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- W2022175883 abstract "Gene flow is traditionally considered a limitation to speciation because selection is required to counter the homogenising effect of allele exchange. Here we report on two sympatric short-horned grasshoppers species in the South Island of New Zealand; one (Sigaus australis) widespread and the other (Sigaus childi) a narrow endemic. Of the 79 putatively neutral markers (mtDNA, microsatellite loci, ITS sequences and RAD-seq SNPs) all but one marker we examined showed extensive allele sharing, and similar or identical allele frequencies in the two species where they co-occur. We found no genetic evidence of deviation from random mating in the region of sympatry. However, analysis of morphological and geometric traits revealed no evidence of morphological introgression. Based on phenotype the two species are clearly distinct, but their genotypes thus far reveal no divergence. The best explanation for this is that some loci associated with the distinguishing morphological characters are under strong selection, but exchange of neutral loci is occurring freely between the two species. Although it is easier to define species as requiring a barrier between them, a dynamic model that accommodates gene flow is a biologically more reasonable explanation for these grasshoppers." @default.
- W2022175883 created "2016-06-24" @default.
- W2022175883 creator A5046651038 @default.
- W2022175883 creator A5066012871 @default.
- W2022175883 creator A5089146735 @default.
- W2022175883 date "2014-10-16" @default.
- W2022175883 modified "2023-09-25" @default.
- W2022175883 title "Morphological differentiation despite gene flow in an endangered grasshopper" @default.
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- W2022175883 doi "https://doi.org/10.1186/s12862-014-0216-x" @default.
- W2022175883 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4219001" @default.
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