Abstract:
:The mega-diversity of herbivorous insects is attributed to their co-evolutionary associations with plants. Despite abundant studies on insect-plant interactions, we do not know whether host-plant shifts have impacted both genomic adaptation and species diversification over geological times. We show that the antagonistic insect-plant interaction between swallowtail butterflies and the highly toxic birthworts began 55 million years ago in Beringia, followed by several major ancient host-plant shifts. This evolutionary framework provides a valuable opportunity for repeated tests of genomic signatures of macroevolutionary changes and estimation of diversification rates across their phylogeny. We find that host-plant shifts in butterflies are associated with both genome-wide adaptive molecular evolution (more genes under positive selection) and repeated bursts of speciation rates, contributing to an increase in global diversification through time. Our study links ecological changes, genome-wide adaptations and macroevolutionary consequences, lending support to the importance of ecological interactions as evolutionary drivers over long time periods.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Allio R,Nabholz B,Wanke S,Chomicki G,Pérez-Escobar OA,Cotton AM,Clamens AL,Kergoat GJ,Sperling FAH,Condamine FLdoi
10.1038/s41467-020-20507-3subject
Has Abstractpub_date
2021-01-13 00:00:00pages
354issue
1issn
2041-1723pii
10.1038/s41467-020-20507-3journal_volume
12pub_type
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