Zenodo release V1.1: Phylogeography and paleoclimatic range dynamics explain variable outcomes to contact across a species’ range

Code for the data archive on Zenodo for the journal article: Phylogeography and paleoclimatic range dynamics explain variable outcomes to contact across a species’ range

Abstract:
Replicability of divergence after contact is a poorly characterized process, particularly in the contexts of phylogeography and post-glacial range dynamics within species. Using contact zones located at the leading-, mid-, and rear-edges of a species’ range, we examined variation in outcomes to contact between divergent lineages of Campanula americana. We investigated whether contact zones vary in quantity and directionality of gene flow, how phylogeographic structure differs between contact zones, and how historic range dynamics may affect outcomes to contact. We found that all contact zones formed at similar times via primary contact yet detected significant admixture in only the rear-edge contact zone. In the northern leading-edge contact zone and the mid-range Virginia contact zone, gene flow was minimal and asymmetric. In the southern rear-edge contact zone, gene flow was strong and symmetric. Asymmetric admixture in the leading-edge and Virginia contact zones matches the directionality of a known cosmopolitan cytonuclear incompatibility between lineages of C. americana. Our results emphasize the dependence of speciation processes on phylogeographic structure, evolutionary history, and range dynamics.

Code V1.1: Phylogeography and paleoclimatic range dynamics explain variable outcomes to contact across a species’ range

Code required to run analyses from the journal article: "Phylogeography and paleoclimatic range dynamics explain variable outcomes to contact across a species’ range."

Abstract:
Replicability of divergence after contact is a poorly characterized process, particularly in the contexts of phylogeography and post-glacial range dynamics within species. Using contact zones located at the leading-, mid-, and rear-edges of a species’ range, we examined variation in outcomes to contact between divergent lineages of Campanula americana. We investigated whether contact zones vary in quantity and directionality of gene flow, how phylogeographic structure differs between contact zones, and how historic range dynamics may affect outcomes to contact. We found that all contact zones formed at similar times via primary contact yet detected significant admixture in only the rear-edge contact zone. In the northern leading-edge contact zone and the mid-range Virginia contact zone, gene flow was minimal and asymmetric. In the southern rear-edge contact zone, gene flow was strong and symmetric. Asymmetric admixture in the leading-edge and Virginia contact zones matches the directionality of a known cosmopolitan cytonuclear incompatibility between lineages of C. americana. Our results emphasize the dependence of speciation processes on phylogeographic structure, evolutionary history, and range dynamics.