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首页> 外文期刊>Limnology >Seasonal increase of methane in sediment decreases δ13C of larval chironomids in a eutrophic shallow lake
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Seasonal increase of methane in sediment decreases δ13C of larval chironomids in a eutrophic shallow lake

机译：富营养化浅水湖泊中沉积物甲烷的季节性增加降低了幼体鱼鳞虫的δ13 C

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摘要

Recent studies have shown that larval chironomids assimilate 13C-depleted carbon derived from biogenic methane by feeding on methane-oxidizing bacteria (MOB). The dietary contribution of MOB is known to be maximized in the autumn overturn period or winter in eutrophic dimictic lakes due to the increase of MOB biomass following the supply of oxygenated water, but in polymictic lakes, such seasonal variability has not been revealed. We investigated the seasonal patterns of larval δ13C and methane concentrations in the sediment of a eutrophic polymictic lake, Izunuma, Japan. Larval δ13C decreased in late summer and autumn. Methane concentrations above a 6 cm depth peaked in late summer or autumn, while those in the 10–11- and 20–21-cm layers peaked in October. Negative correlations between methane concentrations in the 5–6/10–11-cm layers and larval δ13C were found. This suggests that an increase in the supply of methane stimulated the activity of MOB in a polymictic lake, where water above the lake bottom rarely became anoxic because of frequent overturn, thus increasing the dietary contribution of MOB to larval chironomids.
机译：最近的研究表明，幼虫手性虫以甲烷氧化细菌（MOB）为食，吸收了来自生物甲烷的13 C-贫碳。已知在富营养化的干缩湖泊中，MOB的饮食贡献在秋季翻转季节或冬季达到最大，这是由于在供给含氧水之后MOB的生物量增加，但是在多种湖泊中，这种季节性变化尚未发现。我们调查了日本伊豆沼市富营养化多湖泊湖沉积物中幼虫δ13C和甲烷浓度的季节性变化。夏末和秋季幼虫δ13 C下降。深度在6厘米以上的甲烷浓度在夏末或秋季达到峰值，而10-11厘米和20-21厘米的甲烷浓度在10月达到峰值。发现5–6 / 10–11-cm层中甲烷浓度与幼虫δ13 C之间呈负相关。这表明甲烷供应量的增加刺激了多学科湖中MOB的活动，在该湖中，由于频繁翻倒，湖底上方的水很少变成缺氧的，因此增加了MOB对幼体猫科动物的饮食贡献。

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  • 来源
    《Limnology》 |2012年第1期|p.107-116|共10页
  • 作者

    Natsuru Yasuno; Shuichi Shikano; Ayumi Muraoka; Tetsuo Shimada; Toyoaki Ito; Eisuke Kikuchi;

  • 作者单位

    Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan;

    Center for Northeast Asian Studies, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai, Miyagi, 980-8576, Japan;

    Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan;

    Miyagi Prefectural Izunuma-Uchinuma Environmental Foundation, 17-2 Shikimi, Wakayanagi, Kurihara, Miyagi, 989-5504, Japan;

    Field Science Center, Graduate School of Agricultural Science, Tohoku University, 232-3 Yomogida, Naruko-Onsen, Osaki, Miyagi, 989-6711, Japan;

    Environmental Education Center, Miyagi University of Education, 149 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-0845, Japan;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Chironomid; Stable isotope; Methane; Shallow lake; Methane-oxidizing bacteria;

    机译：尺虫;稳定同位素;甲烷;浅湖;甲烷氧化细菌;

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