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Sexual isolation between Drosophila melanogaster females and Drosophila simulans males. I - Relation between homospecific and heterospecific mating success



Sexual isolation between Drosophila melanogaster females and Drosophila simulans males. I - Relation between homospecific and heterospecific mating success



Genetique Selection Evolution 19(1): 21-36



The mating performances of D. melanogaster females and D. simulans males have been examined in homospecific and heterospecific crosses. Isofemale lines of D. melanogaster and D. simulans selected according to their previous high, intermediate, and low hybridiation values in crosses between melanogaster females and simulans males were used. The dynamics of mating success as flies reached sexual maturity was examined. Female sexual maturity of the isofemale lines, estimated from mating frequency, gradually increased with ageing. Around 10 p. 100 of females were sexually mature in the first 24 hr and the maximum value was attained roughly at day 3. Important difference in the speed of sexual maturity were found between the D. melanogaster lines. In D. simulans, differences between lines were small. Hybridization was not restricted to young females, as adults also hybridized on day 4 of life. In this sense, females played a more important role than males. Notably, the hybridization success of D. melanogaster females was directly related with their speed in attaining sexual maturity. However, not relation was found in D. simulans males between their hybridization success and their mating behaviour with homospecific females. Sexual isolation and mating propensities are discussed in the light of current mating theories.

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Accession: 006408718

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PMID: 22879269

DOI: 10.1186/1297-9686-19-1-21


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