Perennials - Genetic Diversity in Establishing Plant Populations: Founder Number and Geometry - page 223

Table 15.1 Details of trials comparing the interaction of two different types of input conditions
of establishing dioecious short-lived shrub populations.
The fi rst type of input variation involves differences in gene dispersal distances (offspring
versus pollen). The second entails differences in spatial placement of the founders. Trial M,
which is described in detail in the text, is the basic fi le for this series of comparative trials.
These trials all have identical input conditions except as follows. Trials designated with an
uppercase letter have founders in one central square, whereas in lowercase trials, the same
number of founders is broken into four groups with one group placed in each corner at a
distance of at least 80 grid point units from any preserve border.

Trial

% offspring % pollen

to each frame from each frame

Frame 1 M and m 25 25

0-6 units N and n 43 25

O and o 25 43

P and p 25 10

Frame 2 M and m 25 25

7-13 units N and n 30 25

O and o 25 27

P and p 25 20

Frame 3 M and m 25 25
14-22 units N and n 17 25
O and o 25 20
P and p 25 27
Frame 4 M and m 25 25
23-301 units N and n 10 25
O and o 25 10
P and p 25 43
Summary: relative to the basic trials M and m, which have 25% of their offspring and pollen
dispersed to or from each frame, the following is observed.
In trials N and n, more offspring are dispersed more closely to the maternal plant; 25% pollen
from each frame.
In trials O and o, 25% of an individual's offspring are dispersed to each frame; more pollen
comes from nearer the maternal plant.
In trials P and p, 25% of an individual's offspring are dispersed to each frame; more pollen
comes from a greater distance from the maternal plant.

In trials N and n, more offspring are dispersed more closely to the maternal
plant; 25% pollen from each frame.
In trials O and o, 25% of an individual's offspring are dispersed to each
frame; more pollen comes from nearer the maternal plant.
In trials P and p, 25% of an individual's offspring are dispersed to each frame;
more pollen comes from a greater distance from the maternal plant.

The effects of these differences on population growth can be seen in Fig.
15.1. Under the given conditions, positioning the founders in four corner
groups at least 80 units from any border produces lower rates of population