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. 2009 May 29;75(14):4727–4735. doi: 10.1128/AEM.00667-09

TABLE 1.

Phylogenetic clustering among communities using abundance-weighted genotypesc

Sample group analyzeda Sampleb No. of genotypes MPD NRI MPD quantile MNTD NTI MNTD quantile
Host A 9 0.28 0.91 0.20 0.13 0.95 0.14
H 22 0.29 2.21 0.02 0.07 1.66 0.01
M 24 0.57 0.16 0.41 0.14 0.78 0.23
S 29 0.36 1.01 0.18 0.06 1.23 0.01
Nod/root Nod 25 0.20 2.27 0.01 0.04 1.52 0.00
Root 51 0.60 −0.36 0.63 0.09 0.83 0.19
Nod/old/tip Nod 25 0.20 2.37 0.00 0.04 1.55 0.00
Old 23 0.54 0.69 0.24 0.10 2.12 0.01
Tip 40 0.61 −0.57 0.71 0.11 0.27 0.46
Host+nod/root A nod 4 0.04 2.16 0.00 0.05 1.45 0.00
A root 5 0.55 −0.79 0.77 0.41 −0.61 0.74
H nod 9 0.13 2.50 0.00 0.06 1.87 0.00
H root 16 0.53 0.47 0.30 0.13 1.89 0.03
M nod 11 0.48 0.50 0.29 0.10 2.15 0.01
M root 16 0.60 −0.27 0.58 0.26 −1.07 0.85
S nod 8 0.09 2.36 0.00 0.05 1.61 0.00
S root 25 0.58 −0.42 0.64 0.08 1.86 0.00
Host+nod/old/tip A nod 4 0.04 2.16 0.00 0.05 1.45 0.00
A old 4 0.56 −1.00 0.83 0.57 −1.35 0.91
A tip 1
H nod 9 0.13 2.51 0.00 0.06 1.88 0.00
H old 10 0.50 0.54 0.28 0.18 1.33 0.09
H tip 9 0.50 0.34 0.36 0.16 1.63 0.05
M nod 11 0.48 0.50 0.29 0.10 2.19 0.01
M old 2 0.32 −0.33 0.52 0.72 −0.33 0.52
M tip 14 0.63 −0.63 0.73 0.31 −1.41 0.92
S nod 8 0.09 2.36 0.00 0.05 1.61 0.00
S old 10 0.47 0.65 0.24 0.10 2.22 0.01
S tip 21 0.59 −0.55 0.68 0.09 1.75 0.01
a

Host, the four host species; Nod/root, nodules versus root surface; Nod/old/tip, nodules versus root tips versus old (mature) roots; Host+nod/root, host species subdivided by nodules versus root surface; and Host+nod/old/tip, host species subdivided by nodules versus root tips versus old roots.

b

A, L. angustissimus; M, L. micranthus; H, L. heermannii; S, L. strigosus; nod, nodule samples; root, root surface samples; tip, root surface samples from the distal 1 cm of the root; old, root surface samples from proximal (non-tip) root sections.

c

“No. of genotypes” indicates number of genotypes in each community; MPD quantile, quantile of observed MPD versus 1,000 randomly generated communities (<0.05 indicates statistically significant clustering); MNTD, mean nearest taxon distance of the analyzed taxa; NTI, nearest taxon index; MNTD quantile, quantile of observed MPD versus 1,000 randomly generated communities (<0.05 indicates statistically significant clustering). Statistically significant values of MPD and MNTD (quantile < 0.05) are bold.