Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Zubkov, Mikhail V.; Fuchs, Bernhard M.; Tarran, Glen A.; Burkill, Peter H.; Amann, Rudolf

doi:10.3354/ame029135

Cited by 54 publications

(60 citation statements)

References 44 publications

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“…To our knowledge, Spall & Richards (2000) provided a unique study focused on the effects of mesoscale vertical and horizontal eddies on the distribution of bacteria by a realistic physical/ecosystem numerical model. Although there are many studies on patchiness of phytoplankton and bacterial abundance on the scale of 100 km (Robarts et al 1996, Nagata et al 2000, Martin 2003, only a few studies have demonstrated the mesoscale spatial heterogeneity in bacterial community composition (the northern North Sea; Zubkov et al 2002). These spatial gradients at this spatial scale are necessary for effective advection and diffusion among local prokaryotic communities by mesoscale eddies.…”

Section: Discussionmentioning

confidence: 99%

Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Miki¹,

Yokokawa²,

Nagata³

et al. 2008

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Miki¹,

Yokokawa²,

Nagata³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…This group dominated the high nucleic acid, that is, the most active fraction, of the bacterioplankton during an E. huxleyi bloom in the northern North Sea (Zubkov et al, 2002) and also largely dominated the glucose uptake in the German Bight, as shown by microautoradiography coupled to fluorescent in situ hybridization (Alonso and Pernthaler, 2006). We only assessed the abundance of the RCA cluster and not that of the entire Roseobacter group because it is not possible to reliably target this entire group by a qPCR assay.…”

Section: Discussionmentioning

confidence: 99%

“…The RCA cluster with a sequence similarity of the 16S ribosomal RNA (rRNA) gene of 498% was identified as a prominent component of the bacterioplankton in the southern North Sea (Selje et al, 2004). The only study in the northern North Sea has been carried out during an Emiliana huxleyi bloom (Zubkov et al, 2001(Zubkov et al, , 2002, showing that the above-mentioned major phylogenetic groups constituted the bacterioplankton community to a great extent and that one phylotype of the Roseobacter group dominated the consumption of dimethylsulfonium propionate.…”

Section: Introductionmentioning

confidence: 99%

Distribution of Roseobacter RCA and SAR11 lineages in the North Sea and characteristics of an abundant RCA isolate

et al. 2010

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The Roseobacter group and SAR11 clade constitute high proportions of the marine bacterioplankton, but only scarce information exists on the abundance of distinct populations of either lineage. Therefore, we quantified the abundance of the largest cluster of the Roseobacter group, the RCA (Roseobacter clade affiliated) cluster together with the SAR11 clade by quantitative PCR in the southern and eastern North Sea. The RCA cluster constituted up to 15 and 21% of total bacterial 16S ribosomal RNA (rRNA) genes in September 2005 and May 2006, respectively. At a few stations, the RCA cluster exceeded the SAR11 clade, whereas at most stations, SAR11 constituted higher fractions with maxima of 37%. In most samples, only one RCA ribotype was detected. RCA abundance was positively correlated with phaeopigments, chlorophyll, dissolved and particulate organic carbon (POC), turnover rates of dissolved free amino acids (DFAAs), temperature, and negatively correlated with salinity. The SAR11 clade was only correlated with POC (negatively, May) and with DFAA turnover rates (positively, September). An abundant RCA strain, 'Candidatus Planktomarina temperata', was isolated from the southern North Sea. This strain has an identical 16S rRNA gene sequence to the dominant RCA ribotype. Detection of the pufM gene, coding for a subunit of the reaction center of bacteriochlorophyll a, indicates the potential of the isolate for aerobic anoxygenic photosynthesis. Our study shows that a distinct population of the RCA cluster constitutes an abundant bacterioplankton group in a neritic sea of the temperate zone and indicates that this population has an important role during decaying phytoplankton blooms.

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“…Abundance of heterotrophic bacteria was determined after staining with SYBR Green I DNA dye (40,41). Yellow-green beads of 0.5-μm diameter (Fluoesbrite Microparticles; Polysciences) were used in all analyses as an internal standard for both fluorescence and flow rates (42). Coccolithophore cell volumes were calculated using simple geometric shapes and converted to carbon (mg C m −3 )…”

Section: Methodsmentioning

confidence: 99%

Ocean acidification and marine trace gas emissions

Hopkins

Turner

Nightingale

et al. 2009

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

119

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The oceanic uptake of man-made CO 2 emissions is resulting in a measureable decrease in the pH of the surface oceans, a process which is predicted to have severe consequences for marine biological and biogeochemical processes [Caldeira K, Wickett ME (2003) Nature 425:365; The Royal Society (2005) Policy Document 12 /05 (Royal Society, London)]. Here, we describe results showing how a doubling of current atmospheric CO 2 affects the production of a suite of atmospherically important marine trace gases. Two CO 2 treatments were used during a mesocosm CO 2 perturbation experiment in a Norwegian fjord (present day: ∼380 ppmv and year 2100: ∼750 ppmv), and phytoplankton blooms were stimulated by the addition of nutrients. Seawater trace gas concentrations were monitored over the growth and decline of the blooms, revealing that concentrations of methyl iodide and dimethylsulfide were significantly reduced under high CO 2. Additionally, large reductions in concentrations of other iodocarbons were observed. The response of bromocarbons to high CO 2 was less clear cut. Further research is now required to understand how ocean acidification might impact on global marine trace gas fluxes and how these impacts might feed through to changes in the earth's future climate and atmospheric chemistry.dimethylsulfide | halocarbons | atmospheric chemistry | climate

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Mesoscale distribution of dominant bacterioplankton groups in the northern North Sea in early summer

Cited by 54 publications

References 44 publications

Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Distribution of Roseobacter RCA and SAR11 lineages in the North Sea and characteristics of an abundant RCA isolate

Ocean acidification and marine trace gas emissions

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