Community composition, co-occurrence, and environmental drivers of bacterioplankton community in surface and 50-m water layers in the subarctic North Pacific
Community composition, co-occurrence, and environmental drivers of bacterioplankton community in surface and 50-m water layers in the subarctic North Pacific
复制标题
北太平洋亚北极表层和50 m水层浮游细菌群落组成、共现和环境驱动因素
DOI：
10.1007/s00343-023-2367-3
复制
发表时间：
2023-09-23
影响因子：
1.6
通讯作者：
Li，Yan
中科院分区：
文献类型：
--
作者：
Xin，Quandong;Chen，Jufa;Li，Yan
亚北极西部环流（WSG）是北太平洋亚北极地区以高营养和低叶绿素水域著称的两个环流系统之一。然而，该地区海水中的浮游细菌，无论是在分类组成方面还是在功能结构方面，都处于相对未知的状态。该地区共采集了地表水（SW）和50 m层水（FW）两个水层的22个采样点。分析了水体理化参数、聚球菌、细菌密度，以及浮游细菌群落组成和分布格局。FW的DIN、DIP和DSi营养物质浓度、chl浓度和平均异菌丰度均高于SW。然而，西南地区的温度和聚球菌和微真核生物的平均丰度较高。共分配了3 269个otu，共有2 123个otu；此外，在SW和FW中观察到相似的α多样性模式。浮游细菌群落与盐度、DIP、DIN和Chlain均呈极显著相关。变形菌门、蓝藻门、拟杆菌门、放线菌门和厚壁菌门是主要门，而ynechococcus_cc9902、Psychrobacter和亚硫酸杆菌门是各样点的优势属。协同网络中otu之间的相关性多为正相关和模间相关。西南地区的边密度和图密度较高，表明西南地区的相关性较高，群落结构较为复杂。本研究对WSG浮游细菌群落结构及相关特征提供了新的认识。
The Western Subarctic Gyre (WSG) is one of the two gyre-systems in the subarctic North Pacific known for high nutrient and low-chlorophyll waters. However, the bacterioplankton in marine water of this area, either in terms of the taxonomic composition or functional structure, remains relatively unexplored. A total of 22 sampling sites from two water layers (surface water, SW and 50-m layer water, FW) were collected in this area. The physiochemical parameters of waters,Synechococcus, and bacterial density, as well as the bacterioplankton community composition and distribution pattern, were analyzed. The nutrient concentrations of DIN, DIP, and DSi, Chl-aconcentration, and the average abundance of heterobacteria in FW were higher than those in SW. However, temperature and the average abundance ofSynechococcusand pico-eukaryotes were higher in SW. A total of 3 269 OTUs were assigned, and 2 123 OTUs were commonly shared; moreover, similar alpha diversity patterns were observed in both SW and FW. The bacterioplankton community showed significantly obvious correlation with salinity, DIP, DIN, and Chlain both SW and FW. Proteobacteria, Cyanobacteria, Bacteroidota, Actinobacteriota, and Firmicutes were the main phyla whileSynechococcus_CC9902,Psychrobacter, andSulfitobacterwere the dominant genera in each sampling site. Most correlations that happened between the OTUs in the cooccurrence network were positive and inter-module. Higher edges and graph density were found in SW, indicating that more correlations occurred, and the community was more complex in SW. This study provided novel knowledge on the bacterioplankton community structure and the correlation characteristics in WSG.