Spatial patterns and co-occurrence networks of microbial communities related to environmental heterogeneity in deep-sea surface sediments around Yap Trench, Western Pacific Ocean
Spatial patterns and co-occurrence networks of microbial communities related to environmental heterogeneity in deep-sea surface sediments around Yap Trench, Western Pacific Ocean
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西太平洋雅浦海沟深海表层沉积物中与环境异质性相关的微生物群落空间格局和共生网络
DOI：
10.1016/j.scitotenv.2020.143799
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发表时间：
2020
影响因子：
9.8
通讯作者：
Yong Jiang
中科院分区：
文献类型：
--
作者：
Chenru Zhang;Qian Liu;Xianrong Li;Min Wang;Xiaoshou Liu;Jinpeng Yang;Jishang Xu;Yong Jiang
微生物群落是深海和半深海底栖环境的重要组成部分，特别是在YAP海沟等深海区域，它们在其独特的生态系统中提供持续的营养和能量来源。然而，由于采样困难，这些微生物群落的研究相对较少。2017年夏季，在西太平洋雅普海沟周围(大部分在西卡罗来纳盆地)的21个站采集了沉积物样本，深度从3156到7837米不等。深水和浅水深度的沉积物样本在有机质含量、中值粒度、粉质粘土含量和生物多样性方面存在差异。表层沉积物中微生物群落结构与环境因子关系明显，其共生网络具有明显的空间格局。此外，对于原核生物或真核生物，包括粉质粘粒含量、有机质含量、中值粒度和深度在内的变量组合对群落结构的影响最大。值得注意的是，真菌在深水沉积物样品的共生网络中起着重要作用，而细菌在浅水沉积物样品的共生网络中占主导地位。不同网络在结构和生态位上的差异是由于沉积物结构和有机质含量的差异所致。由于粘土对细菌的多样性有积极的影响，所以对真菌也有间接的积极影响，导致了不同类群之间的生物多样性差异。更多的有机质意味着有更多的养分可用于微生物的生长和繁殖，这导致生态位重叠较少。这项研究对西太平洋YAP海沟周围的表层沉积物进行了广泛和系统的测序调查，深入了解了深海底栖生态系统中微生物对环境异质性的反应。
Microbial communities are a large component of abyssal and hadal benthic environments, especially in deep-sea areas like Yap Trench, they provide a continuous source of nutrients and energy in their unique ecosystems. However, due to sampling difficulties, these microbial communities are relatively understudied. In the summer of 2017, sediment samples were collected from 21 stations around Yap Trench in the Western Pacific Ocean (mostly in the West Caroline Basin), at depths ranging from 3156 to 7837 m. Sediment samples from deep water depths and shallow water depths differed in organic matter content, median grain size, silt-clay content, and biodiversity. The structure of the microbial communities in the surface sediments had distinct relationships with environmental factors and their co-occurrence networks exhibited a clear spatial pattern. In addition, for both prokaryotes or eukaryotes, a combination of variables including silt-clay content, organic matter content, median grain size, and depth had the greatest impact on community structure. It was notable that fungi played important roles in the co-occurrence networks of deep water depth sediment samples while bacteria dominated those of shallow water depth samples. The differences in structure and ecological niches in the different networks were due to differences in sediment texture and organic matter content. Since clay had a positive effect on the diversity of bacteria, it had an indirect positive effect on fungi, leading to differences in biodiversity among different groups. More organic matter meant more nutrients were available for the growth and reproduction of microbes, which led to fewer niche overlaps. This study conducted an extensive and systematic sequencing survey of surface sediments around Yap Trench in the Western Pacific Ocean, providing insight into microbial responses to environmental heterogeneity in deep-sea benthic ecosystems.