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lowest frequency “private alleles” found in only one of the parental
trees, were fi xed or lost in any subpopulation, and thus none were
fi xed or lost from the entire descendant population (founders were
not included in the survey of the entire descendant population).
2. ISSUE: Was there any evidence of inbreeding due to the small number
of founders and/or brought about by drift and/or spatial effects (some
founders being nearer one another) with consequent forced crossings
among more related individuals? FINDING: There was no evidence of
inbreeding among the descendants of the founders either at the levels
of the whole population or within subpopulations. In fact, there was
some suggestion of possible selection for outcrossed descendants:
West Salem descendants had higher estimated heterozygosity (the
measure used by Pierson et al. and thus used below) and lower levels
of genetic similarity (a statistic not computed by NEWGARDEN as
currently written) compared to the founding individuals. Evidence of
pronounced inbreeding due to the causes noted above, from lowered
estimated heterozygosity values, increased genetic similarity values,
or F values greater than 0.03, was not observed.
3. ISSUE: Is there any evidence that drift has led to genetic differentiation
among subpopulations? FINDING: There was no evidence for genetic
differentiation among the subpopulations in terms of differences in
heterozygosity, differences in private alleles, major differences in gene
frequencies, or increased F values.
NEWGARDEN Simulations
To simulate the establishment of the West Salem stand and investigate
whether patterns in simulated data match those collected from the stand,
the basic trial for this series of comparisons of simulated chestnut population
establishment was trial a. Input conditions and comments where necessary
for that basic trial follow.
The source population has 30 loci, each locus with 100 unique alleles of
equal frequency = 0.01.
<Dioecious value=“false”/>
Age-specifi c offspring reproduction rate: x = age; y = relative rate of
reproduction
<Reproduction_Rate>
<functionpoint x=“0” y=“0”/>
<functionpoint x=“1” y=“0”/>
<functionpoint x=“2” y=“0”/>
<functionpoint x=“7” y=“0”/>
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