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Table 2 Categories of non-weather-related independent variables (rows) summarized by post-burn damage class for the Cladonia samples (columns). Values are counts followed by proportions in parentheses. Variables entered into the feature selection algorithm are indicated by an asterisk (*)

From: Factors influencing the persistence of reindeer lichens (Cladonia subgenus Cladina) within frequent-fire environments of the Mid-Atlantic Coastal Plain, USA

 Sample size (n)Post-burn condition of Cladonia
Intact (n)Fragments (n)Consumed (n)
Cover type (number of sites)
 Hardwood–pine regrowth (3)12167 (0.55)31 (0.26)23 (0.19)
 Pre-commercial pine (1)411 (0.02)19 (0.46)21 (0.51)
 Closed-canopy pine (1)300 (0.00)12 (0.40)18 (0.60)
 Open-canopy pine (2)364 (0.11)13 (0.36)19 (0.53)
Prior burns* (n)
 0461 (0.02)18 (0.39)27 (0.59)
 110546 (0.44)31 (0.30)28 (0.27)
 27725 (0.32)26 (0.34)26 (0.34)
Cladonia size class* (diameter)
 Small (<2.5 cm)4718 (0.38)9 (0.19)20 (0.43)
 Medium (2.5 to 10 cm)13843 (0.31)48 (0.35)47 (0.34)
 Large (>10 cm)4311 (0.26)18 (0.42)14 (0.33)
Cladonia position relative to forest floor*
 Above18969 (0.37)54 (0.29)66 (0.35)
 Within393 (0.08)21 (0.54)15 (0.38)
Litter incorporated within Cladonia*
 No10455 (0.53)22 (0.21)27 (0.26)
 Yes12417 (0.14)53 (0.43)54 (0.44)
Fuel type*
 Hardwood7739 (0.51)22 (0.29)16 (0.21)
 Hardwood>pine402 (0.05)17 (0.43)21 (0.53)
 Pine>hardwood593 (0.05)25 (0.42)31 (0.53)
 Pine251 (0.04)11 (0.44)13 (0.52)
 Bare soil2727 (1.00)0 (0.00)0 (0.00)
Fuel loading*
 Low2623 (0.88)1 (0.04)2 (0.08)
 Medium8034 (0.43)27 (0.34)19 (0.24)
 High12215 (0.12)47 (0.39)60 (0.49)
Fuel continuity*
 Low4442 (0.95)1 (0.02)1 (0.02)
 Medium8828 (0.32)34 (0.39)26 (0.30)
 High962 (0.02)40 (0.42)54 (0.56)
Substrate*
 Soil3626 (0.72)6 (0.17)4 (0.11)
 Moss6317 (0.27)28 (0.44)18 (0.29)
 Wood3211 (0.34)4 (0.13)17 (0.53)
 Litter9718 (0.19)37 (0.38)42 (0.43)