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Table 1 Fire severity influence on plant life form group richness in south Puget Sound prairies, Washington, USA, in 2011 and 2012. We used Taxa Indicator Threshold ANalysis (TITAN) to assess the response of plant origin (N = native, E = exotic) and life form (A = annual, P = perennial, G = grass, F = forb, S = shrub) to fire severity. The fire severity index (FSI) columns display the median, fifth (5th), and ninety-fifth (95th) percentile FSI values taken from a frequency distribution of 500 bootstrap replicates. Thus, the range in FSI values corresponds to the magnitude of tolerance or intolerance of life form groups to increasing fire severity. Indicator values (IndVal), P values, purity, and reliability are also reported. Prairies are ordered by purity for each response direction and life form group.

From: Ignition Patterns Influence Fire Severity and Plant Communities in Pacific Northwest, USA, Prairies

Response Life form group FSI 5th FSI median FSI 95th IndVal P value Purity Reliability
Positive EAG 0.88 1.09 1.49 35.80 <0.01 0.86 0.77
NAF 1.01 1.17 1.57 56.53 0.06 0.76 0.64
EPS 0.88 1.09 1.53 39.91 0.16 0.60 0.36
Negative EPF 0.89 1.00 1.38 59.85 <0.01 1.00 0.99
EPG 0.93 1.01 1.40 61.41 <0.01 0.99 0.98
NPG 1.02 1.15 1.53 59.70 <0.01 0.98 0.97
NPS 0.68 0.95 1.02 36.03 <0.01 0.96 0.87
NPF 0.88 1.13 1.49 58.60 0.05 0.92 0.78
EAF 0.68 1.01 1.36 59.13 0.04 0.80 0.69