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Population expansion and genomic adaptation to agricultural environments of the soybean looper, Chrysodeixis includens
Author(s) -
Silva Cleane S.,
Cordeiro Erick M.G.,
Paiva Julia B.,
Dourado Patrick M.,
Carvalho Renato A.,
Head Graham,
Martinelli Samuel,
Correa Alberto S.
Publication year - 2020
Publication title -
evolutionary applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.776
H-Index - 68
ISSN - 1752-4571
DOI - 10.1111/eva.12966
Subject(s) - biology , local adaptation , adaptation (eye) , population , genetic diversity , evolutionary biology , host (biology) , ecology , demography , sociology , neuroscience
Evolutionary studies of insect pests improve our ability to anticipate problems in agricultural ecosystems, such as pest outbreaks, control failures, or expansions of the host range. Here, we investigated the mechanisms underlying the evolutionary processes behind the recent census size expansion and local adaptation of Chrysodeixis includens . First, we sequenced mitochondrial markers to conduct a phylogeographic investigation of C. includens historical processes. Then, we combined a de novo genotyping‐by‐sequencing approach with a study of agricultural landscapes to uncover recent processes of adaptation. Primarily, we found low genetic diversity across all markers and clear indications of a recent demographic expansion. We also found a lack of significant isolation by distance (IBD), and weak or absent genetic structure considering geographic locations. However, we did find initial signs of population differentiation that were associated with host plant types (i.e., soybean and cotton). Agricultural landscape attributes, including soybean crops, were significantly associated with putative markers under positive selection. Moreover, positive selection associated with host differentiation was putatively linked to digestive enzymes. This study showed how landscape composition and host plants can affect the evolutionary process of agricultural pest insects such as C. includens .

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