Biology Reference
In-Depth Information
18000
M
R
L
A
S
L
12000
M
L
R
R
S
M
L
M
R
S
6000
L
M
R
S
S
L
M
R
S
L
M
R
L
S
M
R
L
S
M
L
R
S
M
L
R
S
M
R
M
L
S
0
M
L
RRR
SSS
M
L
0
5
10
15
3000
2900
M
R
S
B
L
2800
M
L
L
2700
M
R
L
S
M
L
2600
M
L
M
L
L
M
L
L
LLL
M
M
R
M
M
MM
2500
S
R
S
2400
R
R
S
R
R
R
R
RR
R
S
2300
S
S
S
S
SS
S
2200
0
5
10
15
GENERATION
Fig. 17.5
Population growth (A) and unique alleles retained (B) in trials that are identical in
most input conditions (e.g., all have the corridor height 40% the length of one preserve side;
r = 1.6). However, the trials differ as follows: all 172 founders are placed in one square in one
preserve (L and R) or split into smaller squares placed one in each preserve (M and S); pollen
and offspring dispersal distance frames are relatively short in L and M (maximum = 701 units)
and four times longer in R and S (maximum = 2,804; note arrows).
consider population growth (graph A) for trials M and S with founders split
into two preserves and dispersal four times as great in the latter. After 12
generations, short-distance dispersal (M) yields an 11.6% larger population
size compared to long-distance dispersal. However, at 10 generations,
this relationship is a 26% difference. When the founders are placed in one
preserve, after 12 generations, there is no difference in mean population
growth dependent on dispersal distance (trials L and R do not differ).
However, at generation 10, L (short-distance dispersal) is 16.8% greater
than R (p = .003). Thus, less difference occurs between the short- and long-
distance dispersal trials for both founding patterns as the 12th generation
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