Genetic and phenotypic correlations among size-related traits, and heritability variation between body parts in Drosophila buzzatii |
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Authors: | Fabian M Norry Juan C Vilardi Esteban Hasson |
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Institution: | (1) Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina |
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Abstract: | Recent studies have shown that body size is a heritable trait phenotypically correlated with several fitness components in
wild populations of the cactophilic fly Drosophila buzzatii. To obtain further information on size-related variation, heritabilities
as well as genetic and phenotypic correlations among size-related traits of several body parts (head, thorax and wings) were
estimated. The study was carried out on an Argentinean natural population in which size-related selection was previously detected.
The genetic parameters were estimated using offspring-parent regressions (105 families) in the laboratory G2 generation of a sample of wild flies. The traits were also scored in Wild-Caught Flies (WCF). Laboratory-Reared Flies (LRF)
were larger and less variable than WCF. Although heritability estimates were significant for all traits, heritabilities were
higher for thorax-wing traits than for head traits. Phenotypic and genetic correlations were all positive. The highest genetic
correlations were found between traits which are both functionally and developmentally related. Genetic and phenotypic correlations
estimated in the lab show similar correlation patterns (r = 0.49; TP = 0.02, Mantel's test). However, phenotypic correlations
were found to be typically larger in WCF than in LRF. The genetic correlation matrix estimated in the relatively homogeneous
lab environment is not simply a constant multiplicative factor of the phenotypic correlation matrix estimated in WCF.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Drosophila buzzatii environmental variability genetic and phenotypic correlations heritability size-related traits |
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