You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Heartwood Decay and Vertical Distribution of Red-Naped Sapsucker Nest Cavities
Gretchen C. Daily
The Wilson Bulletin
Vol. 105, No. 4 (Dec., 1993), pp. 674-679
Published by: Wilson Ornithological Society
Stable URL: http://www.jstor.org/stable/4163359
Page Count: 6
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
This paper describes a dynamic spatial pattern of Red-naped Sapsucker (Sphyrapicus nuchalis) cavity excavation in aspen groves and evaluates the possible importance of heartwood decay distribution, a prerequisite for nest excavation, in producing it. Sapsuckers typically situate the first cavity excavation in a tree relatively close to the ground and then make progressively higher excavations in subsequent years. Heartwood decay is reported to infect aspen via the roots or broken branch stubs, mostly at the base of the trees. Coring revealed that all nest trees were rotted at the base. The pattern of sapsucker cavity excavation can be explained as the outcome of an interaction between the distribution over height within trees of both heart rot and predation risk.
The Wilson Bulletin © 1993 Wilson Ornithological Society