Genetica

, Volume 125, Issue 2, pp 271–281

Variability of Wing Size and Shape in Three Populations of a Recent Brazilian Invader, Zaprionus indianus (Diptera: Drosophilidae), from Different Habitats

Authors

  • Roberta Loh
    • Departamento de Genética, Instituto de BiologiaUniversidade Federal do Rio de Janeiro
    • Departamento de Genética, Instituto de BiologiaUniversidade Federal do Rio de Janeiro
Article

DOI: 10.1007/s10709-005-0367-1

Cite this article as:
Loh, R. & Bitner-Mathé, B.C. Genetica (2005) 125: 271. doi:10.1007/s10709-005-0367-1

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.

Keywords

adaptationbioinvasionevolvabilitygenetic variabilitymorphological variabilityZaprionusindianus

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

h2

narrow sense heritability

IA

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

rA

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)

VA

additive genetic variance

VP

phenotypic variance

 

trait mean

Copyright information

© Springer 2005