Biology Reference
In-Depth Information
simulation one could change one, two, three until 100 males by lineage and the simulated F-
statistics did not vary. In an identical sense, the simulated results did not change if there was
one sex or other for migration (d
m
= 0.22 or d
f
= 0.22, but not both sexes simultaneously).
Simulation K had values s = 8, n = 7, m = 1, b = 4.1, and g = 1250 (and the migration rates,
for males d
m
= 0.22, or for females d
f
= 0.22). With these values, this simulation yielded the
following asymptotic F-statistic values: F
LS
= 0.26083, F
IL
= -0.06088, F
IS
= 0.21584. These
results were also practically identical to the real ones.
Henceforth, the following primary foci were determined from these simulations:
1.
The negative value of F
IL
suggests that
Inia
conforms to a social reproductive
system, with philopatric sex and with some migrant sex, although the migrant
potential of this sex is very low.
2.
The number of lineages,
s
, affects the values of and 1 - but not the F-statistic
values.
3.
The optimal number of reproductive females,
n
, in each lagoon was seven. If the
reproductive female number will be eight, nine or ten (higher than seven), the F
IS
and
F
LS
will be lower than the real values, while the F
IL
value will be higher than the real
one. On the contrary, if the reproductive female number will be six or five (lower
than seven), the F
IS
and F
LS
will be higher than the real values, while the F
IL
value
will be lower than the real one.
4.
The number of reproductive males in each lineage,
m
, did not influence the
calculated F-statistic values. For example, values from one to 100 will offer the same
results.
5.
The optimal number of females in a lineage which bred with the
ith
male,
b
, was
around 4. If this parameter is higher (five, six, etc), the F
IS
and F
LS
will be higher
than those estimated directly from the molecular data, while F
IL
will be lower. If
b
is
lower (three, two, etc), the contrary will be true.
6.
The specific number of generations chosen (g = 1,250) is really irrelevant because in
a very few number of generations, the asymptotic values of the simulated F-statistics
was reached.
7.
The optimal migration rates for males,
d
m
, or for females,
d
f
,
should be around 0.22
for one sex or for the other, but not for both simultaneously. If d
m
or d
f
will be
higher, F
IS
and F
LS
will be lower than the observed values. If the migration rates were
multiples of d
m
and d
f
, then F
IS
and F
LS
would also lower than the observed F values.
8.
The optimal probability that females selected the same male with which to breed, ,
was around 0.30.
D
ISCUSSION
General Aspects
The pink river dolphins sampled in the Napo and the Curaray rivers were captured in a
river margin (sandy beach) and in seven different lagoons. As many studies have previously
demonstrated, pink river dolphins are seen more often in lagoons, river margins and river
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