Niche partitioning of microbial communities in riverine floodplains
Niche partitioning of microbial communities in riverine floodplains
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DOI：
10.1038/s41598-019-52865-4
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发表时间：
2019-11
影响因子：
4.6
通讯作者：
M. Peipoch;Scott R. Miller;T. Antão;H. Valett
中科院分区：
文献类型：
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作者：
M. Peipoch;Scott R. Miller;T. Antão;H. Valett
河漫滩由于其生物物理的复杂性而表现出高度的植物和动物多样性。将这种生态位划分过程扩展到微生物群落远没有得到解决或支持。在这里，我们评估了水生生物膜多样性的环境梯度在10个河流漫滩不同程度的流量变化和栖息地的多样性，以评估复杂的漫滩是否支持生物膜群落更大的生物多样性和物种的相互作用。在来自62个水生栖息地的116个样本中，没有发现显著的证据支持栖息地多样性在促进微生物多样性方面的核心作用，因为在10个洪泛区中，α（H '：2.8-4.1）和β（Sørensen：0.3-0.39）多样性都与洪泛区复杂性呈正相关。相比之下，我们的研究结果记录了生物膜社区的敏感性，区域模板表现为梯度的碳，氮，磷的可用性。反映氮限制的大规模条件增加了固氮蓝藻的相对丰度（高达0.34总读数的分数），限制了细菌类群之间的相互作用的总数，并加强了消极的积极相互作用，产生独特的微生物群落和网络，反映了大规模的物种分选响应区域地球化学梯度。
Riverine floodplains exhibit high floral and faunal diversity as a consequence of their biophysical complexity. Extension of such niche partitioning processes to microbial communities is far less resolved or supported. Here, we evaluated the responses of aquatic biofilms diversity to environmental gradients across ten riverine floodplains with differing degrees of flow alteration and habitat diversity to assess whether complex floodplains support biofilm communities with greater biodiversity and species interactions. No significant evidence was found to support a central role for habitat diversity in promoting microbial diversity across 116 samples derived from 62 aquatic habitats, as neither α (H’: 2.8–4.1) nor β (Sørensen: 0.3–0.39) diversity were positively related to floodplain complexity across the ten floodplains. In contrast, our results documented the sensitivity of biofilm communities to regional templates manifested as gradients of carbon, nitrogen, and phosphorous availability. Large-scale conditions reflecting nitrogen limitation increased the relative abundance of N-fixing cyanobacteria (up to 0.34 as fraction of total reads), constrained the total number of interactions among bacterial taxa, and reinforced negative over positive interactions, generating unique microbial communities and networks that reflect large-scale species sorting in response to regional geochemical gradients.