Geology Reference
In-Depth Information
60
•
Plant species
D
Plant part/species
50
.
o
40
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)
>
0
>
...
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..
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30
0
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20
10
0
R/BW
R/S
R/M
BW/S
BW/M
S/M
Species pair
Figure
13.3.
Dietary overlap in plant species (solid bars) and plant part/species (shaded
bars) among each forest monkey species pair. Abbreviaions as in Figure
13.1.
was equivalent to their plant species overlap,
presumably because of their common preference
for ripe fruit (Figure 13.2). In contrast, the unique
preference for leaf peioles among he red colobus
resulted in its having a significantly lower part/
plant species overlap than plant species overlap
with all other primate species (with black-and-
white colobus, P < 0.01; with Sykes monkey,
P < 0.02; and with mangabey, P < 0.04). The
par/plant species overlap also was significantly
lower than tl1e plant species overlap among the
black-and-white colobus and the mangabey
(P < 0.04, Wilcoxon signed-rank test; Figure
13.3).
est. They were most common between red col-
obus and black-and-white colobus, and least
common between the Sykes monkey and
mangabey. Moreover, these tendencies persisted
even after adjusing for differences in availabiliies
of each primate species. Dietary overlap appeared
to be an important predictor of these interspecific
associations. Thus, the highest rates of interspeci-
fic association were found among the two primate
species that had high plant species overlap in con-
junction with
relaively low plant part/species
overlap. High plant species overlap might be
epected to favour mixed-species associations
because different primate species would have
more similar needs to forage in the same species
oftree at any point in ime (i.e. conflicts of interest
over the tree species in which to forage would be
low). However, high plant species overlap also
may have associated costs owing to interspecific
Discussion
Interspecific associat10ns were quite prevalent
among the monkeys in the Uzungwa montane for-
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