Experimental tests of the bacterial distance-decay relationship
Experimental tests of the bacterial distance-decay relationship
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DOI：
10.1038/ismej.2010.77
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发表时间：
2010-11-01
期刊：
影响因子：
11
通讯作者：
Bell, Thomas
中科院分区：
文献类型：
--
作者：
Bell, Thomas
群落相似性下降，随着地理距离的增加，如果物种往往是当地适应或如果他们是扩散有限的。相似性的距离衰减以前已经被证明是细菌的，但是从观察调查中很难区分这些竞争机制。我发现很少有证据表明，在水生细菌群落中，地理距离和群落组成的相似性之间存在关系。当细菌定植发生到最初相同的无菌缩影在林地，一个强大的距离衰减关系后，观察到28天，这意味着扩散限制在这些社区中创建了一个强大的模式，在没有环境差异。这一结论没有得到相互移植实验结果的支持。当研究区域的末端的微观世界被移植到研究区域的另一端时，社区聚集在他们被移植到的网站上的社区组成。这种趋同并不取决于是否殖民到微观世界被阻止，这意味着在这些空间和时间尺度上的扩散限制的一个小角色。其他操作的殖民率是一致的假设，即传播限制，这些社区在短时间尺度（几天），但传播限制有一个较小的作用，在较长的时间尺度（47天）。The ISME Journal（2010）4，1357-1365; doi：10.1038/ismej.2010.77; 2010年6月10日在线发表
Community similarity declines with increasing geographic distance if species tend to be locally adapted or if they are dispersal limited. The distance-decay of similarity has been shown for bacteria previously, but distinguishing between these competing mechanisms is difficult from observational surveys. I found little evidence of a relationship between geographic distance and similarity in community composition in an aquatic bacterial community. When bacterial colonization occurred into initially identical sterile microcosms across a woodland, a strong distance-decay relationship was observed after 28 days, implying that dispersal limitation created a strong pattern in these communities in the absence of environmental differences. This conclusion was not supported by the results of a reciprocal transplant experiment. When microcosms at the extremities of the study area were transplanted to the opposite end of the study area, the communities converged on the community composition at the site to which they were transplanted. This convergence did not depend on whether colonization into the microcosms was prevented, implying a minor role for dispersal limitation over these spatial and temporal scales. Additional manipulations of colonization rates were consistent with the hypothesis that dispersal limitation structured these communities over short time scales (a few days), but that dispersal limitation had a minor role over longer time scales (47 days). The ISME Journal (2010) 4, 1357-1365; doi: 10.1038/ismej.2010.77; published online 10 June 2010