The genomic architecture of a rapid island radiation: mapping chromosomal rearrangements and recombination rate variation in Laupala

摘要: Speciation depends on the (local) reduction of recombination between genomes partially isolated, diverging populations. Chromosomal rearrangements and generic molecular mechanisms in genome affect rate thereby constraining efficacy (linked) selection. This can have profound impacts trait divergence, particular complex phenotypes associated with speciation by sexual Because obligate co-evolution traits preferences communication signals, it may be expected that these co-adapted gene complexes reside regions low recombination, because increased potential for linked Here we test this hypothesis Laupala , a genus crickets distributed across Hawaiian archipelago underwent recent rapid speciation. We generate three dense linkage maps from interspecies crosses use information to anchor substantial portion de novo assembly chromosomes. Local rates were then estimated as function genetic physical distance anchored markers. These data provide important genomic resources Orthopteran model systems biology. In line expectations based species9 divergence successful interbreeding lab, are highly collinear show no evidence large scale chromosomal rearrangements. Contrary our expectations, region where male song QTL peak co-localizes female preference was not particularly rates. study shows trait-preference selection is necessarily constrained local