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Stick Insect Genomes Reveal Natural Selection’s Role in Parallel Speciation
Stick to the Bush Can the underlying genetic changes driving the divergence of populations into new species be predicted or repeated? Soria-Carrasco et al. (p. 738) investigated the genetic changes
The role of predator selection on polymorphic aposematic poison frogs
A purifying role for predator selection is demonstrated, as brightly coloured novel forms are more likely to suffer an attack than both local aposematic and cryptic forms, and colour patterns of poison frogs may truly represent a ‘magic trait’.
Experimental evidence for ecological selection on genome variation in the wild
It is documented that selection affected multiple genetic loci distributed across the genome, particularly in transplants to the novel host, and how genomic data can identify previously underappreciated ecological sources and phenotypic targets of selection is illustrated.
Evolution of Camouflage Drives Rapid Ecological Change in an Insect Community
A pervasive effect of ongoing evolution in a spatial context on population and community dynamics is demonstrated, and an eco-evolutionary model makes testable predictions about the influence of the spatial configuration of the patch network on metapopulation size and the spatial scale of adaptation.
Genomic consequences of multiple speciation processes in a stick insect
Patterns consistent with effects of numerous factors are found, including geographical distance, gene flow, divergence in host plant use and climate, and selection against maladaptive hybridization in a system undergoing ecological speciation.
Geographic Mode of Speciation and Genomic Divergence
Three major issues are discussed concerning the relationship between gene flow, genomic divergence, and speciation: patterns expected in the presence versus absence of gene flow; processes, such as direct selection and genetic hitchhiking, allowing for divergence with gene flow%; and the consequences of the timing of when gene flow occurs during speciation.
Genome-Wide Association Mapping of Phenotypic Traits Subject to a Range of Intensities of Natural Selection in Timema cristinae*
No relationship between variation in levels of divergence among traits in nature and variation in parameters describing the genetic architecture of those same traits is found, and a modest number of SNPs that were associated with traits and sometimes explained a large proportion of trait variation are identified.
Transitions between phases of genomic differentiation during stick-insect speciation
Intermediate phases of speciation are associated with genome-wide differentiation and mate choice, but not growth of a few genomic islands, and a gap in genomic differentiation between sympatric taxa that still exchange genes and those that do not is found.
Selection on a Genetic Polymorphism Counteracts Ecological Speciation in a Stick Insect
An individual-based model is developed that shows how the melanistic phenotype acts as a "genetic bridge" that increases gene flow between populations living on different hosts that impose constraints on both local adaptation and speciation.
Highly contiguous assemblies of 101 drosophilid genomes
Oxford Nanopore sequencing is utilized to build an open community resource of high-quality assemblies for 101 lines of 95 drosophilid species encompassing 14 species groups and 35 sub-groups with an average contig N50 of 10.5 Mb and greater than 97% BUSCO completeness in 97/101 assemblies.