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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Nat Methods. 2010 Sep 5;7(10):813–819. doi: 10.1038/nmeth.1499

Figure 2.

Figure 2

Comparison of different gradient methods on the soil dataset, a simulated gradient dataset with or without noise. Axes represent the first two principal coordinates maximizing the variance in the data, obtained via PCoA (the percentage of the total variance explained by each axis is shown in parentheses). Each data point is a microbial community sample, colored according to either a real gradient (soil pH) or a simulated gradient (arbitrary units). For simulated data, sequencing depth was 1,000 sequences per sample, and species rank-abundance distributions were fit from empirical data.