Abstract
The microbial transformation of [N-methyl-(sup14)C]aldicarb, a carbamate pesticide, occurred in aquifer, lake, and salt marsh sediments. Microbial degradation of aldicarb took place within 21 days in aquifer sediments from sites previously exposed to aldicarb (Jamesport, Long Island, N.Y.) but did not occur in sediments which were not previously exposed (Connetquot State Park, Long Island, N.Y.). At the Jamesport sites, higher aldicarb transformation rates occurred in deep, anoxic sediments than in shallow, oxic sediments. There was a significant negative relationship (P < 0.05) between transformation rates and ambient dissolved O(inf2) levels. Aldicarb hydrolysis rates in Jamesport sediments were 10- to 1,000-fold lower than rates previously reported for soils. In addition, aldicarb degradation rates were not significantly correlated with measurements of bacterial activity and density previously determined in the same sediments. Substantially higher aldicarb degradation rates were found in anoxic lake and salt marsh than in aquifer sediments. Furthermore, we investigated the anaerobic microbial processes involved in aldicarb transformation by adding organic substrates (acetate, glucose), an alternative electron acceptor (nitrate), and microbial inhibitors (molybdate, 2-bromoethanesulfonic acid) to anoxic aquifer, lake, and salt marsh sediments. The results suggest that a methanogenic consortium was important in aldicarb transformation or in the use of aldicarb-derived products such as methylamine. In addition, microbial aldicarb transformation proceeded via different pathways under oxic and anoxic conditions. In the presence of O(inf2), aldicarb transformation was mainly via an oxidation pathway, while in the absence of O(inf2), degradation took place through a hydrolytic pathway (including the formation of methylamine precursors). Under anoxic conditions, therefore, aldicarb can be transformed by microbial consortia to yield products which can be of direct benefit to natural populations of methanogens present in sediments.
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- Aelion C. M., Bradley P. M. Aerobic biodegradation potential of subsurface microorganisms from a jet fuel-contaminated aquifer. Appl Environ Microbiol. 1991 Jan;57(1):57–63. doi: 10.1128/aem.57.1.57-63.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Chapalamadugu S., Chaudhry G. R. Hydrolysis of carbaryl by a Pseudomonas sp. and construction of a microbial consortium that completely metabolizes carbaryl. Appl Environ Microbiol. 1991 Mar;57(3):744–750. doi: 10.1128/aem.57.3.744-750.1991. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Genthner B. R., Price W. A., Pritchard P. H. Anaerobic Degradation of Chloroaromatic Compounds in Aquatic Sediments under a Variety of Enrichment Conditions. Appl Environ Microbiol. 1989 Jun;55(6):1466–1471. doi: 10.1128/aem.55.6.1466-1471.1989. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gibson S. A., Suflita J. M. Anaerobic biodegradation of 2,4,5-trichlorophenoxyacetic Acid in samples from a methanogenic aquifer: stimulation by short-chain organic acids and alcohols. Appl Environ Microbiol. 1990 Jun;56(6):1825–1832. doi: 10.1128/aem.56.6.1825-1832.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Jones R. L., Marquardt T. E. Monitoring of aldicarb residues in Long Island, New York potable wells. Arch Environ Contam Toxicol. 1987 Nov;16(6):643–647. doi: 10.1007/BF01055414. [DOI] [PubMed] [Google Scholar]
- Kiene R. P., Capone D. G. Stimulation of methanogenesis by aldicarb and several other N-methyl carbamate pesticides. Appl Environ Microbiol. 1986 Jun;51(6):1247–1251. doi: 10.1128/aem.51.6.1247-1251.1986. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lovley D. R., Klug M. J. Sulfate reducers can outcompete methanogens at freshwater sulfate concentrations. Appl Environ Microbiol. 1983 Jan;45(1):187–192. doi: 10.1128/aem.45.1.187-192.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Miles C. J., Delfino J. J. Determination of aldicarb and its derivatives in groundwater by high-performance liquid chromatography with UV detection. J Chromatogr. 1984 Sep 7;299(1):275–280. doi: 10.1016/s0021-9673(01)97841-0. [DOI] [PubMed] [Google Scholar]
- Moye H. A., Miles C. J. Aldicarb contamination of groundwater. Rev Environ Contam Toxicol. 1988;105:99–146. doi: 10.1007/978-1-4612-3876-8_3. [DOI] [PubMed] [Google Scholar]
- Swindoll C. M., Aelion C. M., Pfaender F. K. Influence of inorganic and organic nutrients on aerobic biodegradation and on the adaptation response of subsurface microbial communities. Appl Environ Microbiol. 1988 Jan;54(1):212–217. doi: 10.1128/aem.54.1.212-217.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Winfrey M. R., Ward D. M. Substrates for sulfate reduction and methane production in intertidal sediments. Appl Environ Microbiol. 1983 Jan;45(1):193–199. doi: 10.1128/aem.45.1.193-199.1983. [DOI] [PMC free article] [PubMed] [Google Scholar]