Table 1.

A comparison of the simulation models of Ramachandran et al. (2005) and our present model. (Only major differences are mentioned.)

	Ramachandran et al. (2005)	our present model
number of demes in total	100	251
population growth	exponential growth rate of 1.8 with excess above carrying capacity culled randomly	logistic growth with an initial growth rate of 1.8 that caps at carrying capacity
genome	haploid (Y-chromosome)	diploid
reproduction	genome of child identical to genome of father	genome of child created from genome of parents by Mendelian segregation
colonization rate	one colonization event every 20 generations	variable parameter
number of founders	250	variable parameter; determined by the carrying capacity and the colonization rate
exchange rate	no exchange between neighbouring populations	variable parameter
carrying capacity	above 5000	below 5000; variable parameter
origin of expansion	at the left edge of the deme array	in the interior of the deme array, with 50 demes on the left and 200 on the right