Abstract
Zaprionus indianus (Diptera: Drosophilidae) is an African species that was introduced in Brazil near the end of the 1990’s decade. To evaluate the adaptive potential of morphological traits in natural populations of this recently introduced species, we have investigated wing size and shape variation at Rio de Janeiro populations only two years after the first record of Z. indianus in Brazil. Significant genetic differences among populations from three distinct ecological habitats were detected. The heritability and evolvability estimates show that, even with the population bottleneck that should have occurred during the invasion event, an appreciable amount of additive genetic variation for wing size and shape was retained. Our results also indicated a greater influence of environmental variation on wing size than on wing shape. The importance of quantitative genetic variability and plasticity in the successful establishment and dispersal of Z. indianus in the Brazilian territory is then discussed.
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Abbreviations
- a :
-
large radius of the ellipse
- ANOVA:
-
Analysis on Variance
- ARF:
-
Atlantic rain forest area – Floresta da Tijuca
- b :
-
small axe of the ellipse
- covOP :
-
offspring – parent covariance
- CVA :
-
coefficient of additive genetic variance
- df:
-
degrees of freedom
- G1:
-
first generation of individuals raised in the laboratory; offspring of wild-caught females
- G2:
-
second generation of individuals raised in the laboratory
- h 2 :
-
narrow sense heritability
- I A :
-
evolvability measured as the ratio between additive genetic variance and the square of the mean value of the trait – VA2
- MS:
-
mean square
- Ns:
-
nonsignificant
- p :
-
probability
- PC1:
-
first principal component
- PC2:
-
second principal component
- PCA:
-
principal component analysis
- PCAL :
-
principal component analysis based on all first generation laboratory-reared individuals of the three collection sites
- PCAN :
-
principal component analysis based on all wild-caught individuals of the three collection sites
- PCAOP-L :
-
principal component analysis based on all individuals used for laboratory heritability estimates – G1 parents and G2 offspring
- PCAOP-N :
-
principal component analysis based on all individuals used for cross-environment heritability estimates – wild-caught females and G1 offspring of the HIE sample
- r :
-
correlation coefficient
- r A :
-
genetic correlation coefficient
- RES:
-
Restinga – open shrub vegetation area
- SH:
-
wing shape defined as b/a
- HIE:
-
human impact environment
- SI:
-
wing size defined as √(b*a)
- V A :
-
additive genetic variance
- V P :
-
phenotypic variance
- :
-
trait mean
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Loh, R., Bitner-Mathé, B.C. Variability of Wing Size and Shape in Three Populations of a Recent Brazilian Invader, Zaprionus indianus (Diptera: Drosophilidae), from Different Habitats. Genetica 125, 271–281 (2005). https://doi.org/10.1007/s10709-005-0367-1
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DOI: https://doi.org/10.1007/s10709-005-0367-1