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Table 3 The numbers of B. attenuata and B. menzeseii adult trees and cones per hectare, closed follicles per cone, and estimated grams of seed per hectare and carrying capacity for Carnaby’s cockatoo compared among banksia woodland sites located 30 to 50 km north of Perth, Western Australia, from 2017 through 2019. Sites were chosen from paired areas that had been treated with a prescribed burn, experienced a bushfire, or remained unburned. The mean and standard error (italicized number below the mean) are provided. Treatments not sharing the same letter are different for that year at α ≤ 0.05

From: Prescribed burning in a mediterranean-climate region mitigates the disturbance by bushfire to a critical food resource for an endangered bird, the Carnaby’s cockatoo

  Unburned Prescribed burn Bushfire
Year 2 Year 3 Year 2 Year 3 Year 2 Year 3
Live B. attenuata trees (trees ha–1) 138.7a, b 113.3a, b 171.4a 158.5a 102.1b 108.2b
26.8 24.5 22.4 18.0 17.1 15.2
Live B. menzeseii trees (trees ha–1) 73.3a 89.3a 101.3a 89.9a 33.5b 46.5b
15.1 15.9 13.9 11.1 7.9 10.8
Total live trees (trees ha–1) 212.0a, b 202.7a, b 272.8a 248.4a 135.6b 154.7b
34.2 30.7 28.2 22.0 21.2 23.1
Total dead trees (trees ha–1) 18.7a 13.3a 32.0a, b 18.4a, b 49.5b 38.9b
5.1 4.7 7.4 4.9 16.4 7.6
Survival (%) 90.7a 94.0a 89.2a 92.5a 66.7b 71.1b
2.5 2.1 2.7 1.8 7.0 6.7
B. attenuata cones (cones ha–1) 6122.7 5158.7 5697.5 5049.1 3995.4 4868.6
934.9 708.4 810.4 586.7 912.7 1188.3
B. menzeseii cones (cones ha–1) 1741.3a 2354.7a 1849.1a 1712.0a 554.7b 626.3b
452.7 817.9 339.9 315.2 248.5 255.1
B. attenuata closed follicles (follicles cone–1) 4.0a 3.8a 3.2a 4.1a 1.4b 2.1b
0.8 0.6 0.3 0.4 0.4 0.5
B. menzesii closed follicles (follicles cone–1) 2.1a 1.9a 1.4a 1.6a 0.2b 1.4a
0.8 0.7 0.3 0.4 0.1 0.6
B. attenuata seed (g ha–1) 2069.5a 1480.5a 1556.1a 1896.7a 384.7b 891.5b
515.5 281.9 307.0 327.5 124.4 390.1
B. menzesii seed (g ha–1) 194.4a 436.5a 245.2a 222.1a 12.1b 64.2b
68.5 239.8 78.3 64.7 9.0 31.2
Carnaby’s cockatoo (100 ha–1 yr–1) 14.1a 11.8a 11.1a 13.1a 2.5b 5.9b
3.1 2.2 2.0 2.1 0.8 2.5