Habitat characteristics associated with abundance of band-tailed pigeons and use of mineral sites in the Pacific Northwest Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sj1394055

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Index counts for the Pacific Coast race of the band-tailed pigeon (Columba fasciata monilis) have declined by -2% per year since survey efforts began in the 1950's and 60's. Mineral sites, important resources with high ion concentrations, are regularly visited by band-tailed pigeons which nest in surrounding forest lands. I used both ad hoc measurements of mineral site characteristics and composition and configuration of habitat types adjacent to mineral sites to develop models predicting band-tailed pigeon abundance at mineral sites, in the Pacific Northwest. Band-tailed pigeons were counted weekly during the summers of 2001 and 2002 at 20 mineral sites. Since, many mineral sites have been abandoned by band-tailed pigeons, I tested for an association between land use types mineral site use by band-tailed pigeons using a database of 69 currently used and 20 historically used mineral sites in Oregon. Lastly, I investigated the association between the timing and duration of precipitation on index counts of band-tailed pigeons at 20 mineral sites. Abundance of band-tailed pigeons was positively associated with habitat dominance, (i.e. 1-Shannon's Evenness or homogeneity of landcover types) at a scale larger than band-tailed pigeon home range size and with distance to the nearest adjacent mineral site. Both a quadratic effect of latitude and use of an indicator variable for regional variation in abundance were also present in top ranked models. Both latitudinal effects predicted an increase in birds from central Oregon to southern Washington, then a decrease from central Washington to British Columbia. My findings suggest that: 1) large areas of homogeneous landcover are important for band-tailed pigeons, 2) distribution of mineral sites is associated with the abundance of band-tailed pigeons, and 3) relative density of band-tailed pigeons in the Pacific Northwest exhibits a latitudinal gradient with more birds counted near the middle of their breeding range. Use of mineral sites in Oregon by band-tailed pigeons was associated with both the amount of forest cover (or lack thereof), and the amount of land under either private ownership or under special management to preserve biodiversity. Higher probability of mineral site use was predicted with increasing forest cover and special status land, lower probability of use was predicted with increasing non-forested landcover and private land. Four hot springs in Oregon were known to have once been used by band-tailed pigeons by no longer are, no hot springs are known to be currently used by band-tailed.
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
  • Master files scanned at 600 ppi (256 Grayscale, 24-bit Color) using Capture Perfect 3.0 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale, 24-bit Color), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by Anna Opoien (aoscanner@gmail.com) on 2008-07-02T21:53:09Z No. of bitstreams: 1 Overton_Cory_T_2003.pdf: 1173514 bytes, checksum: 25f8330cf2c4347dfe7f277e13e9e077 (MD5)
  • description.provenance : Made available in DSpace on 2008-07-15T13:17:09Z (GMT). No. of bitstreams: 1 Overton_Cory_T_2003.pdf: 1173514 bytes, checksum: 25f8330cf2c4347dfe7f277e13e9e077 (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-15T13:15:59Z (GMT) No. of bitstreams: 1 Overton_Cory_T_2003.pdf: 1173514 bytes, checksum: 25f8330cf2c4347dfe7f277e13e9e077 (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2008-07-15T13:17:08Z (GMT) No. of bitstreams: 1 Overton_Cory_T_2003.pdf: 1173514 bytes, checksum: 25f8330cf2c4347dfe7f277e13e9e077 (MD5)

Relationships

In Administrative Set:
Last modified: 08/02/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items