在北极地区的细菌共生物多样性入Oligobrachia siboglinids
Arunima Sen1,2, Gwenn Tanguy3, Pierre E Galand4
1Department of Arctic Biology, The University Centre in Svalbard (UNIS), Longyearbyen, Norway. arunimas@unis.no.
Animal microbiome
|June 1, 2023
概括
高度透虫 (Oligobrachia) 缺乏甲类共生体,这表明它们的低碳同位素值来自沉积物的碳吸收,而不是甲代谢. 营养主要以硫为基础.
科学领域:
- 海洋生物学 海洋生物学
- 微生物生态学 微生物生态学
- 化学合成 化学合成
背景情况:
- 高度的透区域主要由Oligobrachia siboglinid虫占据主导地位,它们通常是唯一的化学共生类别.
- 一个关键的生态问题是,这些虫是否拥有甲类共生体,由于同位素和分子数据相冲突而引起争论.
- 假设包括沉积物碳吸收或未检测到的甲类共生动物种群.
研究的目的:
- 为了调查北方透的Oligobrachia物种中甲类共生体的存在.
- 解决同位素特征和缺乏甲变型的直接证据之间的悖论.
主要方法:
- 在Oligobrachia webbi和Oligobrachia sp.中V3-V4区域的16S rRNA扩增序列测序. 在CPL-clade.
- 输送电子显微镜对体组织进行视觉化,以可视化共生细菌.
主要成果:
- 16S rRNA测序揭示了绝大多数硫化物氧化细菌,只有很小比例的甲氧化剂.
- 发现了氧化硫的细菌菌株,但并不特定于Oligobrachia物种.
- 在非巨体组织中大量的细菌被确定为可能的生菌或管居住.
结论:
- 巨体中没有甲类序列表明这些虫缺乏甲类共生体.
- 营养可能是基于硫的,低的δ13C值归因于沉积物的碳吸收.
- 内共生伙伴可能是局部确定,并代表总细菌序列的一小部分.
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