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DNA variation at the rp49 gene region in Drosophila madeirensis and D. subobscura from Madeira: inferences about the origin of an insular endemic species
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Authors
Advisor(s)
Abstract(s)
An 1.6-kb fragment spanning the rp49 gene was sequenced in 16 lines of
Drosophila subobscura from Madeira and in 22 lines of the endemic species
D. madeirensis. Nucleotide diversity in D. subobscura from Madeira (p 0.0081)
was similar to that in lines from Spain carrying the O3+4 chromosomal
arrangement (p 0.0080). No signi®cant genetic differentiation was detected
between insular and continental O3+4 lines of D. subobscura. These results are
compatible both with a rather recent and massive colonization, and with
multiple colonization events from the continent. Nucleotide diversity in
D. madeirensis (p 0.0076) was similar to that in D. subobscura, which deviates
from the expectation, under strict neutrality, of a lower level of variation in an
insular species with a small population size. The observed numbers of shared
polymorphisms and of ®xed differences between D. madeirensis and
D. subobscura are compatible with the isolation model of speciation, where
shared polymorphisms are due to common ancestry.
Description
Keywords
DNA polymorphism Drosophila madeirensis Drosophila subobscura rp49 gene Speciation . Faculdade de Ciências da Vida
Citation
Khadem, M., Rozas, J., Segarra, C., & Aguadé, M. (2001). DNA variation at the rp49 gene region in Drosophila madeirensis and D. subobscura from Madeira: inferences about the origin of an insular endemic species. Journal of Evolutionary Biology, 14(3), 379-387. https://doi.org/10.1046/j.1420-9101.2001.00293.x
Publisher
Wiley