The Family Rhodobacteraceae

Pujalte, María J.; Lucena, Teresa; Ruvira, María A.; Arahal, David R.; Macián, M. Carmen

doi:10.1007/978-3-642-30197-1_377

Cited by 281 publications

(261 citation statements)

References 488 publications

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“…Conversely, α-Proteobacteria belonging to the Rhodobacteraceae family was more abundant in Hunter River sites closest to the estuary mouth. These observations are consistent with typical planktonic microbial communities widely reported in marine and brackish estuarine environments (Liao et al 2007, Pujalte et al 2014. We suggest that the change in community structure and increase in spatial heterogeneity of bacterial assemblages in April were influenced by reduced freshwater inflow, allowing the reestablishment of a longitudinal salinity gradient across the tidal pool.…”

Section: Changes In Bacterial Community Composition During Inflow Eventssupporting

confidence: 90%

River bacterioplankton community responses to a high inflow event

Carney¹,

Mitrovic²,

Jeffries³

et al. 2015

Aquat. Microb. Ecol.

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Microbes drive chemical cycling and productivity within river ecosystems, but their influence may shift when intense allochthonous inputs accompany high freshwater inflow (flood) events. Investigating how floods influence microbial processes is fundamentally important for our understanding of river ecology, but is generally overlooked. We analysed bacterioplankton community composition (BCC) and abundance over 4 mo following an enormous flood event in the Hunter River, Australia, that resulted in a major fish kill. Concentrations of dissolved organic carbon (DOC) and inorganic nutrients (N and P) were up to 3 times higher during the flood event compared to prior and subsequent months. Bacterial cell abundances were up to 10 times higher at impacted sites during the flood event. Using Automated Ribosomal Intergenic Spacer Analysis we found significant shifts in BCC between the flood impacted month and subsequent months (p < 0.05). Distance linear modelling indicated that DOC and dissolved N and P correlated most strongly with BCC patterns during the high inflow, whereas community dynamics correlated most strongly with nitrogen oxides and ammonium during the river's recovery phase. 16S rRNA amplicon pyrosequencing revealed that common soil-associated and facultative anaerobic genera of Proteobacteria were most dominant during the flood period, suggesting that a proportion of the bacterial community observed during this event were potentially inactive soil microbes transported into the river via terrestrial runoff. During the recovery period, Cyanobacteria and freshwater-associated genera of Actinobacteria and Proteobacteria became dominant in 16S rRNA pyrosequencing profiles. These observations indicate that allochthonous nutrients delivered via floods can significantly stimulate bacterial growth, underpinning substrate-controlled succession of bacterial communities and ultimately shaping the ecology within river ecosystems.

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Section: Changes In Bacterial Community Composition During Inflow Eventssupporting

confidence: 90%

River bacterioplankton community responses to a high inflow event

Carney¹,

Mitrovic²,

Jeffries³

et al. 2015

Aquat. Microb. Ecol.

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“…The findings of high relative abundance of the four largely uncultivated lineages are remarkable if one considers that the 16S rRNA gene diverges only by 1% within lineages CHAB-I-5 and NAC11-7 (1), 2% within lineage DC5-80-3 (4), and up to 5% within lineage SAG-O19, falling well within nominal delineations of species or genus (46), compared to the described cultured roseobacters that have already reached ϳ200 species over ϳ70 genera (54). A previous study partitioned the cultured roseobacters into two lifestyle groups, those from pelagic oceans and those from associations with other organisms, surfaces, or sediments (17).…”

Section: Resultsmentioning

confidence: 98%

Ecological Genomics of the Uncultivated Marine Roseobacter Lineage CHAB-I-5

Zhang

Sun

Jiao

et al. 2016

Appl Environ Microbiol

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“…We found Betaproteobacteria at a lower proportion in deeper, more saline waters (Figure 8). Finer taxonomic identification indicated the presence of both marine and freshwater groups in the halocline, with peaks in the relative abundance of the typically-marine alphaproteobacterial Roseobacter-group (Pujalte et al, 2014) and the sometimes freshwater or ice-associated betaproteobacterium Polaromonas (Darcy et al, 2011). This latter taxon has also been reported from the water column beneath Antarctic sea-ice (Irgens et al, 1996), and it dominated the 5-m enrichment sample from Milne Fiord epishelf lake in 2007 (Veillette et al, 2011).…”

Section: Microbial Community Compositionmentioning

confidence: 90%

Microbial Community Structure and Interannual Change in the Last Epishelf Lake Ecosystem in the North Polar Region

et al. 2017

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Climate warming is proceeding rapidly in the polar regions, posing a threat to ice-dependent ecosystems. Among the most vulnerable are microbial-dominated epishelf lakes, in which surface ice-damming of an embayment causes a freshwater layer to overlie the sea, creating an interface between distinct habitats. We characterized the physicochemical and biotic environment of Milne Fiord epishelf lake (82 • N, Canada) in three successive summers (2010)(2011)(2012), and on one date of profiling (5 July 2011) we collected samples for high through-put amplicon sequencing of variable regions of small subunit rRNA to characterize the microbial community (Eukarya, Bacteria and Archaea). Potentially active water column communities were investigated using reverse-transcribed rRNA, and phytoplankton were further characterized by accessory pigment analysis. Cluster analysis of pigment data showed a demarcation between freshwater and marine communities, which was also evident in the sequence data. The halocline community of Eukarya was more similar to the deeper marine sample than to the freshwater surface community, while the Archaea and Bacteria communities at this interface clustered more with surface communities. In 2012, conductivity-depth profiles indicated shallowing of the freshwater layer and mixing across the halocline, accompanied by lower picocyanobacteria and higher picoeukaryote concentrations. Picocyanobacteria cells were more evenly distributed throughout the water column in 2012, implying partial deep mixing. Several mixotrophic taxa of Eukarya were more abundant in the freshwater layer, where low nutrient concentrations may favor this lifestyle. Unusual features of Milne Fiord microbial communities included benthic taxa not previously reported in marine water columns (notably, the archaeon Halobacteriales), and dominance by taxa that are typically present in sparse concentrations elsewhere: for example, the Chlorophyte group Radicarteria and the betaproteobacterium Rhodoferax.Thaler et al. Microbial Communities in an Ice-Dammed Arctic LakeMilne Fiord epishelf lake is the last known lake of this kind remaining in the Arctic, and the fate of this distinct microbial ecosystem may ultimately depend on the stability of the Milne Fiord ice shelf, which has experienced a negative mass balance over the past half century.

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The Family Rhodobacteraceae

Cited by 281 publications

References 488 publications

River bacterioplankton community responses to a high inflow event

River bacterioplankton community responses to a high inflow event

Ecological Genomics of the Uncultivated Marine Roseobacter Lineage CHAB-I-5

Microbial Community Structure and Interannual Change in the Last Epishelf Lake Ecosystem in the North Polar Region

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