Perennials - Genetic Diversity in Establishing Plant Populations: Founder Number and Geometry - page 222

<Number_Runs value=“38”/>
<Initial_Population>
<Plant age=“0” X=“0” Y=“0” femaleP=“false”/>
<Plant age=“0” X=“5” Y=“0” femaleP=“true”/>...
... 172 founders placed at the center of the preserve with the lowest left
corner individual placed at point (0,0). There are 4 grid points separating
all adjacent individuals. This is essentially a 13 by 13 founder square with
three extra individuals placed external and central to the square on each of
three sides. Staminate and pistillate individuals are equal in number...
...<Plant age=“0” X=“60” Y=“60” femaleP =“false”/>
<Plant age=“0” X=“65” Y=“60” femaleP =“true”/>
</Initial_Population>
<FoundersF value=“0”/>
We will now use the just described trial M as the basic fi le that will be
modifi ed to examine the interplay of two different factors on population
growth and genetics of developing newly established stands of a dioecious
shrub such as L. benzoin . The fi rst differing input factor involves differences
in gene dispersal distances (offspring versus pollen). Note that in trial M
described just above, frame specifi cations are exactly the same for both
offspring and pollen dispersal: there are four frames of identical distances
for both, and dispersal is 25% to (offspring) or from (pollen) each frame. In
the comparative trials discussed below, frame sizes will remain the same, but
the proportions of genes going to or coming from each frame will differ.
The second input difference in the set of comparative trials that are
all variants of trial M above concerns spatial placement of the founders.
The effects of the exact same dispersal conditions will be examined in two
contrasting series of trials to determine how initial placement of the founders
may interact with the effects of differing dispersal distances. These two
sets of trials are (1) the uppercase trials (M, N, O, and P) in which the 172
founders are placed in a square at the center of the preserve and (2) the
corresponding lowercase letter trials in which the 172 founders are broken
up into four squares, one square of 43 individuals placed in each corner
with the nearest individuals being at least 80 grid points from any border.
In all trials, there are 4 grid points between any two adjacent founders. All
input conditions for these comparative trials are identical to trial M except
as summarized in Table 15.1.
The dispersal differences across these trials relative to trials M and m,
which have 25% of both their offspring and pollen dispersed to or from
each frame, are summarized as follows.