iForest - Biogeosciences and Forestry


SimHyb: a simulation software for the study of the evolution of hybridizing populations. Application to Quercus ilex and Q. suber suggests hybridization could be underestimated

Álvaro Soto   , David Rodríguez-Martínez, Unai López De Heredia

iForest - Biogeosciences and Forestry, Volume 11, Issue 1, Pages 99-103 (2018)
doi: https://doi.org/10.3832/ifor2569-011
Published: Jan 31, 2018 - Copyright © 2018 SISEF

Research Articles

Collection/Special Issue: INCOTW - Sassari, Italy (2017)
International Congress on Cork Oak Trees and Woodlands
Guest Editors: Piermaria Corona, Sandro Dettori

We present SimHyb, a Java-based software for the simulation of mixed hybridizing populations. The software incorporates user-defined initial parameters and input files to account for the initial census size of two species in a closed population, the number of intermediate specific classes, the directional fertility among specific classes, the fitness coefficients for each specific class, the inheritance of fitness, and the degree of ageing and self-incompatibility of the individuals. All these demographic and adaptive parameters can be modified by the user to analyze their effect on the evolution of the mixed population. SimHyb allows the traceability of each individual, whose pedigree is also recorded. For each simulated generation the software yields an output file that is easily convertible to an input for Structure, one of the most popular softwares for the Bayesian analysis of populations. Application of SimHyb to simulate Quercus ilex and Q. suber hybridizing populations, and further analysis with Structure, reveals that advanced introgressed individuals are very often misclassified with the currently available set of nuclear microsatellite markers, so that introgression between these two species could have been underestimated in previous studies. However, we provide a simple parameter based on Structure results to identify the directionality of pollination in the progeny of a known mother tree.


Hybridization, Introgression, Simulations, Molecular Markers, Quercus suber, Quercus ilex

Authors’ address

Álvaro Soto
David Rodríguez-Martínez
Unai López De Heredia
GI Genética, Fisiología e Historia Forestal, Dept. Sistemas y Recursos Naturales, ETSI Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, Madrid (Spain)

Corresponding author



Soto Á, Rodríguez-Martínez D, López De Heredia U (2018). SimHyb: a simulation software for the study of the evolution of hybridizing populations. Application to Quercus ilex and Q. suber suggests hybridization could be underestimated. iForest 11: 99-103. - doi: 10.3832/ifor2569-011

Academic Editor

Piermaria Corona

Paper history

Received: Jul 28, 2017
Accepted: Jan 12, 2018

First online: Jan 31, 2018
Publication Date: Feb 28, 2018
Publication Time: 0.63 months

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