na(+) - a so far unique property for any known aerobic chemolithoautotroph. Furthermore, some species can use thiocyanate as a sole energy source and three out of nine species can grow anaerobically with nitrogen oxides as electron acceptor. The reductive part of the sulfur cycle is active in the anoxic layers of the sediments of soda lakes. The in situ measurements of sulfate reduction rates and laboratory experiments with sediment slurries using sulfate, thiosulfate, or elemental sulfur as electron acceptors demonstrated relatively high sulfate reduction rates only hampered by salt-saturated conditions. However, the highest rates of sulfidogenesis were observed not with sulfate, but with elemental sulfur followed by thiosulfate. Formate, but not hydrogen, was the most efficient electron donor with all three sulfur electron acceptors, while acetate was only utilized as an electron donor under sulfur-reducing conditions. The native sulfidogenic populations of soda lakes showed a typical obligately alkaliphilic pH response, which corresponded well to the in situ pH conditions. Microbiological analysis indicated a domination of three groups of haloalkaliphilic autotrophic sulfate-reducing bacteria belonging to the order Desulfovibrionales (genera Desulfonatronovibrio, Desulfonatronum, and Desulfonatronospira) with a clear tendency to grow by thiosulfate disproportionation in the absence of external electron donor even at salt-saturating conditions. Few novel representatives of the order Desulfobacterales capable of heterotrophic growth with volatile fatty acids and alcohols at high pH and moderate salinity have also been found, while acetate oxidation was a function of a specialized group of haloalkaliphilic sulfur-reducing bacteria, which belong to the phylum Chrysiogenetes.
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Affiliation(s)
- Dimitry Y Sorokin
- Winogradsky Institute of Microbiology, Russian Academy of Sciences Moscow, Russia
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110
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Barberán A, Casamayor EO. Euxinic freshwater hypolimnia promote bacterial endemicity in continental areas. MICROBIAL ECOLOGY 2011; 61:465-472. [PMID: 21107832 DOI: 10.1007/s00248-010-9775-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2010] [Accepted: 11/05/2010] [Indexed: 05/30/2023]
Abstract
Bacteria and archaea represent the vast majority of biodiversity on Earth. The ways that dynamic ecological and evolutionary processes interact in the microbial world are, however, poorly known. Here, we have explored community patterns of planktonic freshwater bacteria inhabiting stratified lakes with oxic/anoxic interfaces and euxinic (anoxic and sulfurous) water masses. The interface separates a well-oxygenated upper water mass (epilimnion) from a lower anoxic water compartment (hypolimnion). We assessed whether or not the vertical zonation of lakes promoted endemism in deeper layers by analyzing bacterial 16S rRNA gene sequences from the water column of worldwide distributed stratified lakes and applying a community ecology approach. Community similarity based on the phylogenetic relatedness showed that bacterial assemblages from the same water layer were more similar across lakes than to communities from different layer within lakes and that anoxic hypolimnia presented greater β-diversity than oxic epilimnia. Higher β-diversity values are attributable to low dispersal and small connectivity between community patches. In addition, surface waters had significant spatial but non-significant environmental components controlling phylogenetic β-diversity patterns, respectively. Conversely, the bottom layers were significantly correlated with environment but not with geographic distance. Thus, we observed different ecological mechanisms simultaneously acting on the same water body. Overall, bacterial endemicity is probably more common than previously thought, particularly in isolated and environmentally heterogeneous freshwater habitats. We argue for a microbial diversity conservation perspective still lacking in the global and local biodiversity preservation policies.
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Affiliation(s)
- Albert Barberán
- Department of Continental Ecology-Limnology, Centre d'Estudis Avançats de Blanes, CSIC, Accés Cala St. Francesc 14, 17300 Blanes, Spain
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111
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Brum JR, Steward GF. Morphological characterization of viruses in the stratified water column of alkaline, hypersaline Mono Lake. MICROBIAL ECOLOGY 2010; 60:636-43. [PMID: 20521038 DOI: 10.1007/s00248-010-9688-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2009] [Accepted: 05/06/2010] [Indexed: 05/25/2023]
Abstract
Concentrations of viruses and prokaryotes in the alkaline, moderately hypersaline, seasonally stratified Mono Lake are among the highest reported for a natural aquatic environment. We used electron microscopy to test whether viral morphological characteristics differed among the epilimnion, metalimnion, and the anoxic hypolimnion of the lake and to determine how the properties of viruses in Mono Lake compare to other aquatic environments. Viral capsid size distributions were more similar in the metalimnion and hypolimnion of Mono Lake, while viral tail lengths were more similar in the epilimnion and metalimnion. The percentage of tailed viruses decreased with depth and the relative percentages of tailed phage families changed with depth. The presence of large (>125 nm capsid), untailed viruses in the metalimnion and hypolimnion suggests that eukaryotic viruses are produced in these suboxic and anoxic, hypersaline environments. Capsid diameters of viruses were larger on average in Mono Lake compared to other aquatic environments, and no lemon-shaped or filamentous viruses were found, in contrast to other high-salinity or high-altitude lakes and seas. Our data suggest that the physically and chemically distinct layers of Mono Lake harbor different viral assemblages, and that these assemblages are distinct from other aquatic environments that have been studied. Furthermore, we found that filtration of a sample through a 0.22-µm pore-size filter significantly altered the distribution of viral capsid diameters and tail lengths, resulting in a relative depletion of viruses having larger capsids and longer tails. This observation highlights the potential for bias in molecular surveys of viral diversity, which typically rely on filtration through 0.2- or 0.22-µm pore-size membrane filters to remove bacteria during sample preparation.
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Affiliation(s)
- Jennifer R Brum
- Department of Oceanography, University of Hawai'i at Manoa, 1000 Pope Rd., MSB 205, Honolulu, HI 96822, USA.
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112
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Mayumi D, Mochimaru H, Yoshioka H, Sakata S, Maeda H, Miyagawa Y, Ikarashi M, Takeuchi M, Kamagata Y. Evidence for syntrophic acetate oxidation coupled to hydrogenotrophic methanogenesis in the high-temperature petroleum reservoir of Yabase oil field (Japan). Environ Microbiol 2010; 13:1995-2006. [DOI: 10.1111/j.1462-2920.2010.02338.x] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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113
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Wu CH, Sercu B, Van De Werfhorst LC, Wong J, DeSantis TZ, Brodie EL, Hazen TC, Holden PA, Andersen GL. Characterization of coastal urban watershed bacterial communities leads to alternative community-based indicators. PLoS One 2010; 5:e11285. [PMID: 20585654 PMCID: PMC2890573 DOI: 10.1371/journal.pone.0011285] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Accepted: 05/01/2010] [Indexed: 02/01/2023] Open
Abstract
Background Microbial communities in aquatic environments are spatially and temporally dynamic due to environmental fluctuations and varied external input sources. A large percentage of the urban watersheds in the United States are affected by fecal pollution, including human pathogens, thus warranting comprehensive monitoring. Methodology/Principal Findings Using a high-density microarray (PhyloChip), we examined water column bacterial community DNA extracted from two connecting urban watersheds, elucidating variable and stable bacterial subpopulations over a 3-day period and community composition profiles that were distinct to fecal and non-fecal sources. Two approaches were used for indication of fecal influence. The first approach utilized similarity of 503 operational taxonomic units (OTUs) common to all fecal samples analyzed in this study with the watershed samples as an index of fecal pollution. A majority of the 503 OTUs were found in the phyla Firmicutes, Proteobacteria, Bacteroidetes, and Actinobacteria. The second approach incorporated relative richness of 4 bacterial classes (Bacilli, Bacteroidetes, Clostridia and α-proteobacteria) found to have the highest variance in fecal and non-fecal samples. The ratio of these 4 classes (BBC∶A) from the watershed samples demonstrated a trend where bacterial communities from gut and sewage sources had higher ratios than from sources not impacted by fecal material. This trend was also observed in the 124 bacterial communities from previously published and unpublished sequencing or PhyloChip- analyzed studies. Conclusions/Significance This study provided a detailed characterization of bacterial community variability during dry weather across a 3-day period in two urban watersheds. The comparative analysis of watershed community composition resulted in alternative community-based indicators that could be useful for assessing ecosystem health.
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Affiliation(s)
- Cindy H. Wu
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Bram Sercu
- Donald Bren of School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Laurie C. Van De Werfhorst
- Donald Bren of School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Jakk Wong
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Todd Z. DeSantis
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Eoin L. Brodie
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Terry C. Hazen
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Patricia A. Holden
- Donald Bren of School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, California, United States of America
| | - Gary L. Andersen
- Ecology Department, Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
- * E-mail:
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114
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Distribution and Diversity of Bacteria in a Saline Meromictic Lake as Determined by PCR-DGGE of 16S rRNA Gene Fragments. Curr Microbiol 2010; 62:159-66. [DOI: 10.1007/s00284-010-9688-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Accepted: 05/26/2010] [Indexed: 11/30/2022]
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115
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Gorlenko VM, Buryukhaev SP, Matyugina EB, Borzenko SV, Namsaraev ZB, Bryantseva IA, Boldareva EN, Sorokin DY, Namsaraev BB. Microbial communities of the stratified soda Lake Doroninskoe (Transbaikal region). Microbiology (Reading) 2010. [DOI: 10.1134/s0026261710030161] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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116
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Sorokin DY, Rusanov II, Pimenov NV, Tourova TP, Abbas B, Muyzer G. Sulfidogenesis under extremely haloalkaline conditions in soda lakes of Kulunda Steppe (Altai, Russia). FEMS Microbiol Ecol 2010; 73:278-90. [PMID: 20500526 DOI: 10.1111/j.1574-6941.2010.00901.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Sulfidogenic activity (SA) in anoxic sediments of several soda lakes with variable salinity in south Kulunda Steppe (Altai, Russia) has been investigated. The study included in situ measurements of sulfate reduction rates and laboratory experiments with sediment slurries in which sulfate, thiosulfate or elemental sulfur were used as electron acceptors. Despite the extreme conditions (high salt concentrations and high pH), the SA values were relatively high (ranging from 0.02 to 1.20 micromol HS(-) cm(-3) h(-1)), and only hampered under salt-saturated conditions. The highest SA was observed with elemental sulfur, followed by thiosulfate, while the lowest SA was determined in the presence of sulfate. Of all the electron donors tested, the addition of formate resulted in the highest SA with all three sulfur electron acceptors. Surprisingly, hydrogen as an electron donor had very little effect. Acetate was utilized as an electron donor only under sulfur-reducing conditions. Indigenous populations of sulfidogens in soda lake sediments showed an obligately alkaliphilic pH response of SA, showing a pattern that corresponded well to the in situ pH conditions. Sulfate reduction was much more susceptible to salt inhibition than thiosulfate and sulfur reduction. Microbiological investigations indicated that sulfate-reducing bacteria belonging to the orders Desulfovibrionales and Desulfobacterales could very likely be responsible for the SA with sulfate and thiosulfate as electron acceptors at moderate salt concentrations. Sulfur reduction at moderate salinity was carried out by a specialized group of haloalkaliphilic sulfur-reducing bacteria that utilize volatile fatty acids. In saturated soda brine, extremely natronophilic representatives of the order Halanaerobiales were responsible for the sulfur-dependent respiration.
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Affiliation(s)
- Dimitry Y Sorokin
- Winogradsky Institute of Microbiology, Russian Academy of Sciences, Moscow, Russia.
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117
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Hollister EB, Engledow AS, Hammett AJM, Provin TL, Wilkinson HH, Gentry TJ. Shifts in microbial community structure along an ecological gradient of hypersaline soils and sediments. ISME JOURNAL 2010; 4:829-38. [DOI: 10.1038/ismej.2010.3] [Citation(s) in RCA: 228] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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118
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Visscher PT, Dupraz C, Braissant O, Gallagher KL, Glunk C, Casillas L, Reed RES. Biogeochemistry of Carbon Cycling in Hypersaline Mats: Linking the Present to the Past through Biosignatures. CELLULAR ORIGIN, LIFE IN EXTREME HABITATS AND ASTROBIOLOGY 2010. [DOI: 10.1007/978-90-481-3799-2_23] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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119
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Mormile MR, Hong BY, Benison KC. Molecular analysis of the microbial communities of Mars analog lakes in Western Australia. ASTROBIOLOGY 2009; 9:919-30. [PMID: 20041745 DOI: 10.1089/ast.2008.0293] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Unique, shallow interdune lakes and groundwaters with extremely low pH and high salinity exist in Australia, along with nearby lakes that possess higher pH values. These acidic hypersaline environments are possibly the best modern terrestrial analogues for past martian environments. However, no previous microbiological analyses of these lakes have been conducted. During the Australian winter of 2005, water samples were taken from several hypersaline lakes located in southern Western Australia that possessed acidic to slightly alkaline pH. These samples were subjected to molecular analysis to identify bacterial communities. DNA extraction and polymerase chain reaction (PCR) amplification of the 16S rRNA gene sequences, by using universal bacterial primers, were also performed on the samples. Extracted DNA was amplified with 1070 forward and 1392 GC-clamped reverse primers and analyzed by using denaturant gradient gel electrophoresis (DGGE). In addition, libraries were developed from DNA retrieved from four lakes, including a marginal marine neutral lake, an inland neutral lake, and two inland acid lakes, and selected clones with distinct operational taxonomic units were sequenced. The DGGE profiles and clone sequence data indicate that there are distinct, abundant, and diverse microbial populations in these Australian hypersaline environments, especially the acidic ones. These results are significant for two reasons: (1) they provide the first microbiological survey of natural acid saline lakes and (2) they hint at the possibility that there could have been a diverse microbial population in acidic hypersaline environments on Mars.
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Affiliation(s)
- Melanie R Mormile
- Department of Biological Sciences, Missouri University of Science and Technology, Rolla, Missouri 65409-1120, USA.
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120
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Schmidtova J, Hallam SJ, Baldwin SA. Phylogenetic diversity of transition and anoxic zone bacterial communities within a near-shore anoxic basin: Nitinat Lake. Environ Microbiol 2009; 11:3233-51. [DOI: 10.1111/j.1462-2920.2009.02044.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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121
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Philosof A, Sabehi G, Béjà O. Comparative analyses of actinobacterial genomic fragments from Lake Kinneret. Environ Microbiol 2009; 11:3189-200. [DOI: 10.1111/j.1462-2920.2009.02024.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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122
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Cabrol NA, Grin EA, Chong G, Minkley E, Hock AN, Yu Y, Bebout L, Fleming E, Häder DP, Demergasso C, Gibson J, Escudero L, Dorador C, Lim D, Woosley C, Morris RL, Tambley C, Gaete V, Galvez ME, Smith E, Uskin-Peate I, Salazar C, Dawidowicz G, Majerowicz J. The High-Lakes Project. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jg000818] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nathalie A. Cabrol
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
- SETI Carl Sagan Center; Mountain View California USA
| | - Edmond A. Grin
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
- SETI Carl Sagan Center; Mountain View California USA
| | - Guillermo Chong
- Centro de Investigación Científica y Tecnológica para Minería; Santiago Chile
| | - Edwin Minkley
- Department of Biological Sciences; Carnegie Mellon University; Pittsburgh Pennsylvania USA
| | - Andrew N. Hock
- Department of Earth and Space Sciences; University of California; Los Angeles California USA
| | - Youngseob Yu
- Department of Civil and Environmental Engineering; Carnegie Mellon University; Pittsburgh Pennsylvania USA
| | - Leslie Bebout
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
| | - Erich Fleming
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
| | - Donat P. Häder
- Department Botanik; University of Erlangen; Erlangen Germany
| | - Cecilia Demergasso
- Centro de Biotecnología; Universidad Católica del Norte; Antofagasta Chile
| | - John Gibson
- Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute; University of Tasmania; Hobart, Tasmania Australia
| | - Lorena Escudero
- Centro de Investigación Científica y Tecnológica para Minería; Santiago Chile
| | - Cristina Dorador
- Centro de Biotecnología; Universidad Católica del Norte; Antofagasta Chile
| | - Darlene Lim
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
- SETI Carl Sagan Center; Mountain View California USA
| | - Clayton Woosley
- Space Science and Astrobiology Division; NASA Ames Research Center; Moffett Field California USA
- SETI Carl Sagan Center; Mountain View California USA
| | | | | | - Victor Gaete
- Departamento de Química; Universidad Católica del Norte; Antofagasta Chile
| | | | - Eric Smith
- Discoverer Ketty Lund Exploration Vessel; Key West Florida USA
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123
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Low taxon richness of bacterioplankton in high-altitude lakes of the eastern tibetan plateau, with a predominance of Bacteroidetes and Synechococcus spp. Appl Environ Microbiol 2009; 75:7017-25. [PMID: 19767472 DOI: 10.1128/aem.01544-09] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Plankton samples were collected from six remote freshwater and saline lakes located at altitudes of 3,204 to 4,718 m and 1,000 km apart within an area of ca. 1 million km(2) on the eastern Tibetan Plateau to comparatively assess how environmental factors influence the diversity of bacterial communities in high-altitude lakes. The composition of the bacterioplankton was investigated by analysis of large clone libraries of 16S rRNA genes. Comparison of bacterioplankton diversities estimated for the six Tibetan lakes with reference data previously published for lakes located at lower altitudes indicated relatively low taxon richness in the Tibetan lakes. The estimated average taxon richness in the four Tibetan freshwater lakes was only one-fifth of the average taxon richness estimated for seven low-altitude reference lakes. This cannot be explained by low coverage of communities in the Tibetan lakes by the established libraries or by differences in habitat size. Furthermore, a comparison of the taxonomic compositions of bacterioplankton across the six Tibetan lakes revealed low overlap between their community compositions. About 70.9% of the operational taxonomic units (99% similarity) were specific to single lakes, and a relatively high percentage (11%) of sequences were <95% similar to publicly deposited sequences of cultured or uncultured bacteria. This beta diversity was explained by differences in salinity between lakes rather than by distance effects. Another characteristic of the investigated lakes was the predominance of Cyanobacteria (Synechococcus) and Bacteroidetes. These features of bacterioplankton diversity may reflect specific adaptation of various lineages to the environmental conditions in these high-altitude lakes.
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Abstract
Significant concentrations of dissolved inorganic arsenic can be found in the waters of a number of lakes located in the western USA and in other water bodies around the world. These lakes are often situated in arid, volcanic terrain. The highest concentrations of arsenic occur in hypersaline, closed basin soda lakes and their remnant brines. Although arsenic is a well-known toxicant to eukaryotes and prokaryotes alike, some prokaryotes have evolved biochemical mechanisms to exploit arsenic oxyanions (i.e., arsenate and arsenite); they can use them either as an electron acceptor for anaerobic respiration (arsenate), or as an electron donor (arsenite) to support chemoautotrophic fixation of CO(2) into cell carbon. Unlike in freshwater or marine ecosystems, these processes may assume quantitative significance with respect to the carbon cycle in arsenic-rich soda lakes. For the past several years our research has focused on the occurrence and biogeochemical manifestations of these processes in Mono Lake, a particularly arsenic-rich environment. Herein we review some of our findings concerning the biogeochemical arsenic cycle in this lake, with the hope that it may broaden the understanding of the influence of microorganisms upon the speciation of arsenic in more common, less "extreme" environments, such as drinking water aquifers.
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125
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Dorador C, Meneses D, Urtuvia V, Demergasso C, Vila I, Witzel KP, Imhoff JF. Diversity ofBacteroidetesin high-altitude saline evaporitic basins in northern Chile. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jg000837] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Cristina Dorador
- Centro de Biotecnología, Universidad Católica del Norte; Antofagasta Chile
- Department of Evolutionary Genetics; Max-Planck-Institute for Evolutionary Biology; Plön Germany
- Leibniz-Institute for Marine Sciences; Kiel Germany
| | - Daniela Meneses
- Centro de Biotecnología, Universidad Católica del Norte; Antofagasta Chile
| | - Viviana Urtuvia
- Centro de Biotecnología, Universidad Católica del Norte; Antofagasta Chile
| | - Cecilia Demergasso
- Centro de Biotecnología, Universidad Católica del Norte; Antofagasta Chile
- Centro de Investigación Científica y Tecnológica para la Minería; Antofagasta Chile
| | - Irma Vila
- Departamento de Ciencias Ecológicas, Facultad de Ciencias; Universidad de Chile; Santiago Chile
- Laboratorio de Limnología, Facultad de Ciencias; Universidad de Chile; Santiago Chile
| | - Karl-Paul Witzel
- Department of Evolutionary Genetics; Max-Planck-Institute for Evolutionary Biology; Plön Germany
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126
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Microbial biogeography of six salt lakes in Inner Mongolia, China, and a salt lake in Argentina. Appl Environ Microbiol 2009; 75:5750-60. [PMID: 19648369 DOI: 10.1128/aem.00040-09] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We used cultivation-independent methods to investigate the prokaryotic biogeography of the water column in six salt lakes in Inner Mongolia, China, and a salt lake in Argentina. These lakes had different salt compositions and pH values and were at variable geographic distances, on both local and intercontinental scales, which allowed us to explore the microbial community composition within the context of both contemporary environmental conditions and geographic distance. Fourteen 16S rRNA gene clone libraries were constructed, and over 200 16S rRNA gene sequences were obtained. These sequences were used to construct biotic similarity matrices, which were used in combination with environmental similarity matrices and a distance matrix in the Mantel test to discover which factors significantly influenced biotic similarity. We showed that archaeal biogeography was influenced by contemporary environmental factors alone (Na+, CO3(2-), and HCO3(-) ion concentrations; pH; and temperature). Bacterial biogeography was influenced both by contemporary environmental factors (Na+, Mg2+, and HCO3(-) ion concentrations and pH) and by geographic distance.
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127
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Mori K, Yamaguchi K, Sakiyama Y, Urabe T, Suzuki KI. Caldisericum exile gen. nov., sp. nov., an anaerobic, thermophilic, filamentous bacterium of a novel bacterial phylum, Caldiserica phyl. nov., originally called the candidate phylum OP5, and description of Caldisericaceae fam. nov., Caldisericales ord. nov. and Caldisericia classis nov. Int J Syst Evol Microbiol 2009; 59:2894-8. [DOI: 10.1099/ijs.0.010033-0] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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128
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Wu J, Guan T, Jiang H, Zhi X, Tang S, Dong H, Zhang L, Li W. Diversity of Actinobacterial community in saline sediments from Yunnan and Xinjiang, China. Extremophiles 2009; 13:623-32. [PMID: 19504229 DOI: 10.1007/s00792-009-0245-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2008] [Accepted: 03/31/2009] [Indexed: 10/20/2022]
Abstract
The diversity and community structures of actinobacteria in saline sediments collected from Yunnan and Xinjiang Provinces, China, were investigated with cultivation and 16S rRNA gene analysis. A total of 163 actinobacterial isolates were obtained, and they were affiliated with the order Actinomycetales (distributed into five suborders: Streptosporangineae, Micrococcineae, Streptomycineae, Pseudonocardineae, and Glycomycineae). A total of 748 actinobacterial 16S rRNA gene clones were examined, and they could be classified into Actinomycetales, Acidimicrobiales, and unclassified actinobacteria. The Actinomycetales sequences were distributed into nine suborders: Streptosporangineae, Glycomycineae, Micromonosporineae, Pseudonocardineae, Corynebacterineae, Frankineae, Propionibacterineae, Streptomycineae, and Micrococcineae. The unclassified actinobacteria contained three new clusters at the level of subclass or order. Our 16S rRNA gene phylogenetic data indicated that actinobacterial communities were very diverse in the investigated saline sediments (salinity 0.4-11.6%) and some actinobacterial members may be halotolerant or halophilic. The actinobacterial community structures in the saline sediments were different from those in marine and freshwater environments. Our data have implications for a better understanding of the distribution of Actinobacteria in saline environments.
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Affiliation(s)
- Jinyuan Wu
- Yunnan Institute of Microbiology, Yunnan University, Kunming, China.
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129
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Valenzuela-Encinas C, Neria-González I, Alcántara-Hernández RJ, Estrada-Alvarado I, Zavala-Díaz de la Serna FJ, Dendooven L, Marsch R. Changes in the bacterial populations of the highly alkaline saline soil of the former lake Texcoco (Mexico) following flooding. Extremophiles 2009; 13:609-21. [PMID: 19387766 DOI: 10.1007/s00792-009-0244-4] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2009] [Accepted: 03/30/2009] [Indexed: 10/20/2022]
Abstract
Flooding an extreme alkaline-saline soil decreased alkalinity and salinity, which will change the bacterial populations. Bacterial 16S rDNA libraries were generated of three soils with different electrolytic conductivity (EC), i.e. soil with EC 1.7 dS m(-1) and pH 7.80 (LOW soil), with EC 56 dS m(-1) and pH 10.11 (MEDIUM soil) and with EC 159 dS m(-1) and pH 10.02 (HIGH soil), using universal bacterial oligonucleotide primers, and 463 clone 16S rDNA sequences were analyzed phylogenetically. Library proportions and clone identification of the phyla Proteobacteria, Actinobacteria, Acidobacteria, Cyanobacteria, Bacteroidetes, Firmicutes and Cloroflexi showed that the bacterial communities were different. Species and genera of the Rhizobiales, Rhodobacterales and Xanthomonadales orders of the alpha- and gamma-subdivision of Proteobacteria were found at the three sites. Species and genera of the Rhodospirillales, Sphingobacteriales, Clostridiales, Oscillatoriales and Caldilineales were found only in the HIGH soil, Sphingomonadales, Burkholderiales and Pseudomonadales in the MEDIUM soil, Myxococcales in the LOW soil, and Actinomycetales in the MEDIUM and LOW soils. It was found that the largest diversity at the order and species level was found in the MEDIUM soil as bacteria of both the HIGH and LOW soils were found in it.
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130
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Mueller-Spitz SR, Goetz GW, McLellan SL. Temporal and spatial variability in nearshore bacterioplankton communities of Lake Michigan. FEMS Microbiol Ecol 2009; 67:511-22. [PMID: 19220863 DOI: 10.1111/j.1574-6941.2008.00639.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The spatial and temporal variability of bacterial communities were determined for the nearshore waters of Lake Michigan, an oligotrophic freshwater inland sea. A freshwater estuary and nearshore sites were compared six times during 2006 using denaturing gradient gel electrophoresis (DGGE). Bacterial composition clustered by individual site and date rather than by depth. Seven 16S rRNA gene clone libraries were constructed, yielding 2717 bacterial sequences. Spatial variability was detected among the DGGE banding patterns and supported by clone library composition. The clone libraries from deep waters and the estuary environment revealed highest overall bacterial diversity. Betaproteobacteria sequence types were the most dominant taxa, comprising 40.2-67.7% of the clone libraries. BAL 47 was the most abundant freshwater cluster of Betaproteobacteria, indicating widespread distribution of this cluster in the nearshore waters of Lake Michigan. Incertae sedis 5 and Oxalobacteraceae sequence types were prevalent in each clone library, displaying more diversity than previously described in other freshwater environments. Among the Oxalobacteraceae sequences, a globally distributed freshwater cluster was determined. The nearshore waters of Lake Michigan are a dynamic environment that experience forces similar to the coastal ocean environment and share common bacterial diversity with other freshwater habitats.
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131
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Navarro JB, Moser DP, Flores A, Ross C, Rosen MR, Dong H, Zhang G, Hedlund BP. Bacterial succession within an ephemeral hypereutrophic Mojave Desert playa Lake. MICROBIAL ECOLOGY 2009; 57:307-320. [PMID: 18758846 DOI: 10.1007/s00248-008-9426-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2008] [Accepted: 07/03/2008] [Indexed: 05/26/2023]
Abstract
Ephemerally wet playas are conspicuous features of arid landscapes worldwide; however, they have not been well studied as habitats for microorganisms. We tracked the geochemistry and microbial community in Silver Lake playa, California, over one flooding/desiccation cycle following the unusually wet winter of 2004-2005. Over the course of the study, total dissolved solids increased by approximately 10-fold and pH increased by nearly one unit. As the lake contracted and temperatures increased over the summer, a moderately dense planktonic population of approximately 1x10(6) cells ml(-1) of culturable heterotrophs was replaced by a dense population of more than 1x10(9) cells ml(-1), which appears to be the highest concentration of culturable planktonic heterotrophs reported in any natural aquatic ecosystem. This correlated with a dramatic depletion of nitrate as well as changes in the microbial community, as assessed by small subunit ribosomal RNA gene sequencing of bacterial isolates and uncultivated clones. Isolates from the early-phase flooded playa were primarily Actinobacteria, Firmicutes, and Bacteroidetes, yet clone libraries were dominated by Betaproteobacteria and yet uncultivated Actinobacteria. Isolates from the late-flooded phase ecosystem were predominantly Proteobacteria, particularly alkalitolerant isolates of Rhodobaca, Porphyrobacter, Hydrogenophaga, Alishwenella, and relatives of Thauera; however, clone libraries were composed almost entirely of Synechococcus (Cyanobacteria). A sample taken after the playa surface was completely desiccated contained diverse culturable Actinobacteria typically isolated from soils. In total, 205 isolates and 166 clones represented 82 and 44 species-level groups, respectively, including a wide diversity of Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, Gemmatimonadetes, Acidobacteria, and Cyanobacteria.
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Affiliation(s)
- Jason B Navarro
- School of Life Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154-4004, USA
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132
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Sorokin DY, van Pelt S, Tourova TP, Evtushenko LI. Nitriliruptor alkaliphilus gen. nov., sp. nov., a deep-lineage haloalkaliphilic actinobacterium from soda lakes capable of growth on aliphatic nitriles, and proposal of Nitriliruptoraceae fam. nov. and Nitriliruptorales ord. nov. Int J Syst Evol Microbiol 2009; 59:248-53. [DOI: 10.1099/ijs.0.002204-0] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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133
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Pouliot J, Galand PE, Lovejoy C, Vincent WF. Vertical structure of archaeal communities and the distribution of ammonia monooxygenase A gene variants in two meromictic High Arctic lakes. Environ Microbiol 2009; 11:687-99. [PMID: 19207564 DOI: 10.1111/j.1462-2920.2008.01846.x] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The distribution of archaeal amoA and 16S rRNA genes was evaluated in two marine-derived, meromictic lakes in the Canadian High Arctic: Lake A and Lake C1 on the northern coast of Ellesmere Island. The amoA gene was recorded in both lakes, with highest copy numbers in the oxycline. Sequence analysis showed that amoA from the two lakes shared 94% similarity, indicating at least two phylogenetically distinct clusters. Clone libraries of archaeal 16S rRNA genes from Lake A revealed strong vertical differences in archaeal community diversity and composition down the water column. The oxic layer was dominated by one group of Euryarchaeota affiliated to the Lake Dagow Sediment (LDS) cluster. This group was absent from the oxycline, which had an extremely low archaeal diversity of two phylotypes. Both belonged to the Crenarchaeota Marine Group I (MGI), the marine group that has been linked to archaeal amoA; however, there was a low ratio of amoA to MGI copy numbers, suggesting that many MGI Archaea did not carry the amoA gene. The anoxic zone contained representatives of the RC-V (Rice Cluster-V) and LDS clusters of Euryarchaeota. These results show the strong vertical differentiation of archaeal communities in polar meromictic lakes, and they suggest archaeal nitrification within the oxycline of these highly stratified waters.
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Affiliation(s)
- Jérémie Pouliot
- Département de Biologie and Québec-Océan, Université Laval, Québec, QC, Canada
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134
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Baik KS, Park SC, Kim EM, Bae KS, Ahn JH, Ka JO, Chun J, Seong CN. Diversity of bacterial community in freshwater of Woopo wetland. J Microbiol 2008; 46:647-55. [PMID: 19107393 DOI: 10.1007/s12275-008-0135-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Accepted: 09/03/2008] [Indexed: 11/28/2022]
Abstract
Diversity of bacterial community in water layer of Woopo wetland was investigated. Cultivable bacterial strains were isolated by the standard dilution plating technique and culture-independent 16S rRNA gene clones were obtained directly from DNA extracts of a water sample. Amplified rDNA restriction analysis (ARDRA) was applied onto both of the isolates and 16S rRNA gene clones. Rarefaction curves, coverage rate and diversity indices of ARDRA patterns were calculated. Representative isolates and clones of all the single isolate/clone phylotype were partially sequenced and analyzed phylogenetically. Sixty-four and 125 phylotypes were obtained from 203 bacterial isolates and 235 culture-independent 16S rRNA gene clones, respectively. Bacterial isolates were composed of 4 phyla, of which Firmicutes (49.8%) and Actinobacteria (32.0%) were predominant. Isolates were affiliated with 58 species. Culture-independent 16S rRNA gene clones were composed of 8 phyla, of which Proteobacteria (62.2%), Actinobacteria (15.5%), and Bacteroidetes (13.7%) were predominant. Diversity of 16S rRNA gene clones originated from cultivation-independent DNA extracts was higher than that of isolated bacteria.
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Affiliation(s)
- Keun Sik Baik
- Department of Biology, Sunchon National University, Suncheon, 540-742, Republic of Korea
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135
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Gupta RS. The Phylogeny and Signature Sequences Characteristics ofFibrobacteres,Chlorobi, andBacteroidetes. Crit Rev Microbiol 2008; 30:123-43. [PMID: 15239383 DOI: 10.1080/10408410490435133] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Fibrobacteres, Chlorobi, and Bacteroidetes (FCB group) comprise three main bacterial phyla recognized on the basis of 16S rRNA trees. Presently, there are no distinctive biochemical or molecular characteristics known that can distinguish these bacteria from other bacterial phyla. The relationship of these bacteria to other phyla is also not known. This review describes many signatures, consisting of defined and conserved inserts in widely distributed proteins, that provide distinctive molecular markers for these groups of bacteria. These signatures serve to clarify the evolutionary relationship between members of the FCB group, and to other bacterial phyla. A 4 aa insert in DNA Gyrase B (GyrB) and a 45 aa insert in the SecA proteins are uniquely shared by various Bacteroidetes species. The insert in GyrB is present in all Bacteroidetes species (>100) covering different orders and families, indicating that it is a distinctive characteristic of the group. Three signatures consisting of an 18 aa insert in ATPase alpha-subunit, an 8-9 aa insert in the FtsK protein and a 1 aa insert in the UvrB protein are commonly shared only by the Bacteroidetes and Chlorobi homologs providing evidence that these two groups are specifically related to each other. Two additional inserts in the RNA polymerase beta'-subunit (5-7 aa) and Serine hydroxymethyl-transferase (14-16 aa), which are commonly present in various Bacteroidetes, Chlorobi, and Fibrobacteres homologs, but not any other bacteria, provide evidence that these groups shared a common ancestor exclusive of all other bacteria. The FCB groups of bacteria are indicated to have diverged from this common ancestor in the following order: Fibrobacteres --> Chlorobi --> Bacteriodetes. The inferences from signature sequences are strongly supported by phylogenetic analyses. These observations suggest that the FCB groups of bacteria should be placed in a single phylum rather than three distinct phyla. Signature sequences in a number of other proteins provide evidence that the FCB group of bacteria diverged at a similar time as the Chlamydiae group, and that the Spirochetes and Aquificales groups are its closest relatives.
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Affiliation(s)
- Radhey S Gupta
- Department of Biochemistry, McMaster University, Hamilton, Ontario, Canada.
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136
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First cultivation and ecological investigation of a bacterium affiliated with the candidate phylum OP5 from hot springs. Appl Environ Microbiol 2008; 74:6223-9. [PMID: 18776034 DOI: 10.1128/aem.01351-08] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The phylogenetic group termed OP5 was originally discovered in the Yellowstone National Park hot spring and proposed as an uncultured phylum; the group was afterwards analyzed by applying culture-independent approaches. Recently, a novel thermophilic chemoheterotrophic filamentous bacterium was obtained from a hot spring in Japan that was enriched through various isolation procedures. Phylogenetic analyses of the isolate have revealed that it is closely related to the OP5 phylum that has mainly been constructed with the environmental clones retrieved from thermophilic and mesophilic anaerobic environments. It appears that the lineage is independent at the phylum level in the domain Bacteria. Therefore, we designed a primer set for the 16S rRNA gene to specifically target the OP5 phylum and performed quantitative field analysis by using the real-time PCR method. Thus, the 16S rRNA gene of the OP5 phylum was detected in some hot-spring samples with the relative abundance ranging from 0.2% to 1.4% of the prokaryotic organisms detected. The physiology of the above-mentioned isolate and the related environmental clones indicated that they are scavengers contributing to the sulfur cycle in nature.
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137
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Llirós M, Casamayor EO, Borrego C. High archaeal richness in the water column of a freshwater sulfurous karstic lake along an interannual study. FEMS Microbiol Ecol 2008; 66:331-42. [PMID: 18754782 DOI: 10.1111/j.1574-6941.2008.00583.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
We surveyed the archaeal assemblage in a stratified sulfurous lake (Lake Vilar, Banyoles, Spain) over 5 consecutive years to detect potential seasonal and interannual trends in the free-living planktonic Archaea composition. The combination of different primer pairs and nested PCR steps revealed an unexpectedly rich archaeal community. Overall, 140 samples were analyzed, yielding 169 different 16S rRNA gene sequences spread over 14 Crenarchaeota (109 sequences) and six Euryarchaeota phylogenetic clusters. Most of the Crenarchaeota (98% of the total crenarchaeotal sequences) affiliated within the Miscellaneous Crenarchaeota Group (MCG) and were related to both marine and freshwater phylotypes. Euryarchaeota mainly grouped within the Deep Hydrothermal Vent Euryarchaeota (DHVE) cluster (80% of the euryarchaeotal sequences) and the remaining 20% distributed into three less abundant taxa, most of them composed of soil and sediment clones. The largest fraction of phylotypes from the two archaeal kingdoms (79% of the Crenarchaeota and 54% of the Euryarchaeota) was retrieved from the anoxic hypolimnion, indicating that these cold and sulfide-rich waters constitute an unexplored source of archaeal richness. The taxon rank-frequency distribution showed two abundant taxa (MCG and DHVE) that persisted in the water column through seasons, plus several rare ones that were only detected occasionally. Differences in richness distribution and seasonality were observed, but no clear correlations were obtained when multivariate statistical analyses were carried out.
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Affiliation(s)
- Marc Llirós
- Group of Molecular Microbial Ecology, Institute of Aquatic Ecology, University of Girona, Girona, Spain
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138
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Del Giudice L, Massardo DR, Pontieri P, Bertea CM, Mombello D, Carata E, Tredici SM, Talà A, Mucciarelli M, Groudeva VI, De Stefano M, Vigliotta G, Maffei ME, Alifano P. The microbial community of Vetiver root and its involvement into essential oil biogenesis. Environ Microbiol 2008; 10:2824-41. [PMID: 18662308 DOI: 10.1111/j.1462-2920.2008.01703.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Vetiver is the only grass cultivated worldwide for the root essential oil, which is a mixture of sesquiterpene alcohols and hydrocarbons, used extensively in perfumery and cosmetics. Light and transmission electron microscopy demonstrated the presence of bacteria in the cortical parenchymatous essential oil-producing cells and in the lysigen lacunae in close association with the essential oil. This finding and the evidence that axenic Vetiver produces in vitro only trace amounts of oil with a strikingly different composition compared with the oils from in vivo Vetiver plants stimulated the hypothesis of an involvement of these bacteria in the oil metabolism. We used culture-based and culture-independent approaches to analyse the microbial community of the Vetiver root. Results demonstrate a broad phylogenetic spectrum of bacteria, including alpha-, beta- and gamma-Proteobacteria, high-G+C-content Gram-positive bacteria, and microbes belonging to the Fibrobacteres/Acidobacteria group. We isolated root-associated bacteria and showed that most of them are able to grow by using oil sesquiterpenes as a carbon source and to metabolize them releasing into the medium a large number of compounds typically found in commercial Vetiver oils. Several bacteria were also able to induce gene expression of a Vetiver sesquiterpene synthase. These results support the intriguing hypothesis that bacteria may have a role in essential oil biosynthesis opening the possibility to use them to manoeuvre the Vetiver oil molecular structure.
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Affiliation(s)
- Luigi Del Giudice
- Institute of Genetics and Biophysics 'Adriano Buzzati-Traverso', Consiglio Nazionale delle Ricerche, via Pietro Castellino 111, 80131 Naples, Italy
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139
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Spatial and temporal patterns in the microbial diversity of a meromictic soda lake in Washington State. Appl Environ Microbiol 2008; 74:4877-88. [PMID: 18552187 DOI: 10.1128/aem.00455-08] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The microbial community diversity and composition of meromictic Soap Lake were studied using culture-dependent and culture-independent approaches. The water column and sediments were sampled monthly for a year. Denaturing gradient gel electrophoresis of bacterial and archaeal 16S rRNA genes showed an increase in diversity with depth for both groups. Late-summer samples harbored the highest prokaryotic diversity, and the bacteria exhibited less seasonal variability than the archaea. Most-probable-number assays targeting anaerobic microbial guilds were performed to compare summer and fall samples. In both seasons, the anoxic samples appeared to be dominated by lactate-oxidizing sulfate-reducing prokaryotes. High numbers of lactate- and acetate-oxidizing iron-reducing bacteria, as well as fermentative microorganisms, were also found, whereas the numbers of methanogens were low or methanogens were undetectable. The bacterial community composition of summer and fall samples was also assessed by constructing 16S rRNA gene clone libraries. A total of 508 sequences represented an estimated >1,100 unique operational taxonomic units, most of which were from the monimolimnion, and the summer samples were more diverse than the fall samples (Chao1 = 530 and Chao1 = 295, respectively). For both seasons, the mixolimnion sequences were dominated by Gammaproteobacteria, and the chemocline and monimolimnion libraries were dominated by members of the low-G+C-content group, followed by the Cytophaga-Flexibacter-Bacteroides (CFB) group; the mixolimnion sediments contained sequences related to uncultured members of the Chloroflexi and the CFB group. Community overlap and phylogenetic analyses, however, not only demonstrated that there was a high degree of spatial turnover but also suggested that there was a degree of temporal variability due to differences in the members and structures of the communities.
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140
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Nam YD, Sung Y, Chang HW, Roh SW, Kim KH, Rhee SK, Kim JC, Kim JY, Yoon JH, Bae JW. Characterization of the depth-related changes in the microbial communities in Lake Hovsgol sediment by 16S rRNA gene-based approaches. J Microbiol 2008; 46:125-36. [PMID: 18545961 DOI: 10.1007/s12275-007-0189-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2007] [Accepted: 01/20/2008] [Indexed: 11/26/2022]
Abstract
The undisturbed sediment of Lake Hovsgol (Mongolia) is scientifically important because it represents a record of the environmental changes that took place between the Holocene (the present age) and Pleistocene (the last ice age; 12,000 14C years before present day). Here, we investigated how the current microbial communities change as the depth increases by PCR-denaturing gradient gel electrophoresis (DGGE) analysis of the 16S rRNA genes of the microbial communities. The microbial diversity, as estimated by the Shannon index, decreased as the depth increased. In particular, significant changes in archaeal diversity were observed in the middle depth (at 39-42 cm depth of total 60 cm depth) that marks the border between the Holocene and Pleistocene. Phylotype belonging to Beta-and Gamma-Proteobacteria were the predominant bacteria and most of these persisted throughout the depth examined. However, as the depth increased, some bacteria (some genera belonging to Beta-Proteobacteria, Nitrospira, and OP8-9) were not detectable while others (some genera belonging to Alpha-, Beta-, Gamma-Proteobacteria) newly detected by DGGE. Crenarchaea were the predominant archaea and only one phylotype belonging to Euryarchaea was found. Both the archaeal and bacterial profiles revealed by the DGGE band patterns could be grouped into four and three subsets, respectively, subsets that were largely divided by the border between the Holocene and Pleistocene. Thus, the diversity of the current microbial communities in Lake Hovsgol sediments decreases with increasing depth. These changes probably relate to the environmental conditions in the sediments, which were shaped by the paleoclimatic events taking place between the Holocene and Pleistocene.
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Affiliation(s)
- Young-Do Nam
- Biological Resource Center, KRIBB, Daejeon, 305-806, Republic of Korea
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141
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Jiang H, Dong H, Yu B, Ye Q, Shen J, Rowe H, Zhang C. Dominance of putative marine benthic Archaea in Qinghai Lake, north-western China. Environ Microbiol 2008; 10:2355-67. [PMID: 18498366 DOI: 10.1111/j.1462-2920.2008.01661.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Recent studies have revealed important and versatile roles that Archaea play in a wide variety of environmental processes on Earth. In this study, we investigated the abundance and diversity of archaeal communities in lake water and a 5 m sediment core collected from Qinghai Lake on the Tibetan Plateau, north-western China. An integrated approach was employed including geochemistry, quantitative polymerase chain reaction (Q-PCR) and 16S rRNA gene analysis. Here, we show that Archaea dominated the prokaryotic community in the lake sediments. Members of putative marine benthic groups [Marine Benthic Group (MBG)-B, -C and -D] and Miscellaneous Crenarchaeotic Group (MCG) were dominant, many of which were previously reported to be predominantly present in deep-sea environments. These results demonstrate that these groups are not limited to marine sediments. Despite their ubiquitous presence in aquatic environments, metabolic functions of these important groups largely remain unknown. Whereas many of these groups (such as MBG-B and -D) have typically been found in methane-hydrate deposits in marine environments, our carbon isotopic and molecular results from Qinghai Lake sediments indicate a lacustrine origin.
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Affiliation(s)
- Hongchen Jiang
- Department of Geology, Miami University, Oxford, OH 45056, USA
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142
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143
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Demergasso C, Escudero L, Casamayor EO, Chong G, Balagué V, Pedrós-Alió C. Novelty and spatio–temporal heterogeneity in the bacterial diversity of hypersaline Lake Tebenquiche (Salar de Atacama). Extremophiles 2008; 12:491-504. [DOI: 10.1007/s00792-008-0153-y] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2007] [Accepted: 02/13/2008] [Indexed: 10/22/2022]
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144
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Selenate-dependent anaerobic arsenite oxidation by a bacterium from Mono Lake, California. Appl Environ Microbiol 2008; 74:2588-94. [PMID: 18326681 DOI: 10.1128/aem.01995-07] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Arsenate was produced when anoxic Mono Lake water samples were amended with arsenite and either selenate or nitrate. Arsenite oxidation did not occur in killed control samples or live samples with no added terminal electron acceptor. Potential rates of anaerobic arsenite oxidation with selenate were comparable to those with nitrate ( approximately 12 to 15 mumol.liter(-1) h(-1)). A pure culture capable of selenate-dependent anaerobic arsenite oxidation (strain ML-SRAO) was isolated from Mono Lake water into a defined salts medium with selenate, arsenite, and yeast extract. This strain does not grow chemoautotrophically, but it catalyzes the oxidation of arsenite during growth on an organic carbon source with selenate. No arsenate was produced in pure cultures amended with arsenite and nitrate or oxygen, indicating that the process is selenate dependent. Experiments with washed cells in mineral medium demonstrated that the oxidation of arsenite is tightly coupled to the reduction of selenate. Strain ML-SRAO grows optimally on lactate with selenate or arsenate as the electron acceptor. The amino acid sequences deduced from the respiratory arsenate reductase gene (arrA) from strain ML-SRAO are highly similar (89 to 94%) to those from two previously isolated Mono Lake arsenate reducers. The 16S rRNA gene sequence of strain ML-SRAO places it within the Bacillus RNA group 6 of gram-positive bacteria having low G+C content.
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145
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Abstract
We describe a hitherto unrecognized bacterial community, inhabiting the leaf surfaces of the salt-excreting desert tree Tamarix. High temperatures, strong radiation, and very low humidity dictate a daytime existence in complete desiccation, but damp nights allow the microbial population to proliferate in a sugar-rich, alkaline, and hypersaline solution, before drying up again after sunrise. The exclusively bacterial population contains many undescribed species and genera, but nevertheless appears to be characterized by relatively limited species diversity. Sequences of 16S rRNA genes from either isolates or total community DNA place the identified members of the community in five bacterial groups (Actinobacteria, Bacteroidetes, Firmicutes, alpha-, and gamma-Proteobacteria); in each of these, they concentrate in a very narrow branch that in most cases harbors organisms isolated from unrelated halophilic environments.
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146
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Joshi AA, Kanekar PP, Kelkar AS, Shouche YS, Vani AA, Borgave SB, Sarnaik SS. Cultivable bacterial diversity of alkaline Lonar lake, India. MICROBIAL ECOLOGY 2008; 55:163-72. [PMID: 17604989 DOI: 10.1007/s00248-007-9264-8] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2006] [Accepted: 04/16/2007] [Indexed: 05/16/2023]
Abstract
Aerobic, alkaliphilic bacteria were isolated and characterized from water and sediment samples collected in the winter season, January 2002 from alkaline Lonar lake, India, having pH 10.5. The total number of microorganisms in the sediment and water samples was found to be 10(2)-10(6) cfu g(-1) and 10(2)-10(4) cfu ml(-1), respectively. One hundred and ninety-six strains were isolated using different enrichment media. To study the bacterial diversity of Lonar lake and to select the bacterial strains for further characterization, screening was done on the basis of pH and salt tolerance of the isolates. Sixty-four isolates were subjected to phenotypic, biochemical characterization and 16S rRNA sequencing. Out of 64, 31 bacterial isolates were selected on the basis of their enzyme profile and further subjected to phylogenetic analysis. Phylogenetic analysis indicated that most of the Lonar lake isolates were related to the phylum Firmicutes, containing Low G+C, Gram-positive bacteria, with different genera: Bacillus, Paenibacillus, Alkalibacillus, Exiguobacterium, Planococcus, Enterococcus and Vagococcus. Seven strains constituted a Gram-negative bacterial group, with different genera: Halomonas, Stenotrophomonas and Providencia affiliated to gamma-Proteobacteria, Alcaligenes to beta-Proteobacteria and Paracoccus to alpha-Proteobacteria. Only five isolates were High G+C, Gram-positive bacteria associated with phylum Actinobacteria, with various genera: Cellulosimicrobium, Dietzia, Arthrobacter and Micrococcus. Despite the alkaline pH of the Lonar lake, most of the strains were alkalitolerant and only two strains were obligate alkaliphilic. Most of the isolates produced biotechnologically important enzymes at alkaline pH, while only two isolates (ARI 351 and ARI 341) showed the presence of polyhydroxyalkcanoate (PHA) and exopolysaccharide (EPS), respectively.
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Affiliation(s)
- Amarja A Joshi
- Microbial Sciences Division, Agharkar Research Institute, G. G. Agarkar Road, Pune 411004, Maharashtra State, India
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147
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Zhao X, Yang L, Yu Z, Peng N, Xiao L, Yin D, Qin B. Characterization of depth-related microbial communities in lake sediment by denaturing gradient gel electrophoresis of amplified 16S rRNA fragments. J Environ Sci (China) 2008; 20:224-230. [PMID: 18574965 DOI: 10.1016/s1001-0742(08)60035-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The characterization of microbial communities of different depth sediment samples was examined by a culture-independent method and compared with physicochemical parameters, those are organic matter (OM), total nitrogen (TN), total phosphorus (TP), pH and redox potential (Eh). Total genomic DNA was extracted from samples derived from different depths. After they were amplified with the GC-341f/907r primer sets of partial bacterial 16S rRNA genes, the products were separated by denaturing gradient gel electrophoresis (DGGE). The profile of DGGE fingerprints of different depth sediment samples revealed that the community structure remained relatively stable along the entire 45 cm sediment core, however, principal-component analysis of DGGE patterns revealed that at greater sediment depths, successional shifts in community structure were evident. The principle coordinates analysis suggested that the bacterial communities along the sediment core could be separated into two groups, which were located 0--20 cm and 21--45 cm, respectively. The sequencing dominant bands demonstrated that the major phylogenetic groups identified by DGGE belonged to Bacillus, Bacterium, Brevibacillus, Exiguobacterium, gamma-Proteobacterium, Acinetobacter sp. and some uncultured or unidentified bacteria. The results indicated the existence of highly diverse bacterial community in the lake sediment core.
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Affiliation(s)
- Xingqing Zhao
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
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148
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Valenzuela-Encinas C, Neria-González I, Alcántara-Hernández RJ, Enríquez-Aragón JA, Estrada-Alvarado I, Hernández-Rodríguez C, Dendooven L, Marsch R. Phylogenetic analysis of the archaeal community in an alkaline-saline soil of the former lake Texcoco (Mexico). Extremophiles 2007; 12:247-54. [DOI: 10.1007/s00792-007-0121-y] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2007] [Accepted: 10/29/2007] [Indexed: 11/30/2022]
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149
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Bacterial diversity and activity along a salinity gradient in soda lakes of the Kulunda Steppe (Altai, Russia). Extremophiles 2007; 12:133-45. [DOI: 10.1007/s00792-007-0117-7] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Accepted: 09/17/2007] [Indexed: 11/25/2022]
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150
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Mesbah NM, Abou-El-Ela SH, Wiegel J. Novel and unexpected prokaryotic diversity in water and sediments of the alkaline, hypersaline lakes of the Wadi An Natrun, Egypt. MICROBIAL ECOLOGY 2007; 54:598-617. [PMID: 17450395 DOI: 10.1007/s00248-006-9193-y] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 11/16/2006] [Accepted: 11/26/2006] [Indexed: 05/08/2023]
Abstract
The phylogenetic diversity of the bacterial and archaeal community in the water and sediments of three large lakes of the Wadi An Natrun was investigated using 16S rRNA clone libraries. The bacterial community was diverse: 769 clones formed 345 operational taxonomic units (OTUs) defined at 99% 16S rRNA sequence identity. The bacterial community in both the water and sediments of the lakes was dominated by clones affiliated with the low G + C Gram-type-positive group, alpha-proteobacteria, and Bacteroidetes, (11-39, 11-30, and 10-37% of OTUs observed, respectively), patterns that have been observed in previously described alkaline, athalassohaline systems. However, a relatively high proportion of Firmicutess-related clones in the water of the lakes and alpha-proteobacteria in the sediments was observed. The bacterial community composition of the water and sediment of the same lake and of different lakes was significantly different (p < 0.05). Operational taxonomic units related to the gamma-proteobacteria were more abundant in the sediment of Lake Fazda, whereas the sediment of Lake UmRisha was dominated by members of the delta-proteobacteria. The proportion of gamma-proteobacterial and Bacteroidetes-affiliated OTUs were predominant in the water of Lake UmRisha and differed significantly from other lake waters (chi-squared analysis, p < or = 0.01). The more oxygenated and dilute nature of Lake Hamra was reflected in its microbial community composition, with the abundance of Bacillales sequences in the water, the absence of Halanaerobiales, Clostridiales, and Archaea in the water, and the presence of representatives of more phyla such as the Actinobacteria, Spirochaetes, and Verrucomicrobia. The archaeal community composition appeared less diverse: 589 clones resulted in 198 OTUs defined at 99% 16S rRNA sequence identity, and all sequences fell into the phylum Euryarchaeota. Phylogenetic analysis showed that many of the sequences were distantly related (83-90% 16S rRNA sequence identity) to cultured and uncultured archaea, with many clones forming clusters that branched deeply within the Euryarchaeota. Forty-two and 53% of the bacterial and archaeal clones had less than 90% 16S rRNA sequence identity to previously described sequences. This indicates that the water and sediments of the Wadi An Natrun harbor a unique and novel prokaryotic diversity that is different from what has been described among other alkaline, athalassohaline lakes.
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Affiliation(s)
- Noha M Mesbah
- Department of Microbiology, University of Georgia, Athens, GA 30602-2605, USA.
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