Warming and nutrient enrichment in combination increase stochasticity and beta diversity of bacterioplankton assemblages across freshwater mesocosms

被引:61
作者
Ren, Lijuan [1 ,2 ]
He, Dan [1 ]
Chen, Zhen [1 ]
Jeppesen, Erik [3 ,4 ]
Lauridsen, Torben L. [3 ,4 ]
Sondergaard, Martin [3 ,4 ]
Liu, Zhengwen [1 ,4 ,5 ]
Wu, Qinglong L. [1 ,4 ,5 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing, Jiangsu, Peoples R China
[2] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol LMB, Guangzhou, Guangdong, Peoples R China
[3] Aarhus Univ, Dept Biosci, Silkeborg, Denmark
[4] Univ Chinese Acad Sci, Sinodanish Ctr Educ & Res, Beijing, Peoples R China
[5] Jinan Univ, Dept Ecol, Guangzhou, Guangdong, Peoples R China
基金
美国国家科学基金会;
关键词
CLIMATE-CHANGE; GLOBAL BIODIVERSITY; LAKE; TEMPERATURE; SHALLOW; COMMUNITIES; SHIFTS; BIOGEOGRAPHY; PHOSPHORUS; GRADIENT;
D O I
10.1038/ismej.2016.159
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The current climate warming and eutrophication are known to interactively threaten freshwater biodiversity; however, the interactive effects on lacustrine bacterioplankton diversity remain to be determined. Here, we analyzed the spring bacterioplankton community composition (BCC) in 24 outdoor, flow-through mesocosms (mimicking shallow lake environments) under 3 temperature scenarios and 2 nutrient regimes. Our results revealed that neither long-term warming (8.5 years) nor nutrient enrichment had significant effects on bacterioplankton alpha diversity, whereas long-term enhanced warming (elevated 50% above the IPCC A2 climate scenario) and nutrient enrichment in combination increased bacterioplankton beta diversity. We also found that BCC shifted significantly under enhanced warming and nutrient-enriched conditions towards decreased relative abundances of Actinobacteria, Bacteroidetes and Betaproteobacteria, whereas the percentages of Cyanobacteria, total rare phyla and unclassified phyla significantly increased. Null-model tests indicated that deterministic processes played a more important role than stochastic processes in determining BCC. However, the relative importance of stochasticity, primarily ecological drift, was enhanced and contributed to the increased beta diversity of BCC under enhanced warming and nutrient-enriched conditions. Overall, our study suggests that the synergetic effects of warming and nutrient enrichment may result in high variability in the composition of bacterioplankton communities in lacustrine water bodies.
引用
收藏
页码:613 / 625
页数:13
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