Seasonal and spatial methane dynamics in the water column of the central Baltic Sea (Gotland Sea)

2014 ◽  
Vol 91 ◽  
pp. 12-25 ◽  
Author(s):  
G. Jakobs ◽  
P. Holtermann ◽  
C. Berndmeyer ◽  
G. Rehder ◽  
M. Blumenberg ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
Methane Dynamics

scholarly journals Denitrification in the water column of the central Baltic Sea

2013 ◽  
Vol 106 ◽  
pp. 247-260 ◽  
Author(s):  
Tage Dalsgaard ◽  
Loreto De Brabandere ◽  
Per O.J. Hall
Keyword(s):  
Baltic Sea ◽  
Water Column

scholarly journals Bacteriohopanepolyols record stratification, nitrogen fixation and other biogeochemical perturbations in Holocene sediments of the central Baltic Sea

2013 ◽  
Vol 10 (4) ◽  
pp. 2725-2735 ◽  
Author(s):  
M. Blumenberg ◽  
C. Berndmeyer ◽  
M. Moros ◽  
M. Muschalla ◽  
O. Schmale ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
Stable Stratification ◽  
The Baltic Sea ◽  
Allochthonous Input ◽  
The North ◽  
Water Column Stratification ◽  
Gotland Deep ◽  
History Of ◽  
The Baltic

Abstract. The Baltic Sea, one of the world's largest brackish-marine basins, established after deglaciation of Scandinavia about 17 000 to 15 000 yr ago. In the changeable history of the Baltic Sea, the initial freshwater system was connected to the North Sea about 8000 yr ago and the modern brackish-marine setting (Littorina Sea) was established. Today, a relatively stable stratification has developed in the water column of the deep basins due to salinity differences. Stratification is only occasionally interrupted by mixing events, and it controls nutrient availability and growth of specifically adapted microorganisms and algae. We studied bacteriohopanepolyols (BHPs), lipids of specific bacterial groups, in a sediment core from the central Baltic Sea (Gotland Deep) and found considerable differences between the distinct stages of the Baltic Sea's history. Some individual BHP structures indicate contributions from as yet unknown redoxcline-specific bacteria (bacteriohopanetetrol isomer), methanotrophic bacteria (35-aminobacteriohopanetetrol), cyanobacteria (bacteriohopanetetrol cyclitol ether isomer) and from soil bacteria (adenosylhopane) through allochthonous input after the Littorina transgression, whereas the origin of other BHPs in the core has still to be identified. Notably high BHP abundances were observed in the deposits of the brackish-marine Littorina phase, particularly in laminated sediment layers. Because these sediments record periods of stable water column stratification, bacteria specifically adapted to these conditions may account for the high portions of BHPs. An additional and/or accompanying source may be nitrogen-fixing (cyano)bacteria, which is indicated by a positive correlation of BHP abundances with Corg and δ15N.

scholarly journals Seasonal dynamics of methane in the water column of two subtropical lakes differing in trophic status

2009 ◽  
Vol 69 (2) ◽  
pp. 281-287 ◽  
Author(s):  
CC. Marinho ◽  
C. Palma Silva ◽  
EF. Albertoni ◽  
CR. Trindade ◽  
FA. Esteves
Keyword(s):  
Water Column ◽  
Methane Concentration ◽  
Trophic Status ◽  
Rio Grande ◽  
Aquatic Systems ◽  
Subtropical Lakes ◽  
Production And Consumption ◽  
Higher Temperature ◽  
Methane Concentrations ◽  
Methane Dynamics

Alterations in methane concentration in the water column of aquatic systems is closely linked to the processes of production and consumption of this gas, i.e., methanogenesis and methanotrophy respectively. The aim of this research is to evaluate methane dynamics through diurnal variation in the concentration of this gas in the water column of two lakes differing in trophic status at the campus of Fundação Universidade do Rio Grande (FURG). In two sampling periods (November 2001 and July 2002) methane concentrations in the water column were significantly higher (3.66 and 0.41 μmoles.L-1, respectively) at Lago dos Biguás, with mesoeutrophic features when related to Lago Polegar (1.43 and 0.19 μmoles.L-1, respectively) which has oligotrophic features. The higher methane concentrations were detected in November 2001 when higher temperature was also detected. The results highlighted the importance of trophic status as well as seasonality for the methane dynamics in these ecosystems.

scholarly journals Near-Bottom Hypoxia Impacts Dynamics of Bacterioplankton Assemblage throughout Water Column of the Gulf of Finland (Baltic Sea)

PLoS ONE ◽  
2016 ◽  
Vol 11 (5) ◽  
pp. e0156147 ◽  
Author(s):  
Peeter Laas ◽  
Elina Šatova ◽  
Inga Lips ◽  
Urmas Lips ◽  
Jaak Simm ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
Gulf Of Finland ◽  
Bottom Hypoxia ◽  
The Gulf Of Finland

scholarly journals Genomic Variations Underlying Speciation and Niche Specialization of Shewanella baltica

mSystems ◽  
2019 ◽  
Vol 4 (5) ◽  
Author(s):  
Jie Deng ◽  
Jennifer M. Auchtung ◽  
Konstantinos T. Konstantinidis ◽  
Ingrid Brettar ◽  
Manfred G. Höfle ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
Transition Zone ◽  
Anaerobic Respiration ◽  
Electron Acceptors ◽  
Gene Content ◽  
Content Type ◽  
Genomic Variations ◽  
Niche Specialization ◽  
Shewanella Baltica

ABSTRACT Shewanella baltica was the dominant culturable nitrate-reducing bacterium in the eutrophic and strongly stratified Baltic Sea in the 1980s, where it primarily inhabited the oxic-anoxic transition zone. The genomic structures of 46 of these isolates were investigated through comparative genomic hybridization (CGH), which revealed a gradient of genomic similarity, ranging from 65% to as high as 99%. The core genome of the S. baltica species was enriched in anaerobic respiration-associated genes. Auxiliary genes, most of which locate within a few genomic islands (GIs), were nonuniformly distributed among the isolates. Specifically, hypothetical and mobile genetic element (MGE)-associated genes dominated intraclade gene content differences, whereas gain/loss of functional genes drove gene content differences among less related strains. Among the major S. baltica clades, gene signatures related to specific redox-driven and spatial niches within the water column were identified. For instance, genes involved in anaerobic respiration of sulfur compounds may provide key adaptive advantages for clade A strains in anoxic waters where sulfur-containing electron acceptors are present. Genes involved in cell motility, in particular, a secondary flagellar biosynthesis system, may be associated with the free-living lifestyle by clade E strains. Collectively, this study revealed characteristics of genome variations present in the water column and active speciation of S. baltica strains, driven by niche partitioning and horizontal gene transfer (HGT). IMPORTANCE Speciation in nature is a fundamental process driving the formation of the vast microbial diversity on Earth. In the central Baltic Sea, the long-term stratification of water led to formation of a large-scale vertical redoxcline that provided a gradient of environmental niches with respect to the availability of electron acceptors and donors. The region was home to Shewanella baltica populations, which composed the dominant culturable nitrate-reducing bacteria, particularly in the oxic-anoxic transition zone. Using the collection of S. baltica isolates as a model system, genomic variations showed contrasting gene-sharing patterns within versus among S. baltica clades and revealed genomic signatures of S. baltica clades related to redox niche specialization as well as particle association. This study provides important insights into genomic mechanisms underlying bacterial speciation within this unique natural redoxcline.

scholarly journals Hypoxia and nitrogen processing in the Baltic Sea water column

2012 ◽  
Vol 57 (1) ◽  
pp. 325-337 ◽  
Author(s):  
Susanna Hietanen ◽  
Helena Jäntti ◽  
Christo Buizert ◽  
Klaus Jürgens ◽  
Matthias Labrenz ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Water Column ◽  
Sea Water ◽  
The Baltic Sea ◽  
The Baltic
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