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Appendix S1: Changes in mean phenotype and population size along the life cycle.

Appendix S2: Viability and stability of the wide niche equilibrium.

Appendix S3: Approximation for viability of the narrow niche equilibrium.

Appendix S4: Effects of habitat heterogeneity and intensity of selection.

Appendix S5: Results with Beverton--Holt density regulation.

Appendix S6: Extinction of both populations.

Code for numerical iteration and simulation of the models deposited at Dryad: doi:10.5061/dryad.hd412

Figure S1: Isoclines of maximal perturbation size p* as a function of pollen and seed dispersal probabilities.

Figure S2: Critical genetic variances VSCinfg, VSCsupg, VNHinfg, Vviabg and its approximation by equation (4), computed with the analytical model as a function of habitat heterogeneity Δ, for two different intensities of selection.

Figure S3: Critical genetic variances VSCsupg and VSCinfg, computed with the analytical model as a function of pollen dispersal mp, for fixed values of total dispersal mt.

Figure S4: Critical genetic variances VSCinfg, VSCsupg, VNHinfg, VNHsupg, Vviabg, and its approximation by equation (4), computed with the analytical model as a function of pollen dispersal mp, for fixed values of seed dispersal ms and habitat heterogeneity Δ.

Figure S5: Mean number of generations computed from simulations before niche contraction as a function of total dispersal mt (secondary contact scenario).

Figure S6: Mean number of generations computed from simulations before shift from narrow to wide niche equilibrium (new habitat scenario) as a function of pollen and seed dispersal probabilities.

Figure S7: Probability of extinction of both populations as a function of seed dispersal probability ms (simulation model, secondary contact scenario).

Figure S8: Probability of extinction of both populations as a function of seed dispersal probability ms (simulation model, new habitat scenario).

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