Abiotic environmental factors override phytoplankton succession in shaping both free-living and attached bacterial communities in a highland lake

被引：13

作者：

Wang, Huan ^{[1
]}

Zhu, Rong ^{[1
]}

Zhang, Xiaolin ^{[1
]}

Li, Yun ^{[1
,2
]}

Ni, Leyi ^{[1
]}

Xie, Ping ^{[1
,3
]}

Shen, Hong ^{[1
]}

机构：

[1] Chinese Acad Sci, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol China, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China

[2] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China

[3] Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China

来源：

AMB EXPRESS | 2019年 / 9卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Abiotic environmental factors; Attached bacteria; Free-living bacteria; Phytoplankton community; Variation partitioning in redundancy analysis; DIVERSITY; DYNAMICS; ABUNDANCE; GRADIENT; TAIHU; ALGAE; ASSEMBLAGES; VARIABILITY; COMPETITION; TRANSITION;

D O I：

10.1186/s13568-019-0889-z

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Bacterial communities are an important part of biological diversity and biogeochemical cycling in aquatic ecosystems. In this study, the relationship amongst the phytoplankton species composition and abiotic environmental factors on seasonal changes in the community composition of free-living and attached bacteria in Lake Erhai were studied. Using Illumina high-throughput sequencing, we found that the impact of environmental factors on both the free-living and attached bacterial community composition was greater than that of the phytoplankton community, amongst which total phosphorus, Secchi disk, water temperature, dissolved oxygen and conductivity strongly influenced bacterial community composition. Microcystis blooms associated with subdominant Psephonema occurred during the summer and autumn, and Fragilaria, Melosira and Mougeotia were found at high densities in the other seasons. Only small numbers of algal species-specific bacteria, including Xanthomonadaceae (Proteobacteria) and Alcaligenaceae (Betaproteobacteria), were tightly coupled to Microcystis and Psephonema during Microcystis blooms. Redundancy analysis showed that although the composition of the bacterial communities was controlled by species composition mediated by changes in phytoplankton communities and abiotic environmental factors, the impact of the abiotic environment on both free-living and attached bacterial community compositions were greater than the impact of the phytoplankton community. These results suggest that the species composition of both free-living and attached bacterial communities are affected by abiotic environmental factors, even when under strong control by biotic factors, particularly dominant genera of Microcystis and Psephonema during algal blooms.

引用

页数：13