Berga Mercè, Zha Yinghua, Székely Anna J, Langenheder Silke
Department of Ecology and Genetics/Limnology, Evolutionary Biology Centre, Uppsala UniversityUppsala, Sweden.
Biological Oceanography, Leibniz Institute for Baltic Sea Research WarnemündeRostock, Germany.
Front Microbiol. 2017 Jun 8;8:948. doi: 10.3389/fmicb.2017.00948. eCollection 2017.
Disturbances and environmental change are important factors determining the diversity, composition, and functioning of communities. However, knowledge about how natural bacterial communities are affected by such perturbations is still sparse. We performed a whole ecosystem manipulation experiment with freshwater rock pools where we applied salinity disturbances of different intensities. The aim was to test how the compositional and functional resistance and resilience of bacterial communities, alpha- and beta-diversity and the relative importance of stochastic and deterministic community assembly processes changed along a disturbance intensity gradient. We found that bacterial communities were functionally resistant to all salinity levels (3, 6, and 12 psu) and compositionally resistant to a salinity increase to 3 psu and resilient to increases of 6 and 12 psu. Increasing salinities had no effect on local richness and evenness, beta-diversity and the proportion of deterministically vs. stochastically assembled communities. Our results show a high functional and compositional stability of bacterial communities to salinity changes of different intensities both at local and regional scales, which possibly reflects long-term adaptation to environmental conditions in the study system.
干扰和环境变化是决定群落多样性、组成和功能的重要因素。然而，关于自然细菌群落如何受到此类扰动影响的知识仍然匮乏。我们在淡水岩石池中进行了一项全生态系统操纵实验，在实验中施加了不同强度的盐度干扰。目的是测试细菌群落的组成和功能抗性与恢复力、α-和β-多样性以及随机和确定性群落组装过程的相对重要性如何沿干扰强度梯度变化。我们发现细菌群落对所有盐度水平（3、6和12 psu）具有功能抗性，对盐度增加到3 psu具有组成抗性，对盐度增加到6和12 psu具有恢复力。盐度增加对局部丰富度和均匀度、β-多样性以及确定性与随机组装群落的比例没有影响。我们的结果表明，细菌群落在局部和区域尺度上对不同强度的盐度变化具有很高的功能和组成稳定性，这可能反映了对研究系统中环境条件的长期适应。
