ArticleBMC evolutionary biology2014
Morphological differentiation despite gene flow in an endangered grasshopper.
Article in BMC evolutionary biology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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Who cites it
7 citing papers in PubMed.
- Pleistocene Climate Changes and Lineage Diversification ofEcology and evolution · 2025Article
- Unravelling the Molecular Identity of Bulgarian Jumping Plant Lice of the Family Aphalaridae (Hemiptera: Psylloidea).Insects · 2024Article
- Insights into Aotearoa New Zealand's biogeographic history provided by the study of natural hybrid zones.Journal of the Royal Society of New Zealand · 2024Review
- Standard metabolic rate variation among New Zealand Orthoptera.Current research in insect science · 2024Article
- Lack of assortative mating might explain reduced phenotypic differentiation where two grasshopper species meet.Journal of evolutionary biology · 2022Article
- Climate change and alpine-adapted insects: modelling environmental envelopes of a grasshopper radiation.Royal Society open science · 2022Article
- Ongoing Speciation and Gene Flow between Taxonomically Challenging Trochulus Species Complex (Gastropoda: Hygromiidae).PloS one · 2017Article
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundGene 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.
resultsOf 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.
conclusionsBased 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.
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