Biology Reference
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<functionpoint x=“18” y=“0.87”/>
<functionpoint x=“55” y=“0.97”/>
<functionpoint x=“701” y=“1”/>
</Dispersal_Distance>
Pollen dispersal:
<EasyPollen>
<pollenframe low=“0” high=“8” prob=“0.7”/>
<pollenframe low=“9” high=“18” prob=“0.17”/>
<pollenframe low=“19” high=“55” prob=“0.1”/>
<pollenframe low=“56” high=“701” prob=“0.03”/>
<pollenframe low=“702” high=“Inf” prob=“0.0”/>
</EasyPollen>
Two square preserves, each 5,120 units on a side, separated by a 20% corridor
(1,024 units high by 1,024 units long).
The analysis ran through generation 29, and statistics were calculated on
averages of 70 repetitions per trial.
All 172 founders are placed in the left preserve, with four spaces between
them, and no founder is less than 100 units from the corridor entrance.
The two trials differ in that the founders in trial h are arranged in three
rows (57, 58, 57) perpendicular to the corridor, while the founders in trial
j are arranged in a square.
The input conditions to these trials are similar to those for perennial
basic trial 1, described in detail above. However, populations h and j grow
more slowly than previous examples, partly because of the greater rates of
mortality compared to previous perennial trials in this chapter (compare
the mortality statements given for trials h and j with input details for the
basic perennial trial 1, above).
Under these conditions, when the founders are placed in three long
rows (trial h), population growth is slower than when the founders are
placed in one square (trial j; Fig. 17.17A) . This result stands in contrast
to previous results where placing founders in three long rows yielded
increased population growth (e.g., Fig. 17.15 ), although conditions differ
somewhat among these trials. By generation 29, there is a 19.6% increase
for population j. Unique allele loss (graph B) is also less for trial j, there
being a 15.7% difference by generation 29 (graph B). Note that it appears
that unique alleles will be lost from both populations over the next several
generations. These results demonstrate that it can be very important to
consider projected rates of mortality for perennial founders in projecting
population growth relative to founder spacing.
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