Biology Reference
In-Depth Information
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GENERATION
Fig. 17.9
Observed heterozygosity across 12 to 63 generations for trials that are identical except
as follows: population growth rate in trials V and W is 1.6 and in v and w is 1.18. Founders
(172) are placed either in a square in the left preserve only (trials V and v) or in two groups,
one in each preserve (trials W and w).
conditions, increasing the height of the corridor from 10% (v and w) to
20% (1 and 2) has a substantial effect on population growth rate, regardless
of the placement of the founders. However, between trials with similar
placement of the founders (1 and v founders in one preserve; 2 and w
split into two preserves), there is not a pronounced difference in unique
allele retention
(Fig. 17.10B)
.
In contrast, some earlier examples (and see
the following example) demonstrated that splitting the founders into two
preserves or two separated groups can have a pronounced effect on unique
allele retention (it can be much higher or lower) compared to trials in which
founders are placed only in the left preserve or in one group. Observed
heterozygosity also differs in a fashion that closely parallels the pattern
seen in Fig. 17.9, with trial 1 closely tracking trial v, and trial 2 very similar
to trial w (data not shown). Again, under these input conditions, observed
heterozygosity is approximately 18% higher when founders are placed in
only one preserve. To summarize, under lower population growth rates
and the other conditions in these trials, population growth, unique allele
retention, and observed heterozygosity are highest when all founders are
placed in one preserve and the corridor is 20%, rather than 10%, high.
The results depicted in Fig. 17.10 show that population growth is
greater under the given conditions (e.g., r = 1.18; long-distance dispersal
(maximum = 2,804 units); corridor height is 10% or 20%) when all 172
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