Changes in the limnological features of a meromictic Lake Suigetsu during the years, 1926–1967

Matsuyama, Michiro

doi:10.1007/bf02109088

Cited by 35 publications

(25 citation statements)

References 7 publications

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“…Lake Suigetsu is a meromictic lake in Fukui Prefecture, Japan, characterized by a permanent oxycline at a depth between 3 and 8 m separating the aerobic freshwater epilimnion from the anaerobic, saline, sulfi dogenic hypolimnion (Kondo et al 2000;Matsuyama 1973; Matsuyama and Saijo 1971;Takahashi and Ichimura 1968). Seawater from the Japan Sea penetrates Lake Suigetsu through Lakes Hiruga and Kugushi adjacent to Lake Suigetsu only at high tides during the autumn and winter.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the diversity of sulfate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake

Kondo

Butani

2007

Limnology

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Comparison of the diversity of sulfate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake Abstract The diversity and abundance of sulfate-reducing bacteria (SRB) were investigated in Lake Suigetsu, a meromictic lake in Japan characterized by a permanent oxycline at a depth between 3 and 8 m separating the aerobic freshwater epilimnion from the anaerobic, saline, sulfi dogenic hypolimnion. A quantitative competitive PCR targeting the gene coding for a portion of the α-subunit of dissimilatory sulfi te reductase (dsrA) was used to assess the distribution of the SRB in the stratifi ed water column and the surface sediments. The diversity of the SRB communities was assessed using a sequence analysis of the differing dsrA isomers. The dsrA gene copy numbers of SRB in the hypolimnic waters were from 9.6 × 10 3 to 7.5 × 10 5 copies ml −1 , whereas higher dsrA copy numbers of SRB were observed in surface sediments, ranging from 1.8-8.1 × 10 7 copies ml −1 as estimated by competitive PCR. Phylogenetic analysis of the dsrA sequences retrieved from the surface sediments shows most belong to a deeply branching lineage of diverse dsrA sequences not related to any cultured SRB group. In contrast, dsrA sequences found in the oxycline waters were related to sequences of members of the genera Desulfonema, Desulfosarcina, and Dusulfococcus and to sequences of the incomplete oxidizers from the Desulfobulbaceae family. Diversity and abundance of dsrA genes signifi cantly differed between the samples from the oxycline waters and the surface sediments of Lake Suigetsu, indicating habitat-specifi c SRB communities may contribute to the biogeochemical cycling of carbon and sulfur.

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Section: Introductionmentioning

confidence: 99%

Comparison of the diversity of sulfate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake

Kondo

Butani

2007

Limnology

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“…Lake Suigetsu is a meromictic lake in Fukui, Japan, characterised by a permanent oxycline at a depth between 5 and 8 m separating the aerobic freshwater epilimnion from the anaerobic, saline, sulphidogenic hypolimnion (Kondo et al 2000, Matsuyama 1973, Matsuyama & Saijo 1971, Takahashi & Ichimura 1968. Seawater from the Sea of Japan comes through Lakes Hiruga and Kugushi next to Lake Suigetsu.…”

Section: Introductionmentioning

confidence: 99%

“…Seawater from the Sea of Japan comes through Lakes Hiruga and Kugushi next to Lake Suigetsu. Thus the anoxic water chemistry of Lake Suigetsu is dominated by inorganic sulphur compounds with a high concentration of sulphate and steep gradients of sulphide at the chemocline (Kondo et al 2000, Matsuyama 1973, Matsuyama & Saijo 1971. Because Lake Suigetsu is highly sulphidic, we assume microbiological sulphate reduction is responsible for the production of sulphide.…”

Section: Introductionmentioning

confidence: 99%

Abundance and diversity of sulphate-reducing bacterioplankton in Lake Suigetsu, a meromictic lake in Fukui, Japan

Kondo¹,

Osawa²,

Mochizuki³

et al. 2006

Plankton Benthos Res

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Abstract:The depth distribution of sulphate-reducing bacteria (SRB) in the water column of a meromictic lake, Lake Suigetsu, Fukui, Japan was investigated using quantitative competitive PCR targeting the gene coding for portions of the a-subunit of dissimilatory sulphite reductase (dsrA). The total bacterial cell density (DAPI count) was 5Ϫ13ϫ10 6 cells mL Ϫ1 in the water column of the lake with maximum abundance occurring at the oxic-anoxic interface layer. SRBwere not detected in oxic surface water using competitive PCR. SRB were found in the anoxic waters below the oxycline ranging from 10 4 to 10 5 cells mL Ϫ1 , accounting for 0.3-8.9% of the total bacteria. The SRB cell densities were higher than previously estimated using the most-probable-number (MPN) method. Sequencing of the cloned PCR product of dsrA showed the existence of different SRB groups in the anoxic water. The majority of the dsrA sequences were associated with the Desulfosarcina-Desulfococcus-Desulfonema group and members of the Desulfobulbaceae family.Other dsrA clones belonged to the Desulfomicrobium and Desulfovibrio species as well as to a deeply branched group in the dsrA tree with no representatives from previously isolated SRB groups. These SRB species appear to be important for the sulphur and carbon cycle in the anoxic waters of Lake Suigetsu.

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“…Freshwater enters Lake Suigetsu through Lake Mikata. Thus, the deeper layer of Lake Suigetsu stag nates and has become anoxic and a sulfidogenic environment (Matsuyama 1973, Kondo et al 2000.…”

Section: Sample Collection and Physico-chemical Analysesmentioning

confidence: 99%

Abundance and bacterivory of heterotrophic nanoflagellates in the meromictic Lake Suigetsu, Japan

Okamura¹,

Mori²,

Nakano³

et al. 2012

Aquat. Microb. Ecol.

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The abundance and bacterivory of heterotrophic nanoflagellates (HNF) were seasonally followed in the oxic and anoxic layers of the meromictic Lake Suigetsu between May 2008 and November 2010. The HNF abundance in the anoxic layer was always lower than in the oxic layer during the study period. Ingestion of fluorescently labeled 0.5 µm diameter beads by the anaerobic HNF in the anoxic layer indicated bacterivory by HNF. The specific ingestion rates in the anoxic layers were generally similar to those taken from the oxic layer, with some exceptions. Our data thus suggested that anaerobic HNF were bacterial consumers with high potential bacterivory comparable to that of aerobic HNF in Lake Suigetsu. Bacterial turnover rates by HNF grazing in the oxic layer were estimated to be as high as ~10% d −1 of the bacterial standing stock. In contrast, the rates in the anoxic layer were <1% d −1 due to the low density of HNF in the anoxic layer. Our data thus provide a valuable contribution to understanding the structure and function of microbial food webs in anoxic aquatic environments.

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Changes in the limnological features of a meromictic Lake Suigetsu during the years, 1926–1967

Cited by 35 publications

References 7 publications

Comparison of the diversity of sulfate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake

Comparison of the diversity of sulfate-reducing bacterial communities in the water column and the surface sediments of a Japanese meromictic lake

Abundance and diversity of sulphate-reducing bacterioplankton in Lake Suigetsu, a meromictic lake in Fukui, Japan

Abundance and bacterivory of heterotrophic nanoflagellates in the meromictic Lake Suigetsu, Japan

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