Biology Reference
In-Depth Information
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m m m m m m m m m m m m m m m m m m m m m m m m
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M M M M M M M M M M M M M M M M M M M M M M M M
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W W W W W W W W W W WW W W W W WW W W W W W
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v v v v v v v v v v v v v v v v v v v v v v
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0
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GENERATION
Fig. 15.11 Mean percentage of unique alleles retained (calculated as: (generation unique alleles
retained/original number of unique alleles in the founders for a given trial) * 100) across 30
generations for trials modeling establishment of the dioecious shrub Lindera benzoin . In some
trials, 172 founders were placed either in squares of 43 at each corner with no founder closer
than 80 grid units from a border (trial m), or in a single central square in the preserve (trial M).
In other trials, there was only one square group of 43 founders placed either at one preserve
corner with no founder closer than 80 grid units from a border (trial v), or in a single central
square in the preserve (trial W). Thus these latter two trials have a lower number of initial
unique alleles. In every trial, there were 4 grid points between all adjacent founders. All other
conditions among trials are the same (see specifi c conditions for trials m and M, given in the
text). Means are calculated from 45 duplicate runs per trial.
1. Introducing the same number of founders at borders as in the centre
does not induce substantial differences in rates of unique allele loss.
2. F values are not strongly affected by placement of founders near
borders (and the consequent decrease in population growth) versus
central placement.
3. F values are not strongly affected by Wahlund effect when the founders
are subdivided.
4. Trial population m is similar to trial M in terms of expected
heterozygosity since these populations are large enough to have
duplicates of rare alleles and thus the percentage of allelic loss is not
as great as for the smaller populations (trials v and W). However, trial
m is most similar to trials v and W in terms of observed heterozygosity
since all three trials have smaller separate groups of 43 individuals
 
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