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. 2013 Jun 24;13:146. doi: 10.1186/1471-2180-13-146

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Copyright © 2013 Flynn et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nonmetric multidimensional scaling (MDS) ordination of the Bray-Curtis similarity coefficient for communities of archaea and bacteria in the Mahomet aquifer. Attached samples (filled markers) are of microbes that colonized in situ sampler sediment while suspended samples (open markers) were filtered from groundwater as it was pumped from the aquifer. For MDS analysis, sequences across all communities with 97% or greater sequence similarity were binned into operational taxonomic units (OTUs). The stress indicated in the upper right corner is the amount of strain imposed on the ordination when fitting it into two dimensions.