Data from: Refining the conditions for sympatric ecological speciation

Few studies, however, have combined the three factors and investigated their interactions. In this article, I analytically derive conditions for sympatric speciation in a general model where the distribution of resources can be uni- or bimodal, and where a parameter controls the range of resources that an individual can exploit. This approach bridges the gap between models of a unimodal continuum of resources and Levene-type models with discrete resources.

I then test these conditions against simulation results from a recently published article (Thibert-Plante and Hendry 2011) and confirm that sympatric ecological speciation is favoured when (i) selection is disruptive (ie, individuals with an intermediate trait are at a local fitness minimum), (ii) resources are differentiated enough, and (iii) mating is assortative. I also discuss the role of mating preference functions, and the need (or lack thereof) for bimodality in resource distributions for diversification.

Usage notes

FDebarre_JEB-2621_SuppInfo-Mathematica Mathematica notebook with the analytical derivations of the results. FDebarre_JEB-2621_R-scripts Zipped folder with all the R scripts used in the study. To evaluate them, unzip the folder, launch R, go to the folder where the scripts are, and type source('MASTERFILE.R') .

All the figures will be created and saved as pdfs in the figures folder. FDebarre_JEB_2621_Appendix pdf printout of the Mathematica and R files. FDebarre-JEB_2621_Appendix.pdf FDebarre_JEB-2621_FigsS1-4 Supplementary figures.