Fisheries in the Southern Border Zone of Takamanda - Impact ...

160 Sunderland et al.
No. of individuals (n = 142)
80
70
60
50
40
30
20
10
0
0~10
10~20
20~30
30~40
40~50
4 Results and Discussion
4.1 Bush mango (Irvingia gabonesis 1 )
Table 3 summarizes the transect data for Irvinga
gabonensis). The Takamanda and Matene sites have a
greater abundance of bush mango than Obonyi I and
Mfakwe. Takamanda and Obonyi I have relatively few
large-diameter individuals (>10 cm dbh), indicating that
there are less productive trees in these areas. In the case
of Takamanda, this is because of poor recruitment and
survival to maturity, most likely stemming from overharvesting
of fruit. Matene is by far the most productive
Takamanda: the Biodiversity of an African Rainforest
50~60
60~70
Size-class (cm)
70~80
80~90
90~100
Figure 2. Number of individuals sampled and size-classes for bush mango, Takamanda Forest Reserve, Cameroon.
Site
Total no. of
individuals
Mean no. of
individuals/ha
>100
area for bush mango, with high numbers of individual
trees >10 cm dbh.
The cumulative size-class distribution for bush
mango shows irregularities in recruitment (Figure 2).
This may be caused by the tendency of bush mango to
mast, but is more likely due to long-term harvesting of
fruits and seeds.
1 Irvingia wombolu is not common in the TFR and was
not encountered during the inventory.
Table 3. Summary of data collected from transects for bush mango in Takamanda Forest Reserve, Cameroon
Mean no. of
individuals/ha
>10cm dbh
Mean dbh
(cm)
Takamanda 51 12.75 2.5 10.07
Obonyi I 23 5.75 3 43.7
Matene 46 11.5 8.25 38.02
Mfakwe 22 5.5 3.75 23.5
Mean (all sites) 35.5 8.88 4.38 28.82