Calcium is required for ixotrophy of Aureispira sp. CCB-QB1

Furusawa, Go; Hartzell, Patricia L.; Navaratnam, V.

doi:10.1099/mic.0.000158

Cited by 14 publications

(18 citation statements)

References 32 publications

(43 reference statements)

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“…Foam samples from our study contained bacterial OTUs likely capable of producing SAS, as previously demonstrated for Vibrio and Pseudoalteromonas (Dang, et al 2016;Hu, et al 2015). Moreover, Saprospira found in Trichodesmium-associated foam can produce sticky substances such as acidic polysaccharides, which enhance aggregate formation (Furusawa, et al 2015). We further speculate that in the Jade Bay, foam formation could be additionally supported by blooming Phaeocystis sp.…”

Section: The Role Of Particles For Foam-populating Bacteria and Biogesupporting

confidence: 81%

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Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

Rahlff

Stolle

Giebel

et al. 2019

Preprint

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The occurrence of foams at oceans’ surfaces is patchy and generally short-lived. However, a detailed understanding of bacterial communities inhabiting foams is lacking. In this study, we investigate if marine foams differ from the sea-surface microlayer (SML), a <1 mm thick layer at the air-sea interface. The comparison of marine foams, SML and underlying water collected from the North Sea and Timor Sea showed that foams were often characterized by highest abundance of small phototrophic and prokaryotic cells as well as highest concentrations of surface-active substances (SAS). Amplicon sequencing based on 16S rRNA revealed a comparable bacterial community in SML and foam. DNA and rRNA based sequence data suggest that Pseudoalteromonas, a typical member of the SML, was highly active and thus might enhance foam formation and stability by producing SAS. Although foams contained some specific taxa, our study supports the hypothesis that foam represents a compressed version of the SML. Foam is characterized by increased cell numbers, high SAS concentration, and a significant fraction of overlapping bacteria with SML. Due to the compressed nature of foam and SML compared to the underlying water, bacteria thriving in both surface phenomena have likely implications for biogeochemical cycling and air-sea exchange processes.One-sentence summaryWhile foams at the oceans’ surface have a unique bacterial community signature, they represent a compressed version of the sea-surface microlayer with typical bacterial inhabitants.

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Section: The Role Of Particles For Foam-populating Bacteria and Biogesupporting

confidence: 81%

“…2015). Moreover, Saprospira found in Trichodesmium -associated foam can produce sticky substances such as acidic polysaccharides, which enhance aggregate formation (Furusawa, et al . 2015).…”

Section: Discussionmentioning

confidence: 99%

Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

Rahlff

Stolle

Giebel

et al. 2019

Preprint

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“…There is also evidence that members of the Aureispira prey on Vibrio sp. in a process linked with the availability of calcium ions (45) and thus may help to counter an increasing abundance of opportunistic bacteria (46).…”

Section: Discussionmentioning

confidence: 99%

Fast and pervasive transcriptomic resilience and acclimation of extremely heat-tolerant coral holobionts from the northern Red Sea

Savary

Barshis

Voolstra

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Corals from the northern Red Sea and Gulf of Aqaba exhibit extreme thermal tolerance. To examine the underlying gene expression dynamics, we exposed Stylophora pistillata from the Gulf of Aqaba to short-term (hours) and long-term (weeks) heat stress with peak seawater temperatures ranging from their maximum monthly mean of 27 °C (baseline) to 29.5 °C, 32 °C, and 34.5 °C. Corals were sampled at the end of the heat stress as well as after a recovery period at baseline temperature. Changes in coral host and symbiotic algal gene expression were determined via RNA-sequencing (RNA-Seq). Shifts in coral microbiome composition were detected by complementary DNA (cDNA)-based 16S ribosomal RNA (rRNA) gene sequencing. In all experiments up to 32 °C, RNA-Seq revealed fast and pervasive changes in gene expression, primarily in the coral host, followed by a return to baseline gene expression for the majority of coral (>94%) and algal (>71%) genes during recovery. At 34.5 °C, large differences in gene expression were observed with minimal recovery, high coral mortality, and a microbiome dominated by opportunistic bacteria (including Vibrio species), indicating that a lethal temperature threshold had been crossed. Our results show that the S. pistillata holobiont can mount a rapid and pervasive gene expression response contingent on the amplitude and duration of the thermal stress. We propose that the transcriptomic resilience and transcriptomic acclimation observed are key to the extraordinary thermal tolerance of this holobiont and, by inference, of other northern Red Sea coral holobionts, up to seawater temperatures of at least 32 °C, that is, 5 °C above their current maximum monthly mean.

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“…These events potentially stimulated secondary consumers such as Aureispira, which only appeared after 60 h (Kruskal-Wallis test, p = 0.01). This predatory taxon can feed on metabolic products or cell debris from other bacteria, fueled by its capacity to adhere to anionic polysaccharides [85]. On PecP, a single MAG affiliated with Catenovulum accounted for the vast majority of differentially abundant transcripts, supporting the predisposition of this taxon towards pectin (see below).…”

Section: Do Algp Pecp and Fl Communities Differ In Functional Diversmentioning

confidence: 89%

Sweet and magnetic: Succession and CAZyme expression of marine bacterial communities encountering a mix of alginate and pectin particles

Bunse

Koch

Breider

et al. 2020

Preprint

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Polysaccharide particles are an important nutrient source and microhabitat for marine bacteria. However, substrate-specific bacterial dynamics in a mixture of particle types with different polysaccharide composition, as likely occurring in natural habitats, are undescribed. Here, we studied the composition, functional diversity and gene expression of marine bacterial communities encountering a mix of alginate and pectin particles. Communities were collected above macroalgal forests near Helgoland Island − where polysaccharide-rich particles might regularly occur − and exposed to a mix of magnetic particles of each polysaccharide, allowing the targeted evaluation by particle type. Amplicon, metagenome and metatranscriptome sequencing revealed that particle-associated (PA) and free-living (FL) communities significantly differed in composition and metabolism, whereas dynamics on alginate and pectin particles were unexpectedly similar. Amplicon sequence variants (ASVs) from Tenacibaculum, Colwellia, Psychrobium and Psychromonas dominated the community on both particle types. Corresponding metagenome-assembled genomes (MAGs) expressed diverse alginate lyases, several co-localized in polysaccharide utilization loci. One low-abundance MAG related to Catenovulum showed pectin specialization through upregulated GH53 and GH105 genes. A single Glaciecola ASV dominated the FL fraction, likely persisting on particle-derived oligomers through different glycoside hydrolases. The bacterial preference for alginate, whereas pectin mainly served as colonization scaffold, illuminates substrate-driven microbial dynamics within mixed polysaccharide resources. Moreover, elevated ammonium metabolism signifies nitrogen availability as important factor on particles, whereas elevated methylcitrate and glyoxylate cycles illustrate nutrient-limited conditions in the surrounding water. These insights expand our understanding of bacterial microscale ecology, niche specialization and the biological carbon pump in macroalgae-rich habitats.

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Calcium is required for ixotrophy of Aureispira sp. CCB-QB1

Cited by 14 publications

References 32 publications

Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

Fast and pervasive transcriptomic resilience and acclimation of extremely heat-tolerant coral holobionts from the northern Red Sea

Sweet and magnetic: Succession and CAZyme expression of marine bacterial communities encountering a mix of alginate and pectin particles

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