Earthquakes trigger the loss of groundwater biodiversity.

post-earthquake differences in species abundance were highly significant ( Supplementary Table 3 ; pairwise tests after significant one-way PERMANOVA: 1997 vs. 2012: P = 0.0009; 2005 vs. 2012: P = 0.0015), while differences between the two pre-seismic samplings remained non-significant (1997 vs. 2005: P = 0.5131).

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Partly to counterbalance the possible slight liberalism of borderline significant Friedman and/or Nemenyi results, a Bonferroni correction was applied to all tests (whose original significance threshold was set at P < 0.05), leading to a Cochran-Friedman-Nemenyi experiment-wide significance threshold of P < 0.016.

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