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  • 1
    Electronic Resource
    Electronic Resource
    Genetic and phenotypic correlations among size-related traits, and heritability variation between body parts in Drosophila buzzatii (1997)
    Springer
    Genetica 101 (1997), S. 131-139 
    Details
    ISSN: 1573-6857
    Keywords: Drosophila buzzatii ; environmental variability ; genetic and phenotypic correlations ; heritability ; size-related traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018360804439
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  • 2
    Electronic Resource
    Electronic Resource
    The evolutionary history of Drosophila buzzatii XXVII (1993)
    Springer
    Genetica 92 (1993), S. 61-65 
    Details
    ISSN: 1573-6857
    Keywords: thorax length ; Drosophila buzzatii ; life history traits ; longevity ; natural selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The correlation between body size and longevity was tested in an Argentinian natural population of Drosophila buzzatii. Mean thorax length of flies newly emerging from rotting cladodes of Opuntia vulgaris was significantly smaller than that of two samples of flies caught at baits. The present results which might be interpreted as directional selection for longevity favoring larger flies are in agreement with previous results achieved in a Spanish natural population of D. buzzatii. Flies emerging from different substrates showed significant differences in thorax length, suggesting that an important fraction of phenotypic variance can be attributed to environmental variability. However, laboratory and field work in different populations of D. buzzatii showed a significant genetic component for thorax length variation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057508
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  • 3
    Electronic Resource
    Electronic Resource
    An adaptive chromosomal polymorphism affecting size-related traits, and longevity selection in a natural population ofDrosophila buzzatii (1995)
    Springer
    Genetica 96 (1995), S. 285-291 
    Details
    ISSN: 1573-6857
    Keywords: inversion polymorphism ; Drosophila buzzatii ; longevity selection ; size/shape-related variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Size-related phenotypic variation among second-chromosome karyotypes inDrosophila buzzatii was examined in an Argentinian natural population. For all measured traits (thorax and wing length; wing, head and face width), this inversion polymorphism exhibited a significant and (additive) linear contribution to the phenotypic variance in newly emerged wild flies. The results suggest that only overall body size, and not body shape, is affected. as no karyotypic variation was found for any trait when the effects of differences in within-karyotype size were removed with Burnaby's method. Likewise, in an experiment of longevity selection in the wild, variation in chromosomal frequencies was verified in the direction predicted on the basis of: (i) previous studies on longevity selection for body size in the wild and (ii) the pattern of chromosomal effects we observed on size. The direction of such selection is consistent with a pattern of antagonistic selection detected in previous studies on the inversion polymorphism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439582
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