Sustaining Cavity-Using Species: Patterns of Cavity Use and Implications to Forest Management
Figure 7
Mean diameter (dbh) of nest trees or snags used by secondary cavity nesters as a function of bird length (bill to tail length) in conifers (◆) and hardwoods (○) of the Pacific Northwest. Linear regression relationships are shown by a solid line for conifers (nonsignificant) and dotted line for hardwoods (). Bird lengths from [234]. Data of [11, 55, 61, 94, 97, 98, 104, 107, 115, 116, 120, 122, 155, 253–257].