Flipping for Food: The Use of a Methane Seep by Tanner Crabs (Chionoecetes tanneri)
Flipping for Food: The Use of a Methane Seep by Tanner Crabs (Chionoecetes tanneri)
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DOI：
10.3389/fmars.2019.00043
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发表时间：
2019-02
影响因子：
3.7
通讯作者：
Sarah Seabrook;F. D. De Leo;A. Thurber
中科院分区：
文献类型：
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作者：
Sarah Seabrook;F. D. De Leo;A. Thurber
甲烷渗漏生境是分布广泛的以化学合成为基础的生态系统，横跨大陆边缘并与周围的海洋系统相互作用。由于这些生境中有许多位于200米以下，渗漏可作为食物有限的深海环境的重要营养来源。然而，掠夺性巨型动物吸收渗漏营养的潜力一直难以量化。在这里，我们提供了第一个证据的商业化收获的物种，Chionoeclamptanneri（坦纳蟹），同化化学合成的生产。尽管对C. Tanneri组织中没有可量化的渗漏源碳或硫的掺入（平均δ 13 C为-18.5‰;平均δ 34 S为19.5‰），脂肪酸（FA）化合物中的13 C减少（δ 13 C为-38.8 ‰）。此外，渗漏细菌的诊断生物标志物，包括16：1 × 10 - 6和18：1 × 10 - 8 c FA’s，被C. tanneri进一步支持渗漏与C.在某些情况下，tanneri，渗漏相关细菌和古细菌是螃蟹肠道内容物中的优势类群。这项工作首次揭示了渗漏生产与深海生态系统服务，特别是渔业生产之间的联系。此外，它揭示了一种方法上的偏见，可能存在于一些营养学研究中，散装同位素在掠夺动物的饮食中的渗透营养的作用。
Methane seep habitats are widespread chemosynthesis-based ecosystem that span continental margins and interact with surrounding marine systems. With many of these habitats occurring below 200m, seeps can serve as an important source of nutrients in otherwise food limited deep-sea environments. However, the potential for marauding megafauna to assimilate seep derived nutrition has been difficult to quantify. Here, we provide the first evidence of a commercially harvested species, Chionoecetes tanneri (tanner crab), assimilating chemosynthetic production. Although bulk isotope analysis of C. tanneri tissue indicated no quantifiable incorporation of seep-derived carbon or sulfur (mean δ13C, -18.5‰; mean δ34S, 19.5‰), depletions in 13C (δ13C as light as -38.8 ‰) were noted in fatty acid (FA) compounds. In addition, diagnostic biomarkers for seep bacteria, including 16:16 and 18:18c FA’s, were found to have been assimilated by C. tanneri. Futher supporting a trophic link between the seep and the C. tanneri, seep associated bacteria and archaea were, in certain cases, the dominant taxa in the gut contents of the crab. This work provides the first insights into a link between seep production and deep-sea ecosystem services, specifically fisheries production. In addition, it reveals a methodological bias that could exist in some trophic studies where bulk isotopes under-represent the role of seep nutrition in the diet of marauding animals.