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Table 1 Mean, standard error (SE), 95% confidence interval (CI) and range for 11 characteristics of 38 Slender-billed Parakeet (E. leptorhynchus) nesting cavities in southern beech (L. obliqua) trees in the central valley of southern Chile, 2008–2011

From: Lophozonia tree cavities used for nesting by Slender-billed Parakeets (Enicognathus leptorhynchus) in the central valley of southern Chile: a potentially vanishing keystone resource

Cavity feature Mean SE CI Range
Nest tree height (m) 30.4 1.1 28.8–32.5 5.0–43.5
Nest tree DBH (cm) 134.5 4.7 125.4–144.0 83.4–193.9
Nest tree agea (years) 336.3 12.3 312.2–360.4 209.0–485.0
Cavity heightb (m) 12.5 0.9 10.7–14.2 3.0–22.8
Entrance height (cm) 51.0 13.3 24.9–77.1 28.5–400.0
Entrance width (cm) 11.5 0.7 10.2–12.8 6.0–25.0
Cavity diameter Ac (cm) 36.5 2.6 31.8–41.9 12.0–73.0
Cavity diameter Bd (cm) 39.6 2.4 34.8–44.3 18.0–84.0
Cavity depth (cm) 90.3 24.2 42.9–138.5 5.0–500.0
Internal ellipsee (cm2) 1239.0 163.0 919.5–1558.5 170.0–4022.0
Cavity volumef (L) 93.7 24.6 45.5–141.9 2.9–549.5
  1. DBH diameter at breast height
  2. aBased on Echeverría and Lara (2004), Salas and García (2006), Salas et al. (2006)
  3. bAbove ground level
  4. cParallel to entrance axis (front-to-rear)
  5. dPerpendicular to entrance axis (left-to-right)
  6. eHorizontal area within cavity at entrance level
  7. fProduct of cavity depth and internal ellipse