Diversity and Distribution of
            <i>Planctomycetes</i>
            and Related Bacteria in the Suboxic Zone of the Black Sea

Kirkpatrick, John B.; Oakley, Brian B.; Fuchsman, Clara A.; Srinivasan, Sujatha; Staley, James T.; Murray, James

doi:10.1128/aem.72.4.3079-3083.2006

Cited by 78 publications

(72 citation statements)

References 33 publications

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“…We defined the 10 mmol L 21 as upper limit of the suboxic zone as previously suggested upper limit for the activity of denitrifiers in general (Tiedje 1994) as well as for the Black Sea (Kirkpatrick et al 2006). Surprisingly, none of our 15 N incubations with suboxic water samples showed a production of 15 N 15 N, which would be characteristic for denitrification (Figs.…”

Section: Discussionmentioning

confidence: 99%

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Hannig

Lavik

Kuypers

et al. 2007

Limnology & Oceanography

110

120

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Incubation experiments with 15 N-labeled compounds (NO { 3 and NH z 4 ) were performed during three cruises (2002, 2004, and 2005) to study the loss of inorganic N as dinitrogen gas (N 2 ) via denitrification and anammox in the water column of the Gotland Deep (central Baltic Sea). 15 N incubations did not provide evidence for direct conversion of NO { 3 reduction to N 2 (heterotrophic denitrification) in the suboxic (O 2 , 10 mmol L 21 ) sulfide-free waters. Substantial denitrification rates (up to 2.7 mmol L 21 d 21 N 2 ) were measured in water samples collected from the NO

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Section: Discussionmentioning

confidence: 99%

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Hannig

Lavik

Kuypers

et al. 2007

Limnology & Oceanography

110

120

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“…The effects of nutrient additions on bacterial communities and on dominant bacterial phyla have been studied extensively and are now well known (33,34,35,36,37,38). However, while empirical studies suggest different responses of members of Planctomycetes to nutrients (1,15), the impacts of the inorganic-nutrient supply on members of this nondominant but ecologically and functionally important bacterial phylum remain unknown. Because we showed in our previous study (1) that Planctomycetes communities are structured similarly to the entire bacterial community, i.e., characterized by the existence of few dominant OTUs and numerous rare OTUs, we predicted that inorganic-nutrient amendments could have similar impacts on the two communities.…”

Section: Discussionmentioning

confidence: 99%

“…In many cases in that study, the increase in Planctomycetes abundances was greater than (N addition) or similar to those of dominant groups, such as betaproteobacteria (6). The few studies reporting on factors that might control Planctomycetes members also suggest an important role for inorganic nutrients (1,15). For instance, different vertical distributions of Planctomycetes genera were reported in the suboxic zone of the Black Sea in relation to nitrate versus ammonium concentrations (15).…”

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confidence: 99%

“…The few studies reporting on factors that might control Planctomycetes members also suggest an important role for inorganic nutrients (1,15). For instance, different vertical distributions of Planctomycetes genera were reported in the suboxic zone of the Black Sea in relation to nitrate versus ammonium concentrations (15). Recently, we have also found in two perialpine lakes that variations in the number of genetic sequences belonging to dominant Planctomycetes phylotypes were mainly explained by nitrate and the ratio of inorganic N to inorganic P (1).…”

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confidence: 99%

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Planctomycetes in Lakes: Poor or Strong Competitors for Phosphorus?

Pollet

Humbert

Tadonléké

2014

Appl Environ Microbiol

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bExperiments were conducted with water samples from two perialpine lakes with differing eutrophication status in order to examine the effects of inorganic-nutrient amendments (nitrogen as NO 3 ؊ or NH 4 ؉ and phosphorus as PO 4 3؊ ) on the dynamics, structure, and composition of Planctomycetes and to test the hypothesis that the community structure of Planctomycetes members and that of the other bacteria (without Planctomycetes, here referred to as bacteria-wP, the most represented groups within the community) would be similarly impacted by nutrient additions. Initial samples were characterized by high total nitrogen-tototal phosphorus ratios (range, 39 to 55), suggesting P rather than N was the limiting nutrient for microbial communities. Consistent with this, P additions stimulated phytoplankton growth and affected the community structure of bacteria-wP but, surprisingly, not that of Planctomycetes. N additions did not significantly affect the community structures of bacteria-wP and Planctomycetes or the Planctomycetes phylotype composition. The estimated generation time of Planctomycetes was 123 h. These findings could suggest that the generally well-accepted statement that bacteria (as a whole) are superior to phytoplankton in the ability to obtain phosphorus under P limitation might actually not hold for Planctomycetes. Planctomycetes might be poor competitors for P that do not respond quickly to the nutrient supply, which may help explain why their abundance is low in aquatic systems. The alternative view that Planctomycetes could be strong competitors for P (storing it) is also discussed. Our findings highlight the need for further studies examining Planctomycetes-phosphorus relationships in aquatic ecosystems.

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“…2a). The suboxic zone is the biochemical transition zone between oxic layers and sulfidic deep waters with dissolved oxygen concentrations <10 µM (Kirkpatrick et al, 2006). Oxygen was below the detection limit (1 µM) starting at a depth of 220 m. Sulfide (S 2− ) was detected below a depth of 225 m, reaching its maximum of 3.2 µM at 230 m. Thus, the suboxic zone was located between water depths of 220 and 225 m. While nitrate (NO In the coastal sediment sample O 2 concentration decreased rapidly from 300 µM to 0 within the top 2 mm (Fig.…”

Section: Field Measurementsmentioning

confidence: 99%

<I>nirS</I>-containing denitrifier communities in the water column and sediment of the Baltic Sea

Falk

Hannig

Gliesche³

et al. 2007

Biogeosciences

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Abstract. The aim of this study was to compare structural differences in the nirS-type denitrifying microbial communities along the environmental gradients observed in the water column and coastal sediments of the Baltic Sea. To link community structure and environmental gradients, denitrifier communities were analyzed by terminal restriction fragment length polymorphism (T-RFLP) based on nirS as a functional marker gene for denitrification. nirS-type denitrifier community composition was further evaluated by phylogenetic analysis of nirS sequences from clone libraries. T-RFLP analysis indicated some overlap but also major differences between communities from the water column and the sediment. Shifts in community composition along the biogeochemical gradients were observed only in the water column while denitrifier communities were rather uniform within the upper 30 mm of the sediment. Specific terminal restriction fragments (T-RFs) indicative of the sulfidic zone suggest the presence of nitrate-reducing and sulfide-oxidizing microorganisms that were previously shown to be important at the suboxic-sulfidic interface in the water column of the Baltic Sea. Phylogenetic analysis of nirS genes from the Baltic Sea and of sequences from marine habitats all over the world indicated distinct denitrifier communities that grouped mostly according to their habitats. We suggest that these subgroups of denitrifiers had developed after selection through several factors, i.e. their habitats (water column or sediment), impact by prevalent environmental conditions and isolation by large geographic distances between habitats.

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Diversity and Distribution of Planctomycetes and Related Bacteria in the Suboxic Zone of the Black Sea

Cited by 78 publications

References 33 publications

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Planctomycetes in Lakes: Poor or Strong Competitors for Phosphorus?

<I>nirS</I>-containing denitrifier communities in the water column and sediment of the Baltic Sea

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Diversity and Distribution of Planctomycetes and Related Bacteria in the Suboxic Zone of the Black Sea

Cited by 78 publications

References 33 publications

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Shift from denitrification to anammox after inflow events in the central Baltic Sea

Planctomycetes in Lakes: Poor or Strong Competitors for Phosphorus?

&lt;I&gt;nirS&lt;/I&gt;-containing denitrifier communities in the water column and sediment of the Baltic Sea

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<I>nirS</I>-containing denitrifier communities in the water column and sediment of the Baltic Sea