Environmental Engineering Reference
In-Depth Information
Box 5.4
Factors affecting sustainability of co-managed fisheries.
In Box 4.6, we discussed the results of Halls
et al
.'s (2002) study in which they
looked at factors affecting the sustainability of small-scale co-managed fisheries.
They also developed a Bayesian Network model as part of the study. This model
can be graphically represented as Figure 5.7:
Management type
govt
co mgt
13.0
54.0
33.0
trad
Stability
stable
unstable
76.4
23.6
Democratically elected
no
yes
56.7
43.3
Respectability
lo med
hi
Fisher representation
Number of gears
39.3
60.7
lo
med hi
45.2
54.8
lo
hi
48.8
51.2
Clear access
rights
Conflict resolution
no
yes
no
yes
17.3
82.7
38.1
61.9
Poaching
Control and surveillance
lo
med hi
46.7
53.3
lo
med hi
40.6
59.4
Fisher density
lo
hi
45.0
55.0
Compliance
CPUE change
declining
static rising
Equity
lo
med hi
41.0
59.0
51.9
48.1
lo
hi
27.4
72.6
Fig. 5.7
Bayesian network model for the sustainability of co-managed
fisheries. The squares represent nodes, each of which has a conditional
probability table associated with it, and the arrows are causal links (for
example the probability of the fishery being stable is conditional only on
management type). The bars for each node represent the overall prevalence
of a particular state in the dataset.
