Fig. 2. Population mean probabilities of spawning
as a function of shared ecomorph. Each
point is the corrected fraction of all trials in
which spawning resulted when individuals from
a given pair of populations were tested. Comparisons
A and B highlight the tests of the two
predictions of parallel speciation. First, within
an ecomorph the probability of spawning is
compared for combinations of populations
from the same or different lakes (comparison
A). Second, the probability of spawning between
populations of the same ecomorph from
different lakes is compared with that between
ecomorphs from different lakes (comparison B).
Comparison C tests for a difference in the
strength of reproductive isolation between
populations of different ecomorphs from the
same and different lakes. Because our statistical
analysis used conservative paired t tests that
treated each population of females as a replicate
(24, 25), the comparisons shown here
represent the nature of the tests but do not
depict the exact analyses performed.