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Genomics and the origin of species
TLDR
Emergent trends and gaps in understanding are identified, new approaches to more fully integrate genomics into speciation research are proposed, and an integrative definition of the field of speciation genomics is provided.
Evaluating the Use of ABBA–BABA Statistics to Locate Introgressed Loci
TLDR
It is found that D is unreliable in this situation as it gives inflated values when effective population size is low, causing D outliers to cluster in genomic regions of reduced diversity, and a related statistic f^d is proposed, a modified version of a statistic originally developed to estimate the genome-wide fraction of admixture.
Reproductive isolation caused by colour pattern mimicry
TLDR
It is shown that a shift in colour pattern mimicry was crucial in the origin of two butterfly species, and individuals from a population of H. melpomene allopatric to H. cydno court and mate with the sister species more readily than those from a sympatric population, suggesting that assortative mating has been enhanced in sympatry.
Genome-wide evidence for speciation with gene flow in Heliconius butterflies.
TLDR
Overall these results show that species divergence can occur in the face of persistent and genome-wide admixture over long periods of time.
Butterfly genome reveals promiscuous exchange of mimicry adaptations among species
TLDR
It is inferred that closely related Heliconius species exchange protective colour-pattern genes promiscuously, implying that hybridization has an important role in adaptive radiation.
Speciation by hybridization in Heliconius butterflies
TLDR
It is shown that a hybrid trait in an animal species can directly cause reproductive isolation, and that the phenotype of H. heurippa reproductively isolates it from both parental species.
Linkage Mapping and Comparative Genomics Using Next-Generation RAD Sequencing of a Non-Model Organism
TLDR
This work constructed a RAD library using genomic DNA from a Plutella xylostella backcross that segregated for resistance to the insecticide spinosad, and used RAD sequencing to construct a genetic linkage map de novo for an organism that has no previous genome data.
Chromosomal rearrangements maintain a polymorphic supergene controlling butterfly mimicry
TLDR
The results indicate that allelic combinations at known wing-patterning loci have become locked together in a polymorphic rearrangement at the P locus, forming a supergene that acts as a simple switch between complex adaptive phenotypes found in sympatry.
Genomic islands of divergence in hybridizing Heliconius butterflies identified by large-scale targeted sequencing
TLDR
Targeted next-generation sequence capture is used to survey patterns of divergence across these entire regions in divergent geographical races and species of Heliconius, finding major peaks of elevated population differentiation between races across hybrid zones, which indicate regions under strong divergent selection.
Limited performance of DNA barcoding in a diverse community of tropical butterflies
TLDR
This work assesses the applicability of DNA barcoding to a diverse community of butterflies from the upper Amazon, using a group with a well-established morphological taxonomy to serve as a reference and recommends the addition of nuclear sequence data.
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