Transgressive segregation in mating traits drives hybrid speciation

Hybridization can instantaneously generate novel genetic variation, which can promote ecological speciation by creating novel adaptive phenotypes. However, it remains unclear how hybridization, creating novel mating phenotypes (e.g., mating season, genitalia shapes, sexual displays, mate preferences), affects speciation especially when the phenotypes do not confer adaptive advantages. Here, based on individual-based evolutionary simulations, we propose that transgressive segregation of mating traits can drive incipient hybrid speciation. Simulations demonstrated that incipient hybrid speciation occurred most frequently when the hybrid population received moderate continued immigration from parental lineages causing recurrent episodes of hybridization. Recurrent hybridization constantly generated genetic variation, which promoted the rapid stochastic evolution of mating phenotypes in a hybrid population. The stochastic evolution continued until a novel mating phenotype came to dominate t..., Java programs for individual-based computer simulations, R codes to analyze and visualize simulation results, and final output files of the computer simulations. , Codes and data for “Transgressive segregation in mating traits drives hybrid speciation” by Kotaro Kagawa, Gaku Takimoto & Ole Seehausen. =========================================== Reference Kagawa K, Takimoto G, & Seehausen O. (2023). “Transgressive segregation in mating traits drives hybrid speciation”, Evolution, (https://doi.org/10.1093/evolut/qpad072) ========================================== Code Overview There are four main directories: “Java_IBM_Matching”, “Java_IBM_PreferenceTrait”, “R_Scripts”, and “Appendix_configs_Figures”. Directories “Java_IBM_Matching” and “Java_IBM_PreferenceTrait” contain Java source cords for our individual-based evolutionary simulations with the matching model and preference/trait model, respectively. The directory “R_Scripts” contains R scripts for analyzing and visualizing simulation results. The directory “Appendix_configs_Figures” contains 2 subdirectories including 48 sub-subdirectories, each of which contains four input files for runni...