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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Curr Opin Microbiol. 2018 Jul 27;44:61–69. doi: 10.1016/j.mib.2018.07.002

Figure 3.

Figure 3.

Broader sampling improves abstract maps of the microbial world in the Earth Microbiome Project, even with low resolution. All panels show principal coordinates analysis of unweighted UniFrac distances between samples. (A) Samples rarefied to 500,000 sequences, showing only those exceeding this threshold sampling depth. (B) Samples rarefied to 1000 sequences. (C) Samples rarefied to 200 sequences. Even with few observations per sample, the overall relationships among sample types are preserved; in contrast, the overall pattern is lost with too few samples no matter how exquisitely characterized.