Major substrates for microbial sulfate reduction in the sediments of Ise Bay, Japan |
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Authors: | Manabu Fukui Jungin Suh Yoshitaka Yonezawa Yoshikuni Urushigawa |
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Institution: | (1) National Institute for Resources and Environment, AIST, MITI, Onogawa 16-3, 305 Tsukuba, Ibaraki, Japan;(2) Department of Urban Engineering, Yeungnam University, 214-1, Dae-Dong, Kyongsan-Si, 712-749 Kyongbuk, Korea |
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Abstract: | To clarify the anaerobic microbial interactions in the process of carbon mineralization in marine eutrophic environments,
the microbial sulfate reduction and methane production rates were examined in coastal marine sediments of Ise Bay, Japan,
in autumn 1990. Sulfate reduction rates (51–210 nmol ml−1 day−1 at 24°C) were much higher than the methane production ones (<1.78 nmol ml−1 day−1) in the surface sediments (top 2 cm) at the six stations surveyed (water depth: 10.7–23.3 m). Substrates for sulfate-reducing
bacteria (SRB) were estimated after the addition of a specific inhibitor for SRB (20 mmol l−1 molybdate) into the sediment slurry, from the substrate accumulation rates. In the presence of the inhibitor, sulfate reduction
was completely stopped and volatile fatty acids (mainly acetate) were accumulated, although hydrogen was not. Methane production
occurred markedly accompanied by consumption of the accumulated acetate from the third day after the addition of molybdate.
The maximum rate of methane production was 1.2–1.9 μmol ml−1 day−1, which was similar to those in highly polluted freshwater sediments such as the Tama River, Tokyo, Japan. These results show
that acetate is a common major substrate for sulfate reduction and methane production, and SRB competitively inhibit potential
acetoclastic methanogenesis in coastal sediments. Methanogens may potentially inhabit the sediments at low levels of population
density and activity. |
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Keywords: | acetate methane production sediment specific inhibitor sulfate reduction |
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