Comparison of microbial dynamics in marine and freshwater sediments: Contrasts in anaerobic carbon catabolism

Capone, Douglas G.; KIENE, RONALD P.

doi:10.4319/lo.1988.33.4_part_2.0725

Cited by 386 publications

(329 citation statements)

References 45 publications

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“…Sulfide oxidation -As noted earlier, the sulfur cycle always dominates the pathways of anaerobic decomposition when sulfate is abundant (see Capone and Kiene 1988). Consequently, the oxidation of sulfides and other reduced products of the sulfur cycle is much more important than methane oxidation in marine systems.…”

Section: Deep-sea Conditionsmentioning

confidence: 90%

“…Capone and Kiene 1988;Jorgensen 1983;Fenchel and Blackburn 1979). Briefly, organic matter is fermented by one group of microbes, and then another group uses the fermentation products of hydrogen, fatty acids, and acetate either in sulfate reduction or in methanogenesis.…”

Section: Deep-sea Conditionsmentioning

confidence: 99%

“…An added complication is that anaerobic methane oxidation also occurs (Alperin and Reeburgh 1985). The whole topic is ex-plored in detail elsewhere in this volume (Capone and Kiene 1988).…”

Section: Deep-sea Conditionsmentioning

confidence: 99%

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A comparison of the ecology of planktonic bacteria in fresh and salt water

Hobbie

1988

Limnology & Oceanography

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The planktonic bacteria inhabiting fresh and salt waters are not physiologically identical; most marine bacteria, for example, require sodium and some marine forms can thrive at 1,000 atm of pressure in the deep sea. Despite this difference, the conclusion of this review is that the ecology of planktonic bacteria is virtually identical in fresh and salt waters.The differences are small and mostly a matter of relative proportion of various processes. That is, similar bacterial processes occur in fresh and salt waters but in each environment, one process may be more important than another. For example, bacteria in freshwaters are exposed to high amounts of refractory dissolved organic carbon from soil and stream runoff, while many marine bacteria are exposed to relatively more of the labile organic matter from decaying algae. Also, under anaerobic conditions the sulfur cycle will be dominant in the sea while the carbon-methane cycle will be more important in freshwaters. In spite of the presence of relatively high amounts of methane in the sea, there is thus far little evidence that ,a significant amount of methane is being oxidized.Not enough is yet known to determine if there are dilfcrences in the grazing of bacteria in the two systems. Small, flagellated protozoans are very important grazers in freshwater and marine systems but there is some evidence from salt waters that ciliates are also important grazers. Marine ecosystems also contain large animals that can filter out bacteria. Sponges are the dominant suspension feeders on coral reefs, mussels and oysters are dominant in estuarine and marsh systems, and a large appendicularian may filter significant amounts of bacteria through a mucous net. Ecological understanding of the aquatic bacteria has advanced rapidly in the past two decades. One reason is the basic similarity between microbial ecology in fresh and salt waters and the consequent interchangeability of techniques.

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Section: Deep-sea Conditionsmentioning

confidence: 90%

Section: Deep-sea Conditionsmentioning

confidence: 99%

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A comparison of the ecology of planktonic bacteria in fresh and salt water

Hobbie

1988

Limnology & Oceanography

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“…Chemical profiles in pore water of organic-rich sediments indicate that various microbes use a series of electron acceptors during the remineralization of organic matter in the order of decreasing chemical potential, and methanogenesis accounts for the last stage of the microbial respiration. In stratified lakes developing an anoxic hypolimnion, methanogenesis and sulfate reduction are key terminal processes in anaerobic carbon remineralization (Capone and Kiene 1988). One of the factors controlling the end products of microbial decomposition is the competition between methanogenic microorganisms and sulfate-reducing bacteria (SRB) for common substrates such as hydrogen and acetate.…”

mentioning

confidence: 99%

Quantifying rates of methanogenesis and methanotrophy in Lake Kinneret sediments (Israel) using pore‐water profiles

Adler

Eckert

Sivan

2011

Limnology & Oceanography

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Full seasonal sets of chemical and isotope profiles from the pore water of Lake Kinneret (Sea of Galilee, Israel) were produced to study methanogenesis and methanotrophy processes and the couplings between methane (CH 4 ), sulfur, and iron. Sulfate is depleted within the upper 10 cm of the sediment mainly by traditional bacterial sulfate reduction by organic matter. Maximum sulfate reduction rates calculated from sulfate concentration profiles are found at the water-sediment interface (0-1 cm 2 1.4 3 10 212 6 0.2 3 10 212 mol cm 23 s 21 ). CH 4 concentrations and modeling of dissolved inorganic carbon (DIC) and its stable carbon isotope (d 13 C DIC ) suggest that maximum methanogenesis rates of 2.5 3 10 213 6 1.5 3 10 213 mol cm 23 s 21 occur at 5-12-cm depth in the sediments, and that it ends at 20 cm. Of the produced CH 4 , 50-75% is converted to gas bubbles of CH 4 before it reaches the bottom water. Model results suggest the occurrence of anaerobic oxidation of CH 4 (AOM) in the deep sediments of the lake below the zone of methanogenesis.

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“…Concomitantly, sea level rise will also influence the supply of specific TEAs, such as SO 4 2À , with uncertain effects on mineralization. It is already well established that the availability of TEAs affects the last (terminal) step of anaerobic decomposition (Capone and Kiene, 1988;Reddy and D'Angelo, 1994;D'Angelo and Reddy, 1999;Megonigal et al, 2004) by acting through interspecific competition for electron donors (acetate and H 2 ). Indeed, previous work has demonstrated that sea level rise can lead to a shift of electron flow from methanogens to the competitively superior sulfate reducers (Neubauer et al, 2005;Weston et al, 2006).…”

Section: Introductionmentioning

confidence: 99%