A quantitative genetic analysis of fitness characters in Tribolium confusum Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/sf2687839

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The objective of this study is to assess the quantitative genetic structure of fitness characters in Tribolium confusum flour beetles. Estimates of genetic variation and covariation for a series of fitness components (two measurements of survival, larval weight, development time, fecundity, and female productivity) were obtained from two populations of T. confusum (populations 1-1 and 1-2). Prior to sampling for the present experiment, the two populations had been maintained under identical, controlled culture conditions for over 10 years. An analysis of genotypic means indicates extensive genetic differentiation has occurred between the two populations for all characters except development time. Population 1-1 contains relatively large amounts of additive genetic variation for both measurements of survival, larval weight, fecundity, and female productivity. Many of the genetic variance component estimates from population 1-2 are negative. Both populations contain significant amounts of nonadditive variation for fecundity and female productivity. Population 1-1 also contains significant amounts of genetic covariation for several of the characters. Positive genetic covariation exists for the two measurements of survival, while the genetic correlation between survival and fecundity is large and negative. Many of the genetic correlation estimates from population 1-2 are undefined since the variance component estimates are negative. There appears to be a relationship between genetic variation and covariation for survival and fecundity in population 1-1. Significant amounts of genetic variation were detected for survival and fecundity in addition to a significant negative genetic correlation between these characters. This result is consistent with the theoretical expectation that antagonistic pleiotropy among fitness components can maintain genetic variation in the individual characters. This type of genetic structure is consistent with the shifting balance theory of evolution and could explain the substantial amount of genetic differentiation observed between the two populations. That is, strong negative genetic correlations among fitness components can not only maintain genetic variation in individual characters, but also generate a complex adaptive landscape where stochastic forces operating in conjunction with systematic forces can produce large population differences among the various traits.
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 Patricia Black(patricia.black@oregonstate.edu) on 2013-05-08T15:54:14Z (GMT) No. of bitstreams: 1 ZirkleDaveF1990.pdf: 719893 bytes, checksum: 5b727aa8fbd90b720a51672c0429cd93 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-29T18:21:46Z (GMT) No. of bitstreams: 1 ZirkleDaveF1990.pdf: 719893 bytes, checksum: 5b727aa8fbd90b720a51672c0429cd93 (MD5)
  • description.provenance : Made available in DSpace on 2013-07-29T18:21:46Z (GMT). No. of bitstreams: 1 ZirkleDaveF1990.pdf: 719893 bytes, checksum: 5b727aa8fbd90b720a51672c0429cd93 (MD5) Previous issue date: 1990-01-10
  • description.provenance : Submitted by Kim Stowell (ksscannerosu@gmail.com) on 2013-05-03T19:17:02Z No. of bitstreams: 1 ZirkleDaveF1990.pdf: 719893 bytes, checksum: 5b727aa8fbd90b720a51672c0429cd93 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items