Investigating Demographic and Evolutionary Factors Important for Fish Reintroduction Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wd375z493

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Reintroduction programs are used to re-establish species back into their historical habitat. Most reintroduction programs have failed and few papers have evaluated factors that may be important to Pacific salmon. The 158 meter tall Cougar Dam has blocked Chinook salmon (Oncorhynchus tshawytscha) from accessing 40 kilometers of historical spawning and rearing habitat for over 50 years. Here, I evaluated a Chinook salmon trap and transport reintroduction program above Cougar Dam on the South Fork McKenzie River, Oregon from 2007 to 2015. First, I evaluated if release location and date correlated with two measures of fitness based on adult assignments to age-0 juveniles collected above the dam and adult offspring returning to the South Fork McKenzie River, respectively. I found that release location and date had little to no effect on either measure of fitness. I also evaluated if there were fitness differences between hatchery and natural origin (HOR and NOR, respectively) adults. I found consistent fitness differences between males (RRS=0.48, p<0.001), but not females (RRS=0.72, p=0.81). In addition, I found that origin (p=0.352) no longer explained variation in fitness after accounting for variation in fork-length, which suggests that HOR fish may be less fit, in part, because they are 2-4 cm (95% CI) smaller, or perhaps younger. I also evaluated a measure of population productivity known as cohort replacement rate (CRR) - defined as the number of future spawners produced by a spawner. Based on genetic parentage assignments to NOR adults returning to the trap and transport facility, hereafter Cougar Trap, I found that adults reintroduced in 2007 and 2008 did not meet demographic replacement (CRR: 0.40 and 0.31, respectively). I also found a seasonal decline in the proportion of NOR adults produced above the dam that returned to the Cougar Trap. I also developed grandparentage assignment methods to determine how many precocial males and adfluvial Chinook salmon, two non-anadromous life history tactics, contributed to population productivity. I found 31 unsampled precocial males, as well as 48 age-4 and -5 probable adfluvial male and female adults contributed to the reintroduced population. My discovery of adfluvial Chinook salmon contributing to population productivity is significant because little is known about this life history tactic, and they provide resiliency to a reintroduced population. I show that adfluvial adults can be produced by anadromous mate pairs. Adfluvial adults increased CRR estimates; however, neither the 2007 or 2008 cohorts met replacement after incorporating this non-anadromous life history tactic (CRR: 0.46 and 0.35, respectively). Finally, I assessed if genetic variation in founding cohorts was maintained in their returning adult offspring returning to the South Fork McKenzie River, hereafter F₁ offspring. On average, 6 alleles were lost per locus between founding cohorts and their F₁ offspring. N[subscript e] estimates were high using either demographic or genetic methods (range: 344 to 893). My dissertation research provides valuable information on factors that may be important to population productivity, as well as the maintenance of genetic variation in nascent populations established through reintroduction.
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
Keyword
Subject
Rights Statement
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2016-05-19T23:09:52Z (GMT) No. of bitstreams: 2 SardNicholas2016.pdf: 3061414 bytes, checksum: bd442c69f19232c812616bcdfecc3a9d (MD5) license_rdf: 1379 bytes, checksum: da3654ba11642cda39be2b66af335aae (MD5)
  • description.provenance : Made available in DSpace on 2016-05-19T23:09:52Z (GMT). No. of bitstreams: 2 SardNicholas2016.pdf: 3061414 bytes, checksum: bd442c69f19232c812616bcdfecc3a9d (MD5) license_rdf: 1379 bytes, checksum: da3654ba11642cda39be2b66af335aae (MD5) Previous issue date: 2016-04-06
  • description.provenance : Submitted by Nicholas Sard (nicholas.sard@oregonstate.edu) on 2016-05-17T21:08:00Z No. of bitstreams: 2 license_rdf: 1379 bytes, checksum: da3654ba11642cda39be2b66af335aae (MD5) SardNicholas2016.pdf: 3056689 bytes, checksum: 81035110de898d197b1c6255e1352af4 (MD5)
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting to remove the signatures from the Abstract and Approval pages for security reasons. Everything else looks good. Once revised, log back into ScholarsArchive and go to the upload page. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2016-05-19T18:38:26Z (GMT)
  • description.provenance : Submitted by Nicholas Sard (nicholas.sard@oregonstate.edu) on 2016-05-19T18:52:00Z No. of bitstreams: 2 SardNicholas2016.pdf: 3061414 bytes, checksum: bd442c69f19232c812616bcdfecc3a9d (MD5) license_rdf: 1379 bytes, checksum: da3654ba11642cda39be2b66af335aae (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2016-05-19T19:09:02Z (GMT) No. of bitstreams: 2 SardNicholas2016.pdf: 3061414 bytes, checksum: bd442c69f19232c812616bcdfecc3a9d (MD5) license_rdf: 1379 bytes, checksum: da3654ba11642cda39be2b66af335aae (MD5)

Relationships

In Administrative Set:
Last modified: 08/04/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items