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Figure S1. A comparison of results for gametic dispersal (black-dashed lines) and diploid dispersal (blue solid lines) on (a) FIS relative to its value when φ = 0 and (b) FST relative to its value when φ = 0 as a function of φ.

Figure S2. Expected values of FST as a function of diploid migration rate, m, in the small mutation rate limit of a finite island model when φ = 0.1, 0.5, and 0.7 (dotted, solid, and dashed lines, respectively).

Figure S3. The effect of population size, N, upon the expected coalescence time under collective dispersal relative to no collective dispersal.

Figure S4. FST (eq. 9b) as a function of extinction rate for φ = 0 (dashed line) and φ = 1 (solid line).

Table S1. Parameter definitions for the gametic/diploid dispersal life cycles.

Table S2. The coefficients for the expected coalescence time expression Ti = (ai + biϕ)ND under gametic dispersal when m = 0.8, N = 100, and s = 1/100.

Table S3. The coefficients for the variance in coalescence times, var[Ti] = (ci + diϕ + eiϕ2)N2D2 under gametic dispersal when m = 0.1, N = 100, and s = 1/100.

Table S4. Coalescence times and F-statistics from the models with gametic and diploid dispersal (N is the number of diploid adults in a deme).

Table S5. The additional contribution from collective dispersal to coalescence times relative to ϕ = 0 for gametic and diploid dispersal (N is the number of diploid adults in a deme).

Table S6. A comparison of predicted within-deme (πs) and total (πt) genetic diversities from the model of collective dispersal presented here (eq. S21) and the approximations from Table 2 of Pannell and Charlesworth (1999), referred to as PC99.

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