Evaluation of combining ability in mosquitofish Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v979v607x

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Two replications of a half dial lei cross experiment were performed among four inbred lines of mosquitofish, Gambusia affinis. These inbred lines originated from three random-bred stocks: OR, TX and CD. The experiment was conducted as a completely randomized design. Experimental material consisted of parental lines and F₁ populations maintained under identical environment. Information concerning fecundity, size of female and generation interval was obtained from F₁ populations. Estimates of gene action were determined by calculating heterosis and by analyzing for general and specific combining ability. In addition, phenotypic correlations among all the traits were determined. Significant differences among crosses were observed for generation interval (P<0.01) and for fecundity (P<0.05), while no significant differences were detected for body size in females. For fecundity, measurable positive heterotic effects and significant differences in specific combining ability indicated that the genes with non-additive effects played the main role in the expression of this trait. For size of female, heterotic effects were small and negative, and no significant differences in combining ability were observed. Thus, in the inheritance of this character the main role may be attributed to the additive components of variance. Due to the highly significant general combining ability effects and small heterosis values, the expression of generation interval is greatly influenced by additive genetic effects. Parental evaluation in terms of general and specific combining ability values was considered for all traits studied. Strain ORK was identified as a good combiner for all three traits except when crossed with the related line, ORJ, or when inbred. Crossbreds ORKxTXA and 0RKxCDC excelled over the other hybrids with respect to higher fecundity and shorter generation interval, but were of smaller size at the time of reproduction. Correlation coefficients indicated that the fecundity was highly associated with size of female but was not associated with generation interval. The relationship between body size and generation interval was also important. These findings would indicate that smaller and younger fish in this study had lower fecundities than larger and older fish.
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
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by Katy Davis (kdscannerosu@gmail.com) on 2013-07-31T21:40:46Z No. of bitstreams: 1 PongthanaNuanmanee1984.pdf: 282664 bytes, checksum: 8719b4f8ca8a32046a72419de8d145b8 (MD5)
  • description.provenance : Made available in DSpace on 2013-08-01T18:53:26Z (GMT). No. of bitstreams: 1 PongthanaNuanmanee1984.pdf: 282664 bytes, checksum: 8719b4f8ca8a32046a72419de8d145b8 (MD5) Previous issue date: 1983-08-10
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-01T18:53:26Z (GMT) No. of bitstreams: 1 PongthanaNuanmanee1984.pdf: 282664 bytes, checksum: 8719b4f8ca8a32046a72419de8d145b8 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-01T14:23:45Z (GMT) No. of bitstreams: 1 PongthanaNuanmanee1984.pdf: 282664 bytes, checksum: 8719b4f8ca8a32046a72419de8d145b8 (MD5)

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items