Table 4

Mann–Whitney test between genes that do not show signals of population differentiation (Group 1, 47 genes) and genes that show signatures of population differentiation (Group 2, 10 genes), for each of the node centrality measured
Rank Sum (Group 1) Rank Sum (Group2) U Z p-level
Betweenness 1425.50 227.50 172.50 1.32 0.1885
Centroid 1357.50 295.50 229.50 −0.12 0.9078
Closeness 1404.50 248.50 193.50 0.87 0.3830
Eccentricity 1485.00 168.00 113.00 2.59 0.0097**
Node Degree 1254.00 399.00 126.00 −2.33 0.0196*

A p-value < 0.05 for a centrality measure would indicate that genes belonging to the two groups have different values for that centrality measure. Only Eccentricity remains marginally significant after a Bonferroni correction is applied.

Dall’Olio et al.

Dall’Olio et al. BMC Evolutionary Biology 2012 12:98   doi:10.1186/1471-2148-12-98

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