Vertical distribution of number, biomass and size-class spectrum of bacteria in relation to oxic/anoxic conditions in the Central Baltic Sea

Gast, V.; Gocke, Klaus

doi:10.3354/meps045179

Cited by 45 publications

(33 citation statements)

References 16 publications

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“…Furthermore, low cellular activity was observed in the water below the interface from 150 m downward (Figure 2c). This low activity contrasts with a bacterial cell volume that is in the anoxic layer by a factor of three higher than in the oxic water (Gast and Gocke, 1988) coinciding with a high cell number. This increased 'anoxic' biovolume has also been reported from a survey of lakes, where in anoxic hypolimnia the bacterial biomass exceeded those of oxic hypolimia by a factor of four, irrespective of environmental factors such as the trophic state or temperature (Cole et al, 1993).…”

Section: Utility Of Cordaf For the Understanding Of Bacterial Communimentioning

confidence: 61%

Analysis of bacterial core communities in the central Baltic by comparative RNA–DNA-based fingerprinting provides links to structure–function relationships

2011

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Understanding structure-function links of microbial communities is a central theme of microbial ecology since its beginning. To this end, we studied the spatial variability of the bacterioplankton community structure and composition across the central Baltic Sea at four stations, which were up to 450 km apart and at a depth profile representative for the central part (Gotland Deep, 235 m). Bacterial community structure was followed by 16S ribosomal RNA (rRNA)-and 16S rRNA gene-based fingerprints using single-strand conformation polymorphism (SSCP) electrophoresis. Species composition was determined by sequence analysis of SSCP bands. High similarities of the bacterioplankton communities across several hundred kilometers were observed in the surface water using RNA-and DNA-based fingerprints. In these surface communities, the RNA-and DNA-based fingerprints resulted in very different pattern, presumably indicating large difference between the active members of the community as represented by RNA-based fingerprints and the present members represented by the DNA-based fingerprints. This large discrepancy changed gradually over depth, resulting in highly similar RNA-and DNA-based fingerprints in the anoxic part of the water column below 130 m depth. A conceivable mechanism explaining this high similarity could be the reduced oxidative stress in the anoxic zone. The stable communities on the surface and in the anoxic zone indicate the strong influence of the hydrography on the bacterioplankton community structure. Comparative analysis of RNA-and DNA-based community structure provided criteria for the identification of the core community, its key members and their links to biogeochemical functions. The ISME Journal (2012) 6, 195-212; doi:10.1038/ismej.2011; published online 23 June 2011Subject Category: microbial ecology and functional diversity of natural habitats

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Section: Utility Of Cordaf For the Understanding Of Bacterial Communimentioning

confidence: 61%

Analysis of bacterial core communities in the central Baltic by comparative RNA–DNA-based fingerprinting provides links to structure–function relationships

2011

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“…4) indicates that the cold winter water layer of the Landsort Deep does not support abundant planktonic life. Based on microscopy, similar observations have been made for the cold winter water layers of the Gotland, Bornholm, and Gdansk basins (Gast and Gocke (1988) and citations therein).…”

Section: Heterotrophs In the Cold Winter Water Layermentioning

confidence: 62%

“…However, some ciliates seem to prefer prokaryotes as a prey. Sinking agglomerates of cyanobacteria and other bacteria are known to be covered by feeding ciliates (Gast and Gocke, 1988). Hence, in addition to R. palustris, ciliates grazing selectively on cyanobacteria would plausibly explain the abundance of tetrahymanol in the shallow waters of the Landsort Deep.…”

Section: Phototrophic Vs Heterotrophic Dinoflagellates and Ciliatesmentioning

confidence: 99%

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

et al. 2014

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Abstract. The water column of the Landsort Deep, central Baltic Sea, is stratified into an oxic, suboxic, and anoxic zone. This stratification controls the distributions of individual microbial communities and biogeochemical processes. In summer 2011, particulate organic matter was filtered from these zones using an in situ pump. Lipid biomarkers were extracted from the filters to establish water-column profiles of individual hydrocarbons, alcohols, phospholipid fatty acids, and bacteriohopanepolyols (BHPs). As a reference, a cyanobacterial bloom sampled in summer 2012 in the central Baltic Sea Gotland Deep was analyzed for BHPs. The biomarker data from the surface layer of the oxic zone showed major inputs from cyanobacteria, dinoflagellates, and ciliates, while the underlying cold winter water layer was characterized by a low diversity and abundance of organisms, with copepods as a major group. The suboxic zone supported bacterivorous ciliates, type I aerobic methanotrophic bacteria, sulfate-reducing bacteria, and, most likely, methanogenic archaea. In the anoxic zone, sulfate reducers and archaea were the dominating microorganisms as indicated by the presence of distinctive branched fatty acids: archaeol and pentamethylicosane (PMI) derivatives, respectively. Our study of in situ biomarkers in the Landsort Deep thus provided an integrated insight into the distribution of relevant compounds and describes useful tracers to reconstruct stratified water columns in the geological record.

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“…As early as 1969, Seppanen & Voipio (1971) studied the vertical distribution of different types of bacteria at the Gotland Deep (250 m) in the Central Baltic Sea, and found a correlation between bacteriological and physico-chemical parameters. This interesting area with distinctive hydrographical characteristics -oxic water down to a depth of about 100 m, with an underlying transition zone and anoxic water -was also studied by Gast & Gocke (1988). They demonstrated the change in the bacterial population associated with the transition from oxic to anoxic conditions.…”

Section: Introductionmentioning

confidence: 99%

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

Heinänen¹

1991

Mar. Ecol. Prog. Ser.

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Bacterial numbers, biomass and productivity were studied during 2 cruises in the Baltic Proper, Gulf of Finland and the Bothnian Sea. Bacterial populations in the open sea area had longer turnover times and lower productivity than in coastal areas, comparable to those found in the open ocean, but their biomass and abundance were as high as in the coastal areas of the Baltic Sea. High bacterial productivity in the aphotic water layer in the Gulf of Finland is suggested to indicate eutrophication of this area.

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Vertical distribution of number, biomass and size-class spectrum of bacteria in relation to oxic/anoxic conditions in the Central Baltic Sea

Cited by 45 publications

References 16 publications

Analysis of bacterial core communities in the central Baltic by comparative RNA–DNA-based fingerprinting provides links to structure–function relationships

Analysis of bacterial core communities in the central Baltic by comparative RNA–DNA-based fingerprinting provides links to structure–function relationships

Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

Bacterial numbers, biomass and productivity in the Baltic Sea: a cruise study

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