Breeding and foraging ecology of Caspian terns (Sterna caspia) in the mid-Columbia River : predation on juvenile salmonids and management implications Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cz30pw05t

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • I investigated Caspian terns (Sterna caspia) breeding at colonies on the Columbia Plateau (southeastern Washington and northeastern Oregon), with emphasis on the breeding and foraging ecology of Caspian terns nesting at colonies in the mid-Columbia River. I focused research at colonies where Caspian terns foraged on juvenile salmonids (Oncorhynchus spp.) because of potential impacts to stocks listed under the U.S. Endangered Species Act. Caspian tern colony size on the Columbia Plateau ranged from tens of breeding pairs to nearly 700 pairs at Crescent Island in the mid-Columbia River; total population size in the study area was about 1,000 pairs and appeared to be stable. The size and number of Caspian tern colonies in the Columbia Plateau region are likely constrained by the availability of suitable nesting habitat near abundant prey, a resource that appears limited within the study area. Productivity of Caspian terns was not affected by nest density at Crescent Island, information that may be helpful for resource managers deciding minimum area requirements for breeding Caspian terns at managed colony sites. At colonies on the mid- Columbia River, the majority of Caspian tern prey items consisted of juvenile salmonids. I estimated that Caspian terns nesting at Crescent Island in the mid- Columbia River consumed 382,000-547,000 and 533,000-825,000 juvenile salmonids during the breeding season in 2000 and 2001, respectively. Total salmonid predation by Crescent Island Caspian terns was less than that reported for some other predators in the Columbia River that have been managed to reduce predation rates on juvenile salmonids. The results of this research will be used by state, federal, and tribal resource managers to decide whether Caspian tern management is warranted at Crescent Island.
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, 256 Grayscale) 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 2011-02-17T21:42:38Z (GMT) No. of bitstreams: 1 AntolosMichelle2003.pdf: 3171931 bytes, checksum: df35256abffeec2810aa98978e1d39a8 (MD5)
  • description.provenance : Made available in DSpace on 2011-02-17T21:45:16Z (GMT). No. of bitstreams: 1 AntolosMichelle2003.pdf: 3171931 bytes, checksum: df35256abffeec2810aa98978e1d39a8 (MD5) Previous issue date: 2002-10-16
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-02-17T21:45:16Z (GMT) No. of bitstreams: 1 AntolosMichelle2003.pdf: 3171931 bytes, checksum: df35256abffeec2810aa98978e1d39a8 (MD5)
  • description.provenance : Submitted by Erin Clark (ecscannerosu@gmail.com) on 2011-02-17T20:00:07Z No. of bitstreams: 1 AntolosMichelle2003.pdf: 3171931 bytes, checksum: df35256abffeec2810aa98978e1d39a8 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items