Abstract
The role of environmental selection in governing the structure of communities of freshwater sulfur bacteria (Achromatium spp) was experimentally tested by mixing sediments from two geographically separated lakes (Rydal Water (RY) and Hell Kettles (HK)) that harboured Achromatium spp. Community profiles of Achromatium spp in sediment microcosms at day 0 and after 60 days were compared to determine whether initial Achromatium community composition or subsequent selection by the sediment environment had greater influence in dictating the final Achromatium community structure. It was found that Achromatium spp from the HK community became established in mixed sediments at the expense of members of the RY community. This selection for the HK Achromatium community was more pronounced when sediment composition was manipulated to resemble HK sediments. Our findings definitively demonstrate that environmental selection is the primary determinant of Achromatium community structure in these sediments.
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Acknowledgements
This work was supported by Grant F/00125/D from the Leverhulme Trust. We are greatly indebted to Tom Wagner for critically reviewing earlier versions of the manuscript.
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Gray, N., Brown, A., Nelson, D. et al. The biogeographical distribution of closely related freshwater sediment bacteria is determined by environmental selection. ISME J 1, 596–605 (2007). https://doi.org/10.1038/ismej.2007.74
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DOI: https://doi.org/10.1038/ismej.2007.74
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