2006
DOI: 10.1038/sj.hdy.6800821
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Abstract: We address the controversy over the processes causing divergence during speciation. Host races of the fruit fly Tephritis conura attack the thistles Cirsium oleraceum and Cirsium heterophyllum. By studying the genetic divergence of T. conura in areas where host plants are sympatric, parapatric and allopatric, we assessed the contribution of geography in driving host-race divergence. We also evaluated the relative importance of genetic drift and selection in the diversification process, by analysis of the geogr… Show more

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Cited by 16 publications
(35 citation statements)
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“…The infestation pattern of C. palustre in Britain resembles the first phase in a geographic setting hypothesised in the evolution of host races infesting C. oleraceum and C. heterophyllum in continental Europe (see Diegisser et al 2006b), namely range expansion in sympatry (here from C. heterophyllum to C. palustre) in an area that is peripatric to the main distribution (C. heterophyllum is isolated in northern Britain), and with the possibility to spread on the novel host across a contiguous range. Such host-range expansions will often increase the geographic distribution of the infesting insect, and in the event of extinction and/or removal of the alternative host(s) it may be a first step in speciation (e.g.…”
Section: Discussionmentioning
confidence: 99%
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“…The infestation pattern of C. palustre in Britain resembles the first phase in a geographic setting hypothesised in the evolution of host races infesting C. oleraceum and C. heterophyllum in continental Europe (see Diegisser et al 2006b), namely range expansion in sympatry (here from C. heterophyllum to C. palustre) in an area that is peripatric to the main distribution (C. heterophyllum is isolated in northern Britain), and with the possibility to spread on the novel host across a contiguous range. Such host-range expansions will often increase the geographic distribution of the infesting insect, and in the event of extinction and/or removal of the alternative host(s) it may be a first step in speciation (e.g.…”
Section: Discussionmentioning
confidence: 99%
“…With the exception of population PEn2 (see above), 24 individuals (12 males and females) per site were included for allozyme analyses. Of the 13 enzyme systems analysed in a previous allozyme study of T. conura host races infesting C. heterophyllum and C. oleraceum (Diegisser et al 2006b Diegisser et al (2006b). An allele frequency table is included in the ''Appendix''.…”
Section: Allozyme Analysesmentioning
confidence: 99%
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