Sympatric speciation in structureless environments

Table 1 Range of population sizes and basic statistics of the parameter values of m for random (value of m has no affect) and m-trait mating (i.e. assortative mating when m < 0.5, dissasortative mating when m > 0.5) simulations at the end of the 250 and 500 generation epochs

N (runs)	Agent ranges across runs	Mean ± stdev across “within run means”	Mean ± stdev across “within run stdev”
At generation 250^a
Random 124	239–361	0.49 ± 0.13^b	0.17 ± 0.05
m-Trait 80	256–348	0.21 ± 0.09^b	0.11 ± 0.05
At generation 500^c
Random 15	265–334	0.53 ± 0.20^b	0.10 ± 0.07
m-Trait 15	263–350	0.10 ± 0.09^b	0.06 ± 0.04

^aThe difference between distributions of m values for random versus m-trait mating are plotted in Fig. 1
^bSignificance evaluated using a two-tailed non-parameteric Mann-Witney U test. For 250 generations
p < <0.001, for 500 generation p < 0.01
^cAdditional details in Table 2

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