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首页> 外文期刊>Marine biology >Trophic Specialisation Of Metazoan Meiofauna At The Hakon Mosby Mud Volcano: Fatty Acid Biomarker Isotope Evidence
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Trophic Specialisation Of Metazoan Meiofauna At The Hakon Mosby Mud Volcano: Fatty Acid Biomarker Isotope Evidence

机译：在Hakon Mosby泥火山的后生动物Meofafuna的营养特化：脂肪酸生物标志物同位素证据

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摘要

We report the results of a detailed investigation on the trophoecology of two dominant meiofaunal species at the Hakon Mosby Mud Volcano (HMMV), a deep-sea cold methane-venting seep. Analyses of fatty acids (FAs) and their stable carbon isotopes were used to determine the importance of chemosynthetic nutritional pathways for the dominant copepod species (morphologically very similar to Tisbe wilsoni) inhabiting the volcano's centre and the abundant nematode Halomonhystera disjuncta from the surrounding microbial mats. The strong dominance of bacterial biomarkers (16:lω7c, 18:lω7c and 16:lω8c) coupled with their individual light carbon isotopes signatures (δ~(13)C ranging from -52 to - 81‰) and the lack of symbiotic relationships with prokaryotes (as revealed by molecular analyses and fluorescent in situ hybridisation) indicated that chemosynthetically derived carbon constitutes the main diet of both species. However, the copepod showed a stronger reliance on the utilisation of methanotrophic bacteria and contained polyunsaturated FAs of bacterial origin (20:5ω3 and 22:6ω3 with isotope signatures δ~(13)C < -80‰). Instead, the FA profiles of H. disjuncta suggested that sulphide-oxidising bacteria constituted the main diet of this nematode. Therefore, HMMV can be regarded as a persistent deep-sea cold seep, allowing a chemosynthesis-based trophic specialisation by the dominant meiofaunal species inhabiting its sediments. The present investigation, through the determination of the fatty acid profiles, provides the first evidence for trophic specialisation of meiofauna associated with sub-habitats within a cold seep.
机译：我们报告了对深海冷甲烷排放深处的哈孔莫斯比泥火山（HMMV）的两个优势气代植物的营养生态学的详细调查结果。脂肪酸（FAs）及其稳定的碳同位素分析用于确定化学合成营养途径对居住在火山中心和周围微生物垫中大量线虫分离的Halomonhystera disjuncta的优势co足类（形态上与Tisbe wilsoni非常相似）的重要性。细菌生物标记物（16：lω7c，18：lω7c和16：lω8c）的显性优势以及它们各自的轻碳同位素特征（δ〜（13）C在-52至-81‰之间）和与它们之间缺乏共生关系原核生物（通过分子分析和荧光原位杂交显示）表明，化学合成衍生的碳构成了这两种物种的主要食物。然而，the足类动物对甲烷营养细菌的利用更强，并且含有细菌来源的多不饱和脂肪酸（20：5ω3和22：6ω3，同位素特征为δ〜（13）C <-80‰）。取而代之的是，分离线虫的FA谱表明，硫化物氧化细菌构成了该线虫的主要食物。因此，HMMV可以被认为是持续的深海冷渗漏，允许通过化学合成为基础的营养专业化，其主要是沉积在其沉积物中的主要动植物物种。通过确定脂肪酸谱，本研究为与冷渗漏中的亚生境有关的鱼类动物专门化提供了第一个证据。

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