Dispersal - Genetic Diversity in Establishing Plant Populations: Founder Number and Geometry - page 170

Thirty loci, each with 100 unique alleles of equal frequency = 0.01. A total
of 3,000 different alleles are thus available across these loci.
Bisexual annuals.
Offspring reproduction rate = 1.4, with Poisson distribution across
reproducers.
Selfi ng rate is 0 except that Random Mating value = true, so selfi ng will
occur in proportion to the number of other available pollen donors (there
will be relatively more selfi ng at low population densities).
Offspring = pollen dispersal distances, with trials having species average-
density-grid-unit maximum dispersal distances that vary as follows:
2 (offspring and microgamete dispersal within the nearest 25 grid
points)
5 (offspring and microgamete dispersal within the nearest 121 grid
points)
12 (offspring and microgamete dispersal within nearest 625 grid
points)
or 30 (offspring and microgamete dispersal within nearest 3,721 grid
points).
The preserve is a square with lower left corner coordinates (-2560, -2560)
and upper right corner coordinates (2559, 2559), which includes 26,214,400
grid points that can potentially be occupied.
Most runs are for 15 rounds of reproduction (unless indicated otherwise),
and data points in graphs represent the mean value of 30 replicate runs of
the input conditions for a trial.
The founders: Lawrence et al. (1995) have suggested that founding
populations with 172 founders drawn from a source population will
include at least one copy of each unique allele at each locus, as long as the
allele has a source population frequency not less than 0.05. Here we used
172 founders, arranged in a 13 by 13 founder square, with one additional
individual placed at the end of rows 1, 7, and 13. The number of grid points
between founding individuals was 0, 4, or 10, as described when results
are presented. Note that using these loci and founder array confi gurations
allows us to explore the loss of unique alleles with frequencies < 0.05.
In Figs. 12.2 through 12.5, the growth of populations and changes
in measures of population genetic diversity for stands with the above
NEWGARDEN input conditions are shown when founders are placed in
a square with no spaces between founders (graphs A), 4 spaces between
founders (graphs B), or 10 spaces between founders (graphs C). Within each
graph representing these three different founder arrangements, population
trial input conditions also differed as to offspring and microgamete dispersal
distance: populations a, e, and i had both offspring and microgametes
dispersed a maximum of 2 grid units; b, f and j dispersed to a maximum