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Table 1 Mean (standard deviation) of forest age and structure metrics within forest types (NON-NESTING, EDGE, INTERIOR) of potential nesting forests for northern spotted owls by fire regime [high severity, infrequent (HIGH); mixed severity, frequent (MIXED); low severity, very frequent (LOW)]

From: Northern spotted owl nesting forests as fire refugia: a 30-year synthesis of large wildfires

Stand structure metrics NON-NESTING EDGE INTERIOR
HIGH MIXED LOW HIGH MIXED LOW HIGH MIXED LOW
Stand agea 59 (54) 63 (41) 81 (34) 155 (86) 125 (68) 122 (46) 212 (83) 184 (77) 153 (48)
Canopy coverb 59 (28) 47 (26) 36 (22) 80 (14) 68 (17) 60 (15) 85 (9) 74 (13) 63 (12)
Live conifer d.b.h.c 33 (21) 36 (21) 39 (18) 61 (24) 60 (24) 59 (20) 71 (22) 72 (22) 72 (20)
Diameter diversityd 3 (2) 3 (2) 4 (2) 6 (2) 6 (1) 6 (1) 7 (1) 7 (1) 7 (1)
Stand heighte 18 (10) 17 (9) 14 (6) 31 (10) 27 (10) 22 (7) 35 (8) 34 (9) 27 (7)
Large conifer densityf 4 (10) 4 (8) 4 (7) 22 (19) 18 (16) 15 (12) 31 (18) 30 (18) 24 (14)
  1. aAverage stand age based on field-recorded ages of live dominant and codominant trees
  2. bPercent canopy cover of live conifer trees
  3. cDiameter (cm) at breast height of live conifer trees
  4. dIndex of structural diversity based on live conifer tree densities in different diameter classes (Davis et al. 2016)
  5. eAverage height (m) of live dominant and codominant trees
  6. fDensity (trees/ha) of large (> 75 cm d.b.h.) live conifer trees