Geology Reference
In-Depth Information
Table 12.4.
Red colobus
(C. badius)
diet inive studies
Study site
z
T
F
G
K
Study group
M
II
III
cw
Length of study period (months)
12
12
8
12
12
9
12
Mean
%
offeeding records
Leaf buds
14.6
21.6
8.3
16.4
17.5
2.8
14.5
Young leaf (incl. peioles)
32.l
31.8
55.8
36
24
32
27.2
Mature leaf(incl. petioles)
7.3
6.3
2.9
11.5
5.4
44.l
23.7
l.9
b
Leaf stalk
7.3
5.6
3.1
1.5
19.0
Flowers and floral buds
10.6
5.4
8.1
6.2
8.7
6.8
Fruit and seeds
31.7
31.2
23.5
25
35.9
11.4
5.6
Bark
1.9
1.1
0
0.2
3.7
*
*
*
Earth
0.2
0.2
*
Dead wood
0.4
0.2
0.2
Total number of food species
63
62
42
22
39
59
56
Records made by top ranking species %
22.3
19.3
47.2
29.4
43.6
15.4
15.4°
76.6
b
Records made by 5 top rank species
%
67.9
72.8
85.8
78
56
55.9°
Records made by 10 top rank species
%
85.4
88
94
92.3
Records made by 11 top rank species %
86.8
85.4
94.8
93.6
91
Mean index ofspecies diversity
2.123
1.971
1.559
1.925
2.61°
Mean index ofitem diversity
1.466
1.402
1.186
2.21°
Note:
Z, Zanzibar (this study); T, Tana, Kenya (Marsh, 1978a); F, Fathala (Ganot, 1978); G, Gombe
(Clutton-Brock, 1975a); K, Kibale, Uganda (Struhsaker, 1978a).
Value from Struhsaker, 1975.
r
alue from Gatnot, 1975 in Marsh, 1981a.
*
Feeding records below 0.1
%.
observed to be eaten by the monkeys. Groups I,
II, and III were observed to use as ood 63, 62 and
42 ood species, respecively. The species diver-
siy of the food of the Zanzibar red colobus com-
pares with 59 food species for Gombe . b.
tphrosceles (Clutton-Brock, 1972, 1975a) and 56
for ibale
.
b. tephrosceles (Sruhsaker, 1975), but
only 22 food species for Tana River . b.
uo mitratus (Marsh, 1978a, 198la) and 39 for
Senegal
.
similar to those reported for the Tana River . b.
uo mitratus, which had a mean number of species
of 15.2 (range 11-18) (Marsh, 198la).
Diet diversity was further examined by cal-
culating diversity indices. The Shannon-Weiner
diversity index
H
(Wilson & Bossert, 1971) was
calculated for food species and item, using the
formula
n
H
=
-
L
P; loge Pi
i=I
b. temminckii (Ganot, 1978) (see
Table 12.4).
The number of plant species used on any one
day by the Zanzibar red colobus was also diverse.
The mean number of species used each day by
group I was 12
(so
±4.07, range 5-21); for group
II was 9
(so
±3.02, range 5-18) and for group III
7.5
(so
±3.19, range 4-12). These values are
Figure 12.3. Relaionship between abundance in the
phenology sample and conribuion to the monthly diet of six
specific items: young leaves, mature leaves, leaf buds, flower
and floral buds, unripe fruit, and ripe fruits. 0
-
0,
Abundance index, Group I;
x --X,
abundance index, Group
II; •-•, percentage of monthly diet, Group I; . --., per-
centage of monthly diet, Group II.
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