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首页> 外文期刊>Limnology >Comparison of the exploitation of methane-derived carbon by tubicolous and non-tubicolous chironomid larvae in a temperate eutrophic lake
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Comparison of the exploitation of methane-derived carbon by tubicolous and non-tubicolous chironomid larvae in a temperate eutrophic lake

机译：温带富营养化湖泊中微管和非微管尺虫幼虫对甲烷源碳的开采比较

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Carbon and nitrogen stable isotope ratios (δ~(13)C and δ~(15)N) in three sympatric species of larval chironomids were analyzed in a temperate eutrophic shallow lake in Japan. Markedly lower δ~(13)C values were reported in Chironomus plumosus (-51.2 ‰) and Tanypus sp. (-43.5 ‰) than those in photoautotrophic carbon sources [particulate organic matter (POM) and sediment]. There were positive correlations between δ~(13)C and δ~(15)N in the two chironomid species. These results indicated that they assimilated carbon derived from biogenic methane by exploiting methane-oxidizing bacteria (MOB). In contrast, Propsilocerus akamusi exhibited similar δ~(13)C values to those of POM or sediment. A δ~(13)C-based isotope mixing model was used to estimate the dietary contributions of MOB to each chironomid species. The mean contributions ranged from 11 to 15 % in C. plumosus, 13 to 19 % in Tanypus sp., but only up to 5 % in P. akamusi. In an aquarium, we observed that individuals of C. plumosus and Tanypus sp., which exhibited low δ~(13)C values, built U-shaped larval tubes in the sediment, and an oxidized layer developed around these tubes. Propsilocerus akamusi did not exhibit this behavior. These results suggest that tube building may provide larval chironomids with greater access to methane-derived carbon through increased opportunities to feed on MOB.
机译：在日本的温带富营养化浅水湖泊中，分析了三种同卵幼体天性昆虫的碳和氮稳定同位素比（δ〜（13）C和δ〜（15）N）。 Chironomus plumosus（-51.2‰）和Tanypus sp。的δ〜（13）C值明显较低。 （-43.5‰）高于光养植物碳源[颗粒有机物（POM）和沉积物]。两种手性物种的δ〜（13）C和δ〜（15）N呈正相关。这些结果表明，他们通过利用甲烷氧化细菌（MOB）吸收了生物甲烷中的碳。相比之下，赤尾柏具有与POM或沉积物相似的δ〜（13）C值。基于δ〜（13）C的同位素混合模型估计了MOB对每种手性物种的饮食贡献。 C. plumosus的平均贡献范围为11％至15％，Tanypus sp。的平均贡献范围为13％至19％，而A. musmusi则仅为5％。在一个水族箱中，我们观察到了C. plumosus和Tanypus sp。个体，它们表现出较低的δ〜（13）C值，在沉积物中建立了U形幼虫管，并在这些管周围形成了氧化层。 Propsilocerus akamusi没有表现出这种行为。这些结果表明，通过增加以MOB为食的机会，管材构建可以为幼体尺虫提供更多的甲烷衍生碳。

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