Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers

Grossman, Ethan L.; Coffman, Bryan Keith; Fritz, Steven J.; Wada, Hideki

doi:10.1130/0091-7613(1989)017<0495:bpomai>2.3.co;2

Cited by 90 publications

(50 citation statements)

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“…Groundwater methanotrophic bacteria have extremely light &"C, ranging between -55 to -90% when oxidizing biogenic methane (Grossman & Coffman 1989), while sulfide-oxidizing bacteria from a nearby sinkhole, Cenote Angelita, had a 613C of -34.3%,,. Assimilation of these I3C-depleted stable carbon isotope sources could help explain the fauna1 isotope ratios.…”

Section: Discussion Nitrification and Carbon Cycling In Anchialine Cavesmentioning

confidence: 99%

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

Jw¹,

Iliffe²,

La³

1997

Mar. Ecol. Prog. Ser.

112

116

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ABSTRACT. Stable carbon and nltrogen isotope data, complen~ented wlth other geochemical parameters, were used to Identify the sources of organic mattrr that support the food web of an anchialine cave ecosystem In the northeastern Yucatan Peninsula, Mexlco. A n c h~a l~n e caves, coinmon along tropical kal-st~c and volcan~c coastlines, are completely or partially Inundated by highly stratified layers of fresh and marine waters. Stable isotope data from the cave fauna, the particulate organlc matter (POM) from the cenote pool and from the cave, the forest soil and the cave sedlmcnts ~ndicated that at least 3 soul-ces of nutritive organics could support the anchialine food web. Thcsr sources were. (1) soil from the overlying forest; (2) freshwater algae from adjoining open water pools; and (3) chernoautotrophic nitrifying bactei-la living in the cave. Production of nitrate a n d a tlccrcasc in O2 along the halocline provided geochemlcal evidence of nitrification. Stable nitrogen isotope datd defined 2 to 2.5 trophic levels In the food web. Furthermore, it was found that troglobitic (cave-limited) species res~ding In the water column a r e cilpable of preferentially feeding on specific organic reservoirs. This study presents the first extensive description of the ecological and biogeochemical relationships of the anchialine cave ecosystem.

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Section: Discussion Nitrification and Carbon Cycling In Anchialine Cavesmentioning

confidence: 99%

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

Jw¹,

Iliffe²,

La³

1997

Mar. Ecol. Prog. Ser.

112

116

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“…The occurrence of isotope fractionation was successfully used to demonstrate denitrification (8,9) and sulfate reduction (10,11) in aquifers. In addition, stable carbon isotopes have proved to be a useful tool to distinguish between different sources of DIC in uncontaminated (12) and contaminated aquifers (13)(14)(15)(16). However, little is known yet about the influence of microbial degradation on isotope ratios in individual organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

Monitoring Microbial Dechlorination of Tetrachloroethene (PCE) in Groundwater Using Compound-Specific Stable Carbon Isotope Ratios: Microcosm and Field Studies

Hunkeler

Aravena

Butler

1999

Environ. Sci. Technol.

299

313

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The determination of compound-specific stable isotope ratios is a promising new tool to assess biodegradation of organic compounds in groundwater. In this study, the occurrence of carbon isotope fractionation during dechlorination of tetrachloroethene (PCE) to ethene was evaluated in a PCE-contaminated aquifer and in a microcosm that was based on aquifer material from the site. In the microcosm, all dechlorination steps were accompanied by carbon isotope fractionation. The largest fractionation occurred during dechlorination of cis-1,2-dichloroethene (cDCE) and vinyl chloride (VC), resulting in a large enrichment of 13 C in the remaining cDCE and VC. Stable carbon isotope ratios (δ 13 C) of cDCE and VC increased from -25.7 to -1.5‰ and -37.0 to -2.5‰, respectively. The δ 13 C of ethene was initially -60.2‰ and approached the δ 13 C of the added PCE (-27.3‰) as dechlorination came to completion. A similar carbon isotope pattern was observed for PCE dechlorination at the field site. Strong enrichment of 13 C in cDCE and VC during microbial dechlorination may serve as a powerful tool to monitor the last two dechlorination steps, which frequently determine the rate of complete dechlorination of chlorinated ethenes at field sites undergoing intrinsic bioremediation.

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“…Microbial production of la lved inor anic materials (Barker & Fritz 1981, Grossman et al 1989) and the C content of disso g carbon (DIC) (Barker, Fritz & Brown 1979) and thus, modify the "C age of the water. The effects on carbonate chemistry from redox processes make it very difficult to apply most la age correction models, especially fixed-model interpretations.…”

Section: Introductionmentioning

confidence: 99%

¹⁴C Dating of Groundwater Containing Microbial CH₄

1992

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Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers

Cited by 90 publications

References 0 publications

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

Monitoring Microbial Dechlorination of Tetrachloroethene (PCE) in Groundwater Using Compound-Specific Stable Carbon Isotope Ratios: Microcosm and Field Studies

¹⁴C Dating of Groundwater Containing Microbial CH₄

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Bacterial production of methane and its influence on ground-water chemistry in east-central Texas aquifers

Cited by 90 publications

References 0 publications

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

A stable isotope study of organic cycling and the ecology of an anchialine cave ecosystem

Monitoring Microbial Dechlorination of Tetrachloroethene (PCE) in Groundwater Using Compound-Specific Stable Carbon Isotope Ratios: Microcosm and Field Studies

14C Dating of Groundwater Containing Microbial CH4

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¹⁴C Dating of Groundwater Containing Microbial CH₄