Altitudinal and seasonal variation in microsatellite allele frequencies of Drosophila buzzatii

Variation in climate, particularly temperature, is known to affect the genetic composition of populations. Although there have been many studies of latitudinal variation, comparisons of populations across altitudes or seasons, particularly for animal species, are less common. Here, we study genetic...

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Bibliographic Details
Published inJournal of evolutionary biology Vol. 24; no. 2; pp. 430 - 439
Main Authors BARKER, J.S.F, FRYDENBERG, J, SARUP, P, LOESCHCKE, V
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Publishing Ltd 01.02.2011
Subjects
Alleles
Altitude
altitudinal adaptation
Animals
chromosomal inversions
climatic selection
clinal variation
Demography
DNA
Drosophila - classification
Drosophila - genetics
Evolutionary biology
Genetics
genotype–environment associations
Insects
Microsatellite Repeats - genetics
Polymorphism, Genetic
Seasons
Temperature
thermal selection
Australia
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Summary:Variation in climate, particularly temperature, is known to affect the genetic composition of populations. Although there have been many studies of latitudinal variation, comparisons of populations across altitudes or seasons, particularly for animal species, are less common. Here, we study genetic variation (microsatellite markers) in populations of Drosophila buzzatii collected along altitudinal gradients and in different seasons. We found no differences in genetic variation between 2 years or between seasons within years. However, there were numerous cases of significant associations between allele frequencies or expected heterozygosities and altitude, with more than half showing nonlinear relationships. While these associations indicate possible selection and local altitudinal adaptation, direct tests gave strong evidence for selection affecting two loci and weaker evidence for five other loci. Two loci that are located within an inversion (including the one with strongest evidence for selection) show a linear increase in genetic diversity with altitude, likely due to thermal selection. Parallel associations with altitude here and with latitude in Australian populations indicate that selection is operating on chromosomal regions marked by some of the loci.
Bibliography:http://dx.doi.org/10.1111/j.1420-9101.2010.02180.x
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ISSN:1010-061X
1420-9101
DOI:10.1111/j.1420-9101.2010.02180.x