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alive to continuously contribute genes over generations, and they contribute
at more or less equal rates.
Does this mean that for the reintroduction of a long-lived, perennial
species such as chestnut, the spatial patterning of founders is essentially
irrelevant to population dynamics and genetic diversity retention? Might
it be better economically to plant fewer trees at many locations, with
admixture following later? Does such subdivision lead to greater losses of
genetic diversity, at least in terms of heterozygosity? In earlier examples,
it was seen that varying degrees of subdivision and placement of founders
can affect population size and diversity trajectories. Is this also the case for
a very long-lived, iteroparous species such as chestnut when founded by
a larger number of founders?
To investigate these issues, six NEWGARDEN trials were run that
model a virtual chestnut species with similar life-history characteristics to
those used in the West Salem examples above but with different founder
spatial patterning and different pollen and offspring dispersal distance
schedules. The basic trial for this series of six comparative trials is trial a,
summarized as follows:
Thirty loci, each with 100 different alleles of equal frequency.
The source population is in Hardy-Weinberg equilibrium.
Trees are bisexual with no selfi ng (thus random mating is not perfect:
selfi ng is excluded).
Age-specifi c offspring production rates (x = year; y = relative rate):
<functionpoint x=“0” y=“0”/>
<functionpoint x=“1” y=“0”/>
<functionpoint x=“2” y=“0”/>
<functionpoint x=“7” y=“0”/>
<functionpoint x=“8” y=“0.02”/>
<functionpoint x=“10” y=“0.04”/>
<functionpoint x=“12” y=“0.08”/>
<functionpoint x=“17” y=“0.2”/>
<functionpoint x=“70” y=“1.3”/>
<functionpoint x=“320” y=“1.3”/>
<functionpoint x=“400” y=“0.20”/>
<functionpoint x=“600” y=“0.01”/>
Age-specifi c pollen contribution rates (x = year; y = relative rate):
<functionpoint x=“0” y=“0”/>
<functionpoint x=“1” y=“0”/>
<functionpoint x=“5” y=“0”/>
<functionpoint x=“6” y=“0.2”/>
<functionpoint x=“10” y=“0.5”/>
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