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Table 4 Comparison of means of residuals from the 1:1 prediction for species colonizing substrates on Surprise block 7.5 yr after wildfire and species not colonizing those substrates. Probability (P(1 tail)) of Welch’s t statistic (t stat) generated assuming unequal variances and using the listed degrees of freedom (df). Ability to colonize a substrate is assumed to enhance colonization so 1 tail probability is used. Where P(1-tail) ≤ 0.05, mean residual for colonists is ≥ mean residual for non-colonists; ns = no significant difference between mean of residuals for colonists and non-colonists. Note that species included are only those for which substrate preferences are known (61 species).

From: Cryptogam Recolonization after Wildfire: Leaders and Laggards in Assemblages?

Substrate Mean of residual frequency of grids for non-colonists Non-colonists (n) Mean of residual for colonists Colonists (n) df t stat P (1 tail)
Caldyanup −0.215 28 0.26 33 49 −1.94 0.03
Collis or Lindesay −0.130 10 0.07 51 41 −1.03 ns
Wood −0.178 28 0.22 33 49 −1.52 ns
Bark −0.034 34 0.13 27 58 −0.64 ns
Organic material not wood or bark −0.167 31 0.25 30 56 −1.65 0.05
Soil −0.033 37 0.15 24 49 −0.69 ns
Stone −0.127 42 0.41 19 30 −1.82 0.04
Charcoal −0.010 35 0.11 26 54 −0.44 ns