Combined niche and neutral effects in a microbial wastewater treatment community
Combined niche and neutral effects in a microbial wastewater treatment community
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DOI：
10.1073/pnas.1000604107
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发表时间：
2010-08-31
影响因子：
11.1
通讯作者：
Sloan, William T.
中科院分区：
文献类型：
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作者：
Ofiteru, Irina Dana;Lunn, Mary;Sloan, William T.
长期以来，人们一直认为微生物群落中分类群相对丰度的差异反映了环境条件的差异。本研究表明，在污水处理厂具有经济和环境重要性的微生物群落中，种群动态与中性群落组装一致，其中偶然和随机移民在形成群落中起着重要且可预测的作用。利用动态观察，我们展示了一个简单的校准纯中性模型和一个简约的方法，以纳入环境对单个分类群的繁殖（或出生）率的影响。校正后的模型参数在生物学上是合理的，异养群落的种群流动率和多样性高于氨氧化菌（AOB），并且向AOB群落的迁移量相对较高。当环境因素被纳入观察结果时，可以解释更多的差异，但移民和随机繁殖和死亡仍然是决定共同分类群相对丰度的主要驱动因素。因此，我们建议中性群落模型应该是任何开放生物系统描述的基础。
It has long been assumed that differences in the relative abundance of taxa in microbial communities reflect differences in environmental conditions. Here we show that in the economically and environmentally important microbial communities in a wastewater treatment plant, the population dynamics are consistent with neutral community assembly, where chance and random immigration play an important and predictable role in shaping the communities. Using dynamic observations, we demonstrate a straightforward calibration of a purely neutral model and a parsimonious method to incorporate environmental influence on the reproduction (or birth) rate of individual taxa. The calibrated model parameters are biologically plausible, with the population turnover and diversity in the heterotrophic community being higher than for the ammonia oxidizing bacteria (AOB) and immigration into AOB community being relatively higher. When environmental factors were incorporated more of the variance in the observations could be explained but immigration and random reproduction and deaths remained the dominant driver in determining the relative abundance of the common taxa. Consequently we suggest that neutral community models should be the foundation of any description of an open biological system.