The natural and anthropogenic microbiota of Glerá, a sub-arctic river in northeastern Iceland

Markúsdóttir, María; Heiðmarsson, Starri; Eyþórsdóttir, Arnheiður; Magnússon, Kristinn P.; Vilhelmsson, Oddur

doi:10.1016/j.ibiod.2012.04.001

Cited by 12 publications

(4 citation statements)

References 65 publications

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“…Interestingly, co-isolation of strains did not appear to be an important factor for their ability to engage in a social behavior, and even our canonical two species were not co-isolated, one having been isolated in Dutch dune soil, and the other from sandy-loam soil in a farm in MA, U.S.A (33,34). The vast majority of the species we tested were isolated from soil, but Pseudomonas and Pedobacter can be isolated from a variety of different environments (35)(36)(37)(38)(39)(40). Ultimately, close relationship to our initial two study strains is a better predictor of interaction than the environment from which the strains were isolated.…”

Section: Discussionmentioning

confidence: 69%

“…Isolate from sub-Arctic terricolous lichen (36) MAS018 Isolate from sub-Arctic terricolous lichen (36) MAS029 Isolate from sub-Arctic terricolous lichen (36) MAS035 Isolate from sub-Arctic terricolous lichen (36) G082 Isolate from sub-Arctic river water (35)…”

Section: Mas011mentioning

confidence: 99%

“…Isolate from sub-Arctic river water (35) JF1508 Isolate from glacial river water (80) JF0115 Isolate from glacial river water (80) Pseudopedobacter saltans DSM12145…”

Section: V10001mentioning

confidence: 99%

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Exploration of social spreading reveals behavior is prevalent amongPedobacterandP. fluorescensisolates, and shows variations in induction of phenotype

McCully

Graslie

Bitzer

et al. 2019

Preprint

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Within soil, bacteria are naturally found in multi-species communities, where interactions can lead to emergent community properties. It is critical that we study bacteria in a social context to investigate community-level functions. We previously showed that when co-cultured, Pseudomonas fluorescens Pf0-1 and Pedobacter sp. V48 engage in interspecies social spreading on a hard agar surface, a behavior which required close contact and was dependent on the nutritional environment. In this study, we investigate whether the ability to participate in social spreading is widespread among P. fluorescens and Pedobacter isolates, and whether the requirements for interaction vary. We find that this phenotype is not restricted to the interaction between P. fluorescens Pf0-1 and Pedobacter sp. V48, but is a more prevalent behavior found in one clade in the P. fluorescens group and two clades in the Pedobacter genus. We also discovered that the interaction with certain Pedobacter isolates occurred without close contact, indicating induction of spreading by a putative diffusible signal. As is the case for ISS by Pf0-1+V48, motility of all interacting pairs is influenced by the environment, with no spreading behaviors observed under high nutrient conditions. While Pf0-1+V48 require low nutrient but high NaCl conditions, in the broader range of interacting pairs this requirement for low nutrient and high salt was variable. The prevalence of motility phenotypes observed in this study and found within the literature indicates that community-induced locomotion in general, and social spreading in particular, is likely important within the environment. It is crucial that we continue to study microbial interactions and their emergent properties to gain a fuller understanding of the functions of microbial communities.

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Section: Discussionmentioning

confidence: 69%

Section: Mas011mentioning

confidence: 99%

See 1 more Smart Citation

Exploration of social spreading reveals behavior is prevalent amongPedobacterandP. fluorescensisolates, and shows variations in induction of phenotype

McCully

Graslie

Bitzer

et al. 2019

Preprint

Self Cite

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“…Microbial communities containing facultative chemolithotrophs and hydrocarbon oxidizers, could be valuable for bioremediation of petroleum contamination in basaltic oligotrophic environments (54,55) such as Icelandic beach environments. Previously it has been demonstrated that the microbial activity in Icelandic soils is more affected by substrate availability than temperature (50,51), wich means the possibility of bioremediative strategies like biostimulation is quite possible.…”

Section: Bioremediative Potential Of Isolated Bacterial Strainsmentioning

confidence: 99%

Gas seepage pockmark microbiomes suggest the presence of sedimentary coal seams in the Öxarfjörður graben of northeastern Iceland

et al. 2020

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Natural gas seepage pockmarks are found off- and onshore in the Öxarfjörður graben, Iceland. The bacterial communities of two onshore seepage sites were analysed by 16S rRNA gene amplicon sequencing; the geochemical characteristics, hydrocarbon content, and the carbon isotope composition of the sites were also determined. While one site was found to be characterised by biogenic origin of methane gas, with a carbon isotope ratio (δ13C (‰)) of −63.2, high contents of organic matter and complex hydrocarbons, the other site showed a mixed origin of the methane gas (δ13C (‰) = −26.6) with geothermal characteristics and lower organic matter content. While both sites harboured Proteobacteria as the most abundant bacterial phyla, the Deltaproteobacteria were more abundant at the geothermal site and the Alphaproteobacteria at the biogenic site. The Dehalococcoidia class of phylum Chloroflexi was abundant at the geothermal site while the Anaerolineae class was more abundant at the biogenic site. Bacterial strains from the seepage pockmarks were isolated on a variety of selective media targeting bacteria with bioremediation potential. A total of 106 strains were isolated and characterised, including representatives from the phyla Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria. This article describes the first microbial study on gas seepage pockmarks in Iceland.

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Bacterial community composition of an urban river in the North West Province, South Africa, in relation to physico-chemical water quality

Jordaan

Bezuidenhout

2015

Environ Sci Pollut Res

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The aim of this study was to determine the impacts of anthropogenic disturbances on bacterial community composition in an urban river (Mooi River). Physico-chemical analysis, bacterial enumeration and 454-pyrosequencing were conducted on the Mooi River system upstream and downstream of an urban settlement in the North West Province, South Africa. Pyrosequencing and multivariate analysis showed that nutrient inputs and faecal pollution strongly impacted the physico-chemical and microbiological quality at the downstream sites. Also, bacterial communities showed higher richness and evenness at the downstream sites. Multivariate analysis suggested that the abundances of Betaproteobacteria, Epsilonproteobacteria, Acidobacteria, Bacteroidetes and Verrucomicrobia are related to temperature, pH, dissolved oxygen (DO), sulphate and chlorophyll-a levels. These results suggest that urbanisation caused the overall water quality of this river to deteriorate, which in turn affected the bacterial community composition. In addition, our work identified potential indicator groups that may be used to track faecal and organic pollution in freshwater systems.

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The natural and anthropogenic microbiota of Glerá, a sub-arctic river in northeastern Iceland

Cited by 12 publications

References 65 publications

Exploration of social spreading reveals behavior is prevalent amongPedobacterandP. fluorescensisolates, and shows variations in induction of phenotype

Exploration of social spreading reveals behavior is prevalent amongPedobacterandP. fluorescensisolates, and shows variations in induction of phenotype

Gas seepage pockmark microbiomes suggest the presence of sedimentary coal seams in the Öxarfjörður graben of northeastern Iceland

Bacterial community composition of an urban river in the North West Province, South Africa, in relation to physico-chemical water quality

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