Recombination rate variation shapes barriers to introgression across butterfly genomes
Fig 3
Species relationships vary consistently both among and within chromosomes.
(A) Weightings for the ‘species’ (T3; blue) and ‘geography’ (T6; yellow) topologies plotted across the 21 chromosomes and smoothed as a locally weighted average (loess span = 1 Mb). See S3 Fig for a detailed plot without smoothing. Note that in the insert, the indicated direction of introgression in T6, from cyd into mel-W and from mel-E into tim, reflects our inferred predominant direction, even though introgression is thought to be bidirectional. (B) The average weighting for the same two topologies (colours as in panel A) for each of the 20 autosomes, plotted against the physical length of the chromosome. (C) Average weightings for the same two topologies (colours as in panels A and B) binned according to their relative chromosome position, from the centre (0) to the periphery (1). Each bin represents 5% of the chromosome arm, with the range indicated by a horizontal line. Vertical lines indicate ±1 SE. All plotted data deposited in the Dryad repository [55]. cyd, H. cydno; mel, H. melpomene; mel-E, eastern races of mel; mel-W, western races of mel; tim, H. timareta.
doi: https://doi.org/10.1371/journal.pbio.2006288.g003