The abundance and distribution of harbor seals and steller sea lions in Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/fx719q266

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The abundance and distribution of the Pacific harbor seal (Phoca vitulina richardi) and the northern or Stellar sea lion (Eumetopias jubata) in Oregon are described, The number of seals and sea lions presented for bounty in Oregon since 1925 is presented. Based on periodic surveys conducted between December, 1967 and June, 1968, numbers of harbor seals in Oregon were estimated to be not more than 500 in 1967-68 and most were found outside estuaries on offshore islands. However, a population of harbor seals in excess of 2,000 was once found in Oregon. Simpson Reef, Hunter's Island, Rogue River Reef, and Gull Rock were locations of the major concentrations of harbor seals in Oregon. The Columbia River, once attested to have the greatest number of seals in Oregon, now has no year-around resident seals, and the number of seals entering the river or remaining in the river for extended periods appears to be at an all-time low. Numbers of northern sea lions in Oregon were estimated to be about 1, 000 in 1967-68. There were two breeding colonies or rookeries in Oregon, the largest on Orford Reef 3nd the smaller at Sea Lion Caves. Other locations used by sea lions included the Rogue River Reef, Simpson Reef, Three Arch Rock, and Tillamook Head. Since Kenyon and Scheffer (1953) previously estimated the sea lion population of Oregon to be 1,000 animals in 1953, it was concluded that the population in Oregon was relatively stable. However, the current population was considerably smaller than 1925-27.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
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 Deborah Campbell(deborah.campbell@oregonstate.edu) on 2011-08-03T20:55:48Z (GMT) No. of bitstreams: 1 PearsonJohnPhilip1969.pdf: 243665 bytes, checksum: d0a3c898fdc1eafc76084d39b0846c6d (MD5)
  • description.provenance : Submitted by Eric Vanderwall (ewscanner@gmail.com) on 2011-08-02T19:01:44Z No. of bitstreams: 1 PearsonJohnPhilip1969.pdf: 243665 bytes, checksum: d0a3c898fdc1eafc76084d39b0846c6d (MD5)
  • description.provenance : Made available in DSpace on 2011-08-03T21:00:11Z (GMT). No. of bitstreams: 1 PearsonJohnPhilip1969.pdf: 243665 bytes, checksum: d0a3c898fdc1eafc76084d39b0846c6d (MD5) Previous issue date: 1968-08-30
  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2011-08-03T21:00:11Z (GMT) No. of bitstreams: 1 PearsonJohnPhilip1969.pdf: 243665 bytes, checksum: d0a3c898fdc1eafc76084d39b0846c6d (MD5)

Relationships

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

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items