Nest-Site Selection and Nesting Success of Cavity-Nesting Birds in High Elevation Forest Drainages

摘要: ABssAcr.-We identified habitat features that characterized successful and unsuccessful nest sites, sites vs. random differences among coexisting species of cavitynesting birds for 356 nests in central Arizona. Live and, more commonly, dead quaking aspens (Populus tremuloides) were used 88% all but constituted only 12% trees plots (n = 152). Nest patches (11.3-m-radius circle centered on the tree) most bird contained significantly conifers, which provided foraging substrates cavity-nesting species, than plots, had fewer deciduous (except aspens). Thus, potential existed chosen plots. Failed generally concealed by foliage closer to conifers. success was lower with height. Reduced at may occur because predators are successful. Nonexcavator nesting excavator possibly they nested lower, greater concealment, older cavities, tended have smaller body mass. Received 21 May 1990, accepted 26 November 1990.