A Survey of Ant Species in Three Habitats at Mount St. Helens National Volcanic Monument

Table 5

Mann-Whitney U tests comparing Shannon-Wiener Biodiversity Indices of ant communities between habitat types at Mount St. Helens National Volcanic Monument.

Habitat type* comparison	Mann-Whitney U test statistic	𝑃^∗∗
BDZ > PPLV	99	0.0014
BDZ > PPHV	36	0.0009
PPHV = PPLV	51	0.0754

*PPLV: Pumice Plain-Low Vegetation, PPHV: Pumice Plain-High Vegetation, BDZ: Blowdown Zone.
**With a Bonferroni correction, only P values < 0.017 were considered significant.