Habitat relationships of birds and young-growth Douglas-fir in northwestern California Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ns0647979

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Ninety-one species of birds were surveyed in grass/forb, early and late shrub/sapling, pole, and medium sawtimber stages of young-growth Douglas-fir in northwestern California; patterns of bird distribution and abundance were related to habitat conditions and even-age silvicultural treatments. Seven species (band-tailed pigeon, western wood pewee, dusky flycatcher, western bluebird, fox sparrow, purple finch, and evening grosbeak) have probably increased in population size or distribution since extensive clearcutting in the study area began in the early 1950's. Six species (Hammond's flycatcher, chestnut-backed chickadee, red-breasted nuthatch, brown creeper, golden-crowned kinglet, and hermit warbler) are restricted to forest stages and probably have decreased in population size or distribution. Abundances of various species were associated with presence of a forest overstory, hardwood stem density, deciduous foliage volume, height and patchiness of shrub cover, number plant species, and snag density. Slope angle and distance to permanent water or to the next nearest similar habitat type explained some variation in abundance of a few species. The grass/forb stage had the lowest number of bird species and lowest total density, while the late shrub/sapling stage had the highest; species composition varied markedly across the young-growth stages. Cluster analysis defined Shrub stage specialists and forest stage Specialists. Seasonal patterns of permanent resident species suggested that the shrub stage specialists are most limited in distribution during winter, and that their winter distributions may reflect optimal ("source") habitat. In contrast, forest stage specialists showed no seasonal changes of distribution, or were more restricted in distribution during the breeding season. All phases of the clearcutting system, including site preparation, stocking control, intermediate treatments, and final harvest, greatly affect stand conditions. No one stand condition, young-growth stage, or silvicultural treatment provided best habitat for all bird species. Simplification of forest stand structure by reduction or elimination of hardwoods, snags, and large diameter softwoods, could lead to low within-stand but high between-stand diversity of vegetation and bird assemblages. Even-age silvicultural systems, however, can integrate management objectives for timber production and bird habitat.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-08-18T16:22:04Z (GMT) No. of bitstreams: 1 MarcotBruceG1985.pdf: 2823609 bytes, checksum: 5c3caa3bfe2d957e67f04cf23085bfdc (MD5)
  • description.provenance : Approved for entry into archive by Digital Production(digitalproduc@gmail.com) on 2010-08-17T18:05:00Z (GMT) No. of bitstreams: 1 MarcotBruceG1985.pdf: 2823609 bytes, checksum: 5c3caa3bfe2d957e67f04cf23085bfdc (MD5)
  • description.provenance : Submitted by Eric Hepler (ehscanner@gmail.com) on 2010-08-17T00:23:48Z No. of bitstreams: 1 MarcotBruceG1985.pdf: 2823609 bytes, checksum: 5c3caa3bfe2d957e67f04cf23085bfdc (MD5)
  • description.provenance : Made available in DSpace on 2010-08-18T16:22:04Z (GMT). No. of bitstreams: 1 MarcotBruceG1985.pdf: 2823609 bytes, checksum: 5c3caa3bfe2d957e67f04cf23085bfdc (MD5)

Relationships

In Administrative Set:
Last modified: 08/01/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items