Biology Reference
In-Depth Information
retained among any of these trials. Under the given conditions, distance of
placement of the founders from a corridor had no appreciable effect.
How does the height of a corridor affect its success in preserving
genetic diversity? In
Fig. 17.3,
four trials are compared in which corridor
height differs while holding other conditions constant except as will now be
described. For every trial, the founders nearest to the corridor are 100 units
away from the corridor entrance, and the corridor has a length that is 20%
of the length of one side of the square preserve (1,024 units long). Trials C
and L are identical with the 172 founders placed in one square in the left
preserve only, but trial C has a corridor that has a height of 20% of one side
of the corridor (1,024 units high; referred to as a “20% corridor”), while the
20000
I
A
y
C
E
15000
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10000
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GENERATION
Fig. 17.2
Population growth (A) and unique alleles retained (B) in trials that compare the effects
of placing the founders at different distances from corridors. The solitary square of 172 founders
is placed with founders at least 100 units (trial C), 300 units (E), or about 2,500 units (y) from
the opening to the corridor. In trial I, founders are placed in two groups, each 100 units from
the corridor. All other conditions are the same. See text for complete description of trial C.
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