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Microbial Diversity in Sub-Seafloor Sediments from the Costa Rica Margin

机译：哥斯达黎加边缘海底沉积物中的微生物多样性

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摘要

The exploration of the deep biosphere continues to reveal a great diversity of microorganisms, many of which remain poorly understood. This study provides a first look at the microbial community composition of the Costa Rica Margin sub-seafloor from two sites on the upper plate of the subduction zone, between the Cocos and Caribbean plates. Despite being in close geographical proximity, with similar lithologies, both sites show distinctions in the relative abundance of the archaeal domain and major microbial phyla, assessed using a pair of universal primers and supported by the sequencing of six metagenomes. Elusimicrobia , Chloroflexi , Aerophobetes , Actinobacteria , Lokiarchaeota , and Atribacteria were dominant phyla at Site 1378, and Bathyarchaeota , Chloroflexi , Hadesarchaeota , Aerophobetes , Elusimicrobia , and Lokiarchaeota were dominant at Site 1379. Correlations of microbial taxa with geochemistry were examined and notable relationships were seen with ammonia, sulfate, and depth. With deep sediments, there is always a concern that drilling technologies impact analyses due to contamination of the sediments via drilling fluid. Here, we use analysis of the drilling fluid in conjunction with the sediment analysis, to assess the level of contamination and remove any problematic sequences. In the majority of samples, we find the level of drilling fluid contamination, negligible.
机译：深入生物圈的探索继续揭示出微生物的多样性，其中许多微生物仍然知之甚少。这项研究提供了从俯冲带上板中两个位于科科斯和加勒比板块之间的地点哥斯达黎加边缘海底微生物群落组成的初步观察。尽管地理位置接近，具有相似的岩性，但两个位点在古细菌域和主要微生物门的相对丰度方面均表现出差异，使用一对通用引物进行评估并得到六个元基因组的测序支持。 Elusimicrobia，Chloroflexi，Aerophobetes，放线菌，Lokiarchaeota和土壤杆菌是站点1378的优势种群，Bathyarchaeota，Chloroflexi，Hadesarchaeota，Aerophobetes，Elusimicrobia和Lokiarchaeota在站点1379占主导地位。见过氨，硫酸盐和深度。对于深层沉积物，由于钻井液对沉积物的污染，钻井技术会影响分析。在这里，我们结合对钻井液的分析和沉积物分析，来评估污染程度并消除任何有问题的序列。在大多数样本中，我们发现钻井液的污染水平可以忽略不计。

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