scholarly journals Planktonic community structure determines the fate of bacterial production in a temperate lake

1990 ◽  
Vol 35 (4) ◽  
pp. 795-808 ◽  
Author(s):  
Michael L. Pace ◽  
George B. McManus ◽  
Stuart E. G. Findlay
Keyword(s):  
Community Structure ◽  
Bacterial Production ◽  
Temperate Lake ◽  
Planktonic Community

Horizontal variability and regulation of bacterial production in a large, temperate lake

2020 ◽  
Author(s):  
Kenji Tsuchiya ◽  
Noriko Tomioka ◽  
Kazuhiro Komatsu ◽  
Tomoharu Sano ◽  
Ayato Kohzu ◽  
...  
Keyword(s):  
Bacterial Production ◽  
Temperate Lake

scholarly journals Short scale variations in nutrients, ectoenzymatic activities and bottom-up effects on bacterial production and community structure during late summer-autumn transition in the open NW Mediterranean Sea

2009 ◽  
Vol 6 (1) ◽  
pp. 687-727 ◽  
Author(s):  
F. Van Wambeke ◽  
J-F. Ghiglione ◽  
J. Nedoma ◽  
G. Mével ◽  
P. Raimbault
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Mediterranean Sea ◽  
Mixed Layer ◽  
Bacterial Production ◽  
Bacterial Community Structure ◽  
Late Summer ◽  
Bottom Up ◽  
Nw Mediterranean ◽  
Nw Mediterranean Sea

Abstract. We examined the vertical and temporal dynamics of nutrients, ectoenzymatic activities under late summer-fall transition period (September–October 2004) in NW Mediterranean Sea in relation to temporal change in factors limiting bacterial production. The depth of the mixed layer (12.8±5.3 m) was extremely stable until the onset of the destratification period after 11 October, creating a zone where diffusion of nutrient from the much deeper phosphacline (69±12 m) and nitracline (50±8 m) was probably strongly limited. However during the second half of the cruise, a shallowing of nutriclines occured, particularly marked for nitracline. Hence, the nitrate to phosphate ratio within the mixed layer, although submitted to a high short term variability, shifted the last week of the cruise from 1.1±1.2 to 4.6±3.8, and nitrate increased by a factor 2 (0.092±0.049 μM). A corresponding switch from more than one limitation (PN) to P-only limitation of bacterial production was observed during the month as detected by enrichment bioassays. Differences in the identity of the limiting nutrient in surface (5 m: N and P at the beginning, strictly P at the end of the study) versus 80 m (labile carbon) influence greatly bacterial community structure shift between these two layers. The two communities (5 and 80 m) reacted rapidly (24 h) to changes in nutrient concentrations by drastic modification of total and active population assemblages resulting in changes in activity. For bacterial production values less than 10 ng C l−1h−1 (associated to deeper layers), aminopeptidase and lipase exhibited higher activity relative to production whereas phosphatase varied in the same proportions than BP on the range of activities tested. Our results illustrate the effect of bottom-up control on bacterial community structure and activities in the epipelagic NW Mediterranean Sea.

scholarly journals RuBisCO large subunit gene primers for assessing the CO2-assimilating planktonic community structure in Jiaozhou Bay, China

2018 ◽  
Vol 365 (14) ◽  
Author(s):  
Xiang-Qun Chi ◽  
Long Wang ◽  
Ruoyu Guo ◽  
Dexi Zhao ◽  
Jia Li ◽  
...  
Keyword(s):  
Community Structure ◽  
Large Subunit ◽  
Jiaozhou Bay ◽  
Subunit Gene ◽  
Planktonic Community

Short-term changes in planktonic community structure and nitrogen transfers in a coastal upwelling system

1989 ◽  
Vol 29 (2) ◽  
pp. 131-150 ◽  
Author(s):  
W.F. Vincent ◽  
F.H. Chang ◽  
A. Cole ◽  
M.T. Downes ◽  
M.R. James ◽  
...  
Keyword(s):  
Community Structure ◽  
Coastal Upwelling ◽  
Short Term ◽  
Upwelling System ◽  
Planktonic Community

scholarly journals Changes in the planktonic community structure related to trophic conditions: The case study of the northern Adriatic Sea

2012 ◽  
Vol 96-97 ◽  
pp. 95-102 ◽  
Author(s):  
Dragica Fuks ◽  
Ingrid Ivančić ◽  
Mirjana Najdek ◽  
Davor Lučić ◽  
Jakica Njire ◽  
...  
Keyword(s):  
Community Structure ◽  
Adriatic Sea ◽  
Northern Adriatic Sea ◽  
Trophic Conditions ◽  
Northern Adriatic ◽  
Planktonic Community

scholarly journals Detection of sulfate-reducing bacteria as an indicator for successful mitigation of sulfide production

2021 ◽  
Author(s):  
Avishek Dutta ◽  
Fernando Valle ◽  
Thomas Goldman ◽  
Jeff Keating ◽  
Ellen Burke ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Critical Time ◽  
Sulfate Reducing Bacteria ◽  
Time Points ◽  
Sulfate Reducing ◽  
Nitrate Treatment ◽  
Reducing Bacteria ◽  
Planktonic Community

Sulfate-reducing bacteria (SRB) are one of the main sources of biogenic H 2 S generation in oil reservoirs. Excess H 2 S production in these systems leads to oil biosouring, which causes operational risks, health hazards and can increase the cost of refining crude oil. Nitrate salts are often added to the system to suppress sulfidogenesis. Because SRB populations can persist in biofilms even after nitrate treatment, identifying shifts in the sessile community is crucial for successful mitigation. However, sampling the sessile community is hampered by its inaccessibility. Here we use the results of a long-term (148 days) ex situ experiment to identify particular sessile community members from observations of the sample waste stream. Microbial community structure was determined for 731 samples across twenty bioreactors using 16S rRNA gene sequencing. By associating microbial community structure with specific steps in the mitigation process, we could distinguish between taxa associated with H 2 S production and mitigation. After initiation of nitrate treatment, certain SRB populations increased in the planktonic community during critical time points, indicating the dissociation of SRBs from the biofilm. Predicted relative abundances of the dissimilatory sulfate reduction pathway also increased during the critical time points. Here, by analyzing the planktonic community structure, we describe a general method that uses high-throughput amplicon sequencing, metabolic inferences, and cell abundance data to identify successful biofilm mitigation. We anticipate that our approach is also applicable to other systems where biofilms must be mitigated but cannot be easily sampled. Importance Microbial biofilms are commonly present in many industrial processes and can negatively impact performance and safety. Within the oil industry, subterranean biofilms cause biosouring with implications for oil quality, cost, occupational health, and the environment. Because these biofilms cannot be directly sampled, methods are needed to indirectly assess the success of mitigation measures. This study demonstrates how the planktonic microbial community can be used to assess the dissociation of SRB-containing biofilms. We found that an increase in the abundance of a specific SRB population in the effluent after nitrate treatment can be used as a potential indicator for the successful mitigation of biofilm-forming SRBs. Moreover, a method for determining critical time points for detecting potential indicators is suggested. This study expands our knowledge in improving mitigation strategies for biosouring and could have broader implications in other systems where biofilms lead to adverse consequences.

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