Biology Reference
In-Depth Information
Examples Using Varying Offspring and Microgamete Dispersal
Distances
For both offspring and microgamete dispersal the number of zones, and
dispersal probabilities for each zone, are specifi ed by the user in input
fi le statements. These conventions allow the user to explore the effects
of different patterns of offspring versus microgamete dispersal on the
population genetics of developing populations. Dispersal shadows can be
made more leptokurtic or more evenly distributed, or can have relatively
short or long tails, with tails varying as to “thickness”.
The following examples are meant to demonstrate the use of contrasting
dispersal zones. We begin with trials in which the dispersal distance zone
parameters are equal for offspring versus microgamete dispersal. The input
conditions are similar to the trials in the previous section:
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.
Seed reproduction rate = 1.4, with Poisson distribution across reproducers.
Selfi ng rate is 0 with Random Mating value = false = self-incompatible.
Offspring and pollen dispersal distances are always equal to each other
within a trial.
Dispersal distances vary across trials as indicated when trials are under
discussion, but basically have only one dispersal distance maximum (only
one dispersal zone), or four zones of dispersal:
zone 1: 0-5 grid units;
zone 2: 6-12 units;
zone 3: 13-21 units; and
zone 4: 22-300 grid units.
There is no dispersal beyond zone 4.
Probabilities of dispersal to each zone will be given when each trial is
discussed.
The preserve is a square with lower left corner coordinates (-2560, -2560)
and upper right corner coordinates (2559, 2559), which includes 26,214,400
possible grid points to 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: 172 founders, arranged in four approximately square
subgroups of 43 individuals each, each subgroup with the closest individual
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