Sulfate Reduction and Methanogenesis in Sediments of Mtoni Mangrove Forest, Tanzania

Lyimo, Thomas J.; Pol, Arjan; Camp, Huub J. M. Op den

doi:10.1639/0044-7447(2002)031[0614:sramis]2.0.co;2

Cited by 28 publications

(50 citation statements)

References 26 publications

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“…are limited by sulfate availability (18,19). This hypothesis is strongly supported by the observation that, for a field survey across North America and Europe, the rate of sulfate reduction in peatland soils increases with increasing sulfate deposition up to a rate of 15-20 kg SO 4 2Ϫ -S ha Ϫ1 ⅐yr Ϫ1 (26).…”

mentioning

confidence: 83%

“…In wetlands, however, the balance between sulfate reduction and methanogenesis is affected by factors such as the temperature [warmer temperatures favor methanogenesis (15)], the rate of SO 4 2Ϫ and acetate supply [lower concentrations of sulfate or higher concentrations of acetate reduce the intensity of competition (13)], and the availability of noncompetitive substrates [some low molecular weight hydrocarbons may be preferentially used over acetate by SRB (16,17) and some substrates such as methanol, methanethiol, and dimethyl sulfide may be used by MA but are poorly used by SRB (18,19)]. As a consequence, sulfate reduction in wetlands partially, rather than completely, inhibits methane production (19). Stimulation of sulfate reduction has been exploited as a mechanism to reduce GHG emissions from rice paddies; in field trials, CH 4 emissions have been reduced by as much as 72% with doses of gypsum (CaSO 4 ) ranging from several hundred to thousands of kilograms of SO 4 2Ϫ per hectare (ha) (20,21).…”

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confidence: 99%

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Sulfur pollution suppression of the wetland methane source in the 20th and 21st centuries

Gauci

Matthews

Dise

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

146

119

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Natural wetlands form the largest source of methane (CH4) to the atmosphere. Emission of this powerful greenhouse gas from wetlands is known to depend on climate, with increasing temperature and rainfall both expected to increase methane emissions. This study, combining our field and controlled environment manipulation studies in Europe and North America, reveals an additional control: an emergent pattern of increasing suppression of methane (CH 4) A tmospheric methane (CH 4 ) is a powerful greenhouse gas (GHG) that is responsible for an estimated 22% of the present anthropogenically enhanced greenhouse effect (1). Natural (nonrice agriculture) wetlands are the world's largest single CH 4 source and are estimated to currently contribute between 110 and 260 Tg (Tg ϭ 10 12 g) to the global methane budget (2), of which one-third is derived from temperate and boreal northern wetlands (3). CH 4 emissions from wetlands are climatesensitive, responding positively to increases in temperature and rainfall as microbial activity and anaerobic conditions increase and negatively to cool temperatures and drought (4, 5). Like many other ecosystems, wetlands are also subject to the effects of aerial pollution and increasing CO 2 levels. The stimulatory effects of increased atmospheric CO 2 concentrations on CH 4 emission (by enhancement of net primary productivity) is well reported (6-8), although a similar stimulatory effect of nitrogen pollution on wetland CH 4 emission has not always been identified (8-10) because of differing effects nitrogen has on the ecosystem, e.g., plant species composition is an important factor in determining the effect of experimental N additions on CH 4 fluxes (10).CH 4 is produced by two different groups of methanogenic archaea (MA); one group obtains energy by the fermentation of simple organic compounds, such as acetate to CO 2 and CH 4 , and the other obtains energy by oxidizing molecular hydrogen to H 2 O by using CO 2 , which is reduced to CH 4 . Acetate-fermenting MA tend to dominate in more nutrient-rich peatlands and in summer, when the supply of labile organic carbon is relatively high. However, it has been recently demonstrated that climate, depth of the acrotelm, and acetate concentrations add a fair degree of plasticity over controls on acetate-fermenting MA (11). Both groups of microorganisms are strictly anaerobic, and both are suppressed by another group of anaerobic microorganisms, sulfate-reducing bacteria (SRB) (12).SRB have a higher affinity for both hydrogen and acetate than MA, which, under ideal conditions, enables them to maintain the pool of these substrates at concentrations too low for MA to use (13,14). In wetlands, however, the balance between sulfate reduction and methanogenesis is affected by factors such as the temperature [warmer temperatures favor methanogenesis (15)], the rate of SO 4 2Ϫ and acetate supply [lower concentrations of sulfate or higher concentrations of acetate reduce the intensity of competition (13)], and the availability of noncompetitive substra...

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mentioning

confidence: 83%

mentioning

confidence: 99%

Sulfur pollution suppression of the wetland methane source in the 20th and 21st centuries

Gauci

Matthews

Dise

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

146

119

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“…Zinder and Brock (1978d) were the first to report the anaerobic conversion of DMS and MeSH to C0 2 and CH 4 in freshwater lake sediments and sewage sludge. Since then, this process has been reported to occur in many anoxic environments including salt marsh and mangrove sediments, hypersaline lakes, and a variety of freshwater sediments (Jonkers et al, 2000;Kiene, 1988;Kiene et al, 1986;Lomans et al, 1999aLomans et al, , 2001bLyimo et al, 2000Lyimo et al, , 2002. Degradation of DMS and MeSH in anaerobic environments is catalyzed primarily by methanogenic, SO|~-reducing, NO^-reducing, and phototrophic bacteria (Kiene, 1988(Kiene, , 1991aKiene et al, 1986;Liu et al, 1990;Lomans et al, 2002b;Lyimo et al, 2000;Oremland et al, 1989;Tanimoto and Bak, 1994;Visscher et al, 1995;Zeyer et al, 1987).…”

Section: Methylsulfidesmentioning

confidence: 99%

Anaerobic Metabolism: Linkages to Trace Gases and Aerobic Processes

Megonigal¹,

Hines²,

Visscher³

2014

Treatise on Geochemistry

128

164

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“…Methanogenesis and sulfate reduction are important processes responsible for the terminal electron removal during decomposition of organic matter in anaerobic environments. A novel obligately methylotrophic methanogenic bacteria, Methanosarcina semesiae MD1 (T), has been isolated from Tanzania's mangrove sediments and identified by analyzing the 16S region of the rRNA; and sediments' organic matter contents, bacterial numbers, methane emission, sulphide concentration and redox potential profiles have been studied (Lyimo et al, 2000(Lyimo et al, , 2002a(Lyimo et al, , 2002b. The sediments are characterized as having high organic matter content and bacterial numbers.…”

Section: Nitrogen Fixation Sulphur Reduction and Methanogenesis In Mmentioning

confidence: 99%

Trends in industrial and environmental biotechnology research in Tanzania

Mtui¹

2007

Afr. J. Biotechnol.

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This paper reviews the trends in industrial and environmental biotechnology research in Tanzania for the past 20 years. Researches on production of bio-energy, enzymes and organic acids are reviewed. Furthermore, researches related to wastewater treatment systems including water stabilization ponds and constructed wetlands are covered. Brief highlights are made on researches related to bioprospecting and molecular biology techniques used in identification of organisms. In critically reviewing the research done so far, an attempt is made to pinpoint significant research gaps in areas such as single cell protein, biomining, biocomposting and bioengineering. This paper, therefore, provides an overview of the renewable raw materials available in the developing countries and outlines the researches that have been done to convert them to bio-products, while reducing bio-wastes. The identified gaps will serve as guidance to scientists who are interested in doing research in untapped areas of biotechnology.

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Sulfate Reduction and Methanogenesis in Sediments of Mtoni Mangrove Forest, Tanzania

Cited by 28 publications

References 26 publications

Sulfur pollution suppression of the wetland methane source in the 20th and 21st centuries

Sulfur pollution suppression of the wetland methane source in the 20th and 21st centuries

Anaerobic Metabolism: Linkages to Trace Gases and Aerobic Processes

Trends in industrial and environmental biotechnology research in Tanzania

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