scholarly journals Exchange catalysis during anaerobic methanotrophy revealed by 12CH2D2 & 13CH3D in methane

2018 ◽  
Author(s):  
Jeanine L. Ash ◽  
Matthias Egger ◽  
Tina Treude ◽  
Issaku Kohl ◽  
Barry Cragg ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Anaerobic Oxidation Of Methane ◽  
The Baltic Sea ◽  
Methane Cycle ◽  
Isotopic Equilibrium ◽  
Sediment Samples ◽  
Oxidation Of Methane ◽  
Crucial Component ◽  
The Baltic ◽  
Methyl Coenzyme M Reductase

The anaerobic oxidation of methane (AOM) is a crucial component of the methane cycle, but its enzymatic versatility under environmental conditions remains poorly understood. We use sediment samples collected during IODP Expedition 347 to the Baltic Sea to show that relative abundances of 12CH2D2 and 13CH3D molecules in methane gas trace the reversibility of methyl-coenzyme M reductase during AOM by driving methane towards internal, thermodynamic isotopic equilibrium. These data suggest that 12CH2D2 and 13CH3D together can identify the influence of methanotrophy in environments where conventional bulk isotope ratios are ambiguous, and these findings may lead to new insights regarding the global significance of enzymatic back-flux in the methane cycle.

scholarly journals A three-dimensional view on biodiversity changes: spatial, temporal, and functional perspectives on fish communities in the Baltic Sea

2018 ◽  
Vol 75 (7) ◽  
pp. 2463-2475 ◽  
Author(s):  
Romain Frelat ◽  
Alessandro Orio ◽  
Michele Casini ◽  
Andreas Lehmann ◽  
Bastien Mérigot ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
Environmental Changes ◽  
Temporal Dynamics ◽  
Marine Ecosystem ◽  
Fish Communities ◽  
The Baltic Sea ◽  
Functional Richness ◽  
Holistic Understanding ◽  
The Baltic

Abstract Fisheries and marine ecosystem-based management requires a holistic understanding of the dynamics of fish communities and their responses to changes in environmental conditions. Environmental conditions can simultaneously shape the spatial distribution and the temporal dynamics of a population, which together can trigger changes in the functional structure of communities. Here, we developed a comprehensive framework based on complementary multivariate statistical methodologies to simultaneously investigate the effects of environmental conditions on the spatial, temporal and functional dynamics of species assemblages. The framework is tested using survey data collected during more than 4000 fisheries hauls over the Baltic Sea between 2001 and 2016. The approach revealed the Baltic fish community to be structured into three sub-assemblages along a strong and temporally stable salinity gradient decreasing from West to the East. Additionally, we highlight a mismatch between species and functional richness associated with a lower functional redundancy in the Baltic Proper compared with other sub-areas, suggesting an ecosystem more susceptible to external pressures. Based on a large dataset of community data analysed in an innovative and comprehensive way, we could disentangle the effects of environmental changes on the structure of biotic communities—key information for the management and conservation of ecosystems.

scholarly journals Local Environmental Conditions Shape Generalist But Not Specialist Components of Microbial Metacommunities in the Baltic Sea

2016 ◽  
Vol 07 ◽  
Author(s):  
Markus V. Lindh ◽  
Johanna Sjöstedt ◽  
Michele Casini ◽  
Agneta Andersson ◽  
Catherine Legrand ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Distribution, abundance and environmental conditions of the clonal aquatic fern Salvinia natans (L.) All. in the Vistula delta (Baltic Sea Region)

2012 ◽  
Vol 28 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Agnieszka Gałka ◽  
Józef Szmeja
Keyword(s):  
Baltic Sea ◽  
Environmental Conditions ◽  
Vistula Lagoon ◽  
Alkaline Ph ◽  
The Baltic Sea ◽  
Aquatic Fern ◽  
Baltic Sea Region ◽  
Salvinia Natans ◽  
The Baltic ◽  
Vistula Delta

Abstract We examined the distribution, resources and environmental conditions of the clonal aquatic fern Salvinia natans (L.) All., expansive in the Vistula delta (N Poland). Before 2006, there were 7 stands of this species, while in the years 2006-2010 their number increased to 21. The most abundant populations were found in the rivers: Tuga (133.0±37.6 indiv./0.1 m2), Fiszewka( 79.3±6.0), Szkarpawa (74.7±5.0), Struga Orłowska (61.0±2.0), Nogat (52.3±2.5), Elbląg (40.3±31.8), Wiślano-Zalewowy Canal (61.3±3.2) and in the SW part of Lake Druzno (72.3±2.5). S. natans did not colonise the weakly saline Vistula Lagoon and Elbląg Bay, which belong to the Baltic Sea. The plant under study occurred in shallow (2.2±1.5 m), narrow (17.9±13.6 m), slow-flowing (0.11±0.12 m s-1) and fertile (4.7±4.2 mg TN dm-3, 0.7±0.4 mg TP dm-3) watercourses. The water in them had neutral or alkaline pH (7.2-9.2) and was weakly saline (53.8±21.3 mg Cl dm-3). A dense mat of S. natans significantly affected the environmental conditions in the watercourses: water oxygenation, PAR intensity and concentration of biogenic substances, especially phosphorus, decreased.

scholarly journals Methane distribution in Holocene marine sediments in the Bornholm Basin, southern Scandinavia

1969 ◽  
Vol 26 ◽  
pp. 21-24 ◽  
Author(s):  
Jørn Bo Jensen ◽  
Rudolf Endler
Keyword(s):  
Baltic Sea ◽  
Marine Sediments ◽  
Sustainable Use ◽  
Late Glacial ◽  
Scientific Basis ◽  
Geological Mapping ◽  
The Baltic Sea ◽  
Methane Cycle ◽  
The North ◽  
The Baltic

The Baltic Sea is an ideal natural laboratory to study the methane cycle in the framework of diagenetic processes. In this paper we present preliminary geological mapping results from project Baltic Gas, a research project with the overall aim to contribute to the development of a scientific basis for long term sustainable use and protection of the Baltic Sea ecosystem. The Baltic Sea is a marginal sea with a strong permanent haline stratification, which leads to oxygen-poor bottom waters, and which is sometimes interrupted by oxygen- rich saltwater flowing in from the North Sea. The history of the Baltic Sea has resulted in deposition of organic-rich Holocene marine sediments that overlie glacial, late-glacial and early Holocene organic-poor sediments.

Morpholithodynamic conditions of the tip of the Hel Peninsula, the Baltic Sea

2015 ◽  
Vol 44 (2) ◽  
Author(s):  
Maria Rucińska-Zjadacz ◽  
Stanisław Rudowski
Keyword(s):  
Deep Water ◽  
General Nature ◽  
Base Line ◽  
The Baltic Sea ◽  
Sediment Samples ◽  
The Baltic ◽  
Line Positions ◽  
Water Depths ◽  
Beach Profiling

AbstractThe Hel Peninsula is a 35 km long spit that extends into water depths of almost 60 m. Unlike most sandy barriers, the distal end of the Hel Peninsula is prograding into the deep water. This affects unique conditions for the evolution of this section of the Peninsula. The aim of this study is to determine the morpholithodynamic changes on the tip of the Hel Peninsula. Shore studies were performed in 2006-2008 and 2012. Measurements included: beach profiling, determination of shoreline and dune base line positions, and collection of sediment samples. The different nature of the eastern, central and western part of the Hel tip is evident. The eastern part is accumulative, the central part is variable with the general nature of strong and differently directed redeposition and accumulative periods, while the western part is highly erosive.

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