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Litchfield, Carol D.; Irby, Amy; Kis-Papo, Tamar; Oren, Aharon

doi:10.1023/a:1014513317746

Cited by 14 publications

(2 citation statements)

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“…Some of the best examples of chemical gradients are found in solar salterns around the world (Anton et al, 2000; Litchfield et al, 2001; Baati et al, 2008; Oren, 2008; Manikandan et al, 2009; Oh et al, 2010). Like most hypersaline habitats, these evaporation ponds typically contain abundant microbial populations including members of all three domains of life (Javor, 1989).…”

Section: Introductionmentioning

confidence: 99%

Patterns of microbial diversity along a salinity gradient in the Guerrero Negro solar saltern, Baja CA Sur, Mexico

et al. 2013

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The goal of this study was to use environmental sequencing of 16S rRNA and bop genes to compare the diversity of planktonic bacteria and archaea across ponds with increasing salinity in the Exportadora de Sal (ESSA) evaporative saltern in Guerrero Negro, Baja CA S., Mexico. We hypothesized that diverse communities of heterotrophic bacteria and archaea would be found in the ESSA ponds, but that bacterial diversity would decrease relative to archaea at the highest salinities. Archaeal 16S rRNA diversity was higher in Ponds 11 and 12 (370 and 380 g l−1 total salts, respectively) compared to Pond 9 (180 g l−1 total salts). Both Pond 11 and 12 communities had high representation (47 and 45% of clones, respectively) by Haloquadratum walsbyi-like (99% similarity) lineages. The archaeal community in Pond 9 was dominated (79%) by a single uncultured phylotype with 99% similarity to sequences recovered from the Sfax saltern in Tunisia. This pattern was mirrored in bop gene diversity with greater numbers of highly supported phylotypes including many Haloquadratum-like sequences from the two highest salinity ponds. In Pond 9, most bop sequences, were not closely related to sequences in databases. Bacterial 16S rRNA diversity was higher than archaeal in both Pond 9 and Pond 12 samples, but not Pond 11, where a non-Salinibacter lineage within the Bacteroidetes >98% similar to environmental clones recovered from Lake Tuz in Turkey and a saltern in Chula Vista, CA was most abundant (69% of community). This OTU was also the most abundant in Pond 12, but only represented 14% of clones in the more diverse pond. The most abundant OTU in Pond 9 (33% of community) was 99% similar to an uncultured gammaproteobacterial clone from the Salton Sea. Results suggest that the communities of saltern bacteria and archaea vary even in ponds with similar salinity and further investigation into the ecology of diverse, uncultured halophile communities is warranted.

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Section: Introductionmentioning

confidence: 99%

Patterns of microbial diversity along a salinity gradient in the Guerrero Negro solar saltern, Baja CA Sur, Mexico

et al. 2013

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“…The metabolic activity patterns can be related to the composition of the organic carbon pool and its bioavailability to the microbial community. Nowadays, it is widely recognized that the metabolism of a community is greater than that of the individuals included in the community [53]. Among the individual carbon sources, in this study only 12.90% (4 of 31) of the different Biolog Ecoplates substrates were used by PVC-associated microbes, while 19.35% (6 of 31) were used by PE-associated ones; conversely, 70.97% of the substrates (22 of 31) were metabolized by the pelagic community.…”

Section: Comparison Between Sampling Stations and Among Matricesmentioning

confidence: 99%

Microbial Biofilm Colonizing Plastic Substrates in the Ross Sea (Antarctica): First Overview of Community-Level Physiological Profiles

Caruso

Maimone

Rappazzo

et al. 2023

JMSE

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The microbial colonization of plastic substrates made of polyvinylchloride (PVC) and polyethylene (PE) was studied in Tethys and Road Bays (Ross Sea, Antarctica) in order to evaluate the metabolic profiles of the plastisphere community in comparison with those of the surrounding waters. PVC and PE panels, mounted on stainless steel structures, were deployed in the austral summer 2017 at 5 and 20 m and recovered one year later at four different stations (Amorphous Glacier-AG was potentially impacted by the ice-melting process, and its control site was within Tethys Bay-TB; Road Bay-RB, close to the wastewater plant of the Italian research station Mario Zucchelli and its control site Punta Stocchino-PTS). Additional panels were settled in Road Bay at 5 m and recovered after three months to follow time variability in the microbial colonization process. At the same times and depths as plastic substrates, water samples were also collected. Carbon substrates’ utilization rates were determined on scraped microbial biofilm and water samples, with a fluorimetric assay based on 96-well Biolog Ecoplates. Complex carbon sources, carbohydrate and amines were the organic substrates that mostly fuelled the community metabolism in the RB area, while in the TB area, in addition to carbohydrates, phosphate carbon compounds and amino acids were also actively utilized. Within Road Bay, small differences in the physiological profiles were found, with higher metabolic rates in the biofilm community after 3 months’ deployment (late austral summer period) compared to 12 months, suggesting that autumn to spring period conditions negatively affected foulers’ metabolism. Moreover, different metabolic profiles between the plastisphere and the pelagic microbial community were observed; this last utilized a higher number of carbon sources, while plastic substrates were colonized by a more specialized community. Higher carbon substrate utilization rates were recorded at RB and AG stations, receiving organic supply from anthropic activity or ice melting sources, respectively, compared to their control sites. These results highlighted the functional plasticity of the microbial community, with the adaptive ability to utilize a diversified range of organic substrates.

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Solar Salterns

2003

Cellular Origin, Life in Extreme Habitats and Astrobiology

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Cited by 14 publications

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Patterns of microbial diversity along a salinity gradient in the Guerrero Negro solar saltern, Baja CA Sur, Mexico

Patterns of microbial diversity along a salinity gradient in the Guerrero Negro solar saltern, Baja CA Sur, Mexico

Microbial Biofilm Colonizing Plastic Substrates in the Ross Sea (Antarctica): First Overview of Community-Level Physiological Profiles

Solar Salterns

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