Spearman rank correlation coefficients calculated between all the diversity indices.

<p>All correlations are significantly different from zero (with <i>p</i><0.01), except for underlined values. The Spearman coefficient distribution under null hypothesis was approximated by a normal distribution with mean equal to 0 and standard deviation equal to 1/√ (n–1). Codes of diversity indices are given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0066753#pone-0066753-t001" target="_blank">Table 1</a>.