Biology Reference
In-Depth Information
20000
I
A
M
C
L
15000
C
I
C
M
L
L
10000
I
I
C
M
L
C
I
L
M
M
5000
C
L
I
M
C
I
L
M
C
M
L
I
C
L
M
I
C
L
I
M
L
C
I
M
0
M
L
C
I
L
C
M
I
L
C
M
I
0
2
4
6
8
10
12
14
3000
B
2900
M
L
I
C
2800
C
M
L
I
C
L
I
M
2700
C
L
I
M
C
L
I
M
2600
C
L
I
C
L
M
I
C
L
C
I
C
L
C
CC
M
L
I
L
L
I
I
L
M
I
I
M
M
M
MM
2500
0
2
4
6
8
10
12
14
GENERATION
Fig. 17.3
Population growth (A) and unique alleles retained (B) in trials that compare the effects
of corridors of different heights. The trials are identical to trial C (described fully in the text),
except that while both trials C and L have the 172 founders in one square in the left preserve
placed, at closest, 100 units from the corridor, the height of the corridor in trial L is twice that in
trial C. In both trials I and M the founders are split into two groups of 82, one in each preserve,
with corridor height in trial M being twice that of the corridor height of trial I.
L trial has a height of 40% (2,048 units; 40% corridor). Trials I and M both
have the 172 founders split into two groups, one group in each preserve,
with corridor height being 20% in trial I and 40% in trial M.
As can be seen in Fig. 17.3, expanding the corridor from 20% to 40%
does not make much difference in population growth (graph A). Neither
apparent difference between C and L or between I and M is statistically
signifi cant (at the p < 0.05 level). The greatest distinction, between trials
I and L, amounts to an approximately 10% difference with p = 0.006.
Placement of the founders in two groups again gives a population growth
advantage over placement of founders in one larger group placed in only
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