Graduate Thesis Or Dissertation
 

A quantitative genetic analysis of fitness characters in Tribolium confusum

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

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  • 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.
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