Cryptogam Recolonization after Wildfire: Leaders and Laggards in Assemblages?

Fire Ecology

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).

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