Genomic evidence that resource-based trade-offs limit host-range expansion in a seed beetle

Evolution; International Journal of Organic Evolution
Zachariah Gompert, Frank J Messina

Abstract

Trade-offs have often been invoked to explain the evolution of ecological specialization. Phytophagous insects have been especially well studied, but there has been little evidence that resource-based trade-offs contribute to the evolution of host specialization in this group. Here, we combine experimental evolution and partial genome resequencing of replicate seed beetle selection lines to test the trade-off hypothesis and measure the repeatability of evolution. Bayesian estimates of selection coefficients suggest that rapid adaptation to a poor host (lentil) was mediated by standing genetic variation at multiple genetic loci and involved many of the same variants in replicate lines. Sublines that were then switched back to the ancestral host (mung bean) showed a more gradual and variable (less repeatable) loss of adaptation to lentil. We were able to obtain estimates of variance effective population sizes from genome-wide differences in allele frequencies within and between lines. These estimates were relatively large, which suggests that the contribution of genetic drift to the loss of adaptation following reversion was small. Instead, we find that some alleles that were favored on lentil were selected against during reversi...Continue Reading

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Citations

Oct 28, 2016·Molecular Ecology·Zachariah GompertPatrik Nosil
Feb 22, 2017·Annals of the New York Academy of Sciences·Kim L Vertacnik, Catherine R Linnen
Apr 5, 2018·Molecular Ecology·Samridhi ChaturvediZachariah Gompert
Aug 11, 2018·Evolution; International Journal of Organic Evolution·Mrudula SaneDeepa Agashe
May 14, 2019·Journal of Economic Entomology·Frank J MessinaZachariah Gompert
Jan 1, 2020·Evolution; International Journal of Organic Evolution·Micah G FreedmanSharon Y Strauss
Apr 10, 2019·Molecular Ecology·Alexandre RêgoZachariah Gompert
Nov 29, 2020·Science Advances·M L ForisterZ Gompert
Dec 2, 2020·Nature Ecology & Evolution·Isabel S MagalhaesAndrew D C MacColl
Apr 3, 2020·Current Opinion in Insect Science·Heinz Müller-SchärerYan Sun
Jun 13, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Frank J MessinaZachariah Gompert

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