Environmental Engineering Reference
In-Depth Information
They have three outcome nodes that represent aspects of sustainability—
compliance, equity and catch per unit effort. These are influenced by a range of
factors, each of which is expressed as a set of discrete values (e.g. yes/no or
high/low). For example, 54% of the fisheries in the study were co-managed,
and the overall probability of a fishery in the study having a declining CPUE
was 51.9%. The network represents the chain of causation between the factors.
Management
type
govt
co mgt
trad
100
0
0
Stability
stable
unstable
95.0
5.00
Democratically
elected
no
yes
29.0
71.0
Respectability
lo med
hi
Fisher representation
Number of gears
o
61.8
38.3
l
med hi
95.0
5.00
lo
hi
57.0
43.0
Clear access
rights
Conflict resolution
no
yes
35.2
64.8
no
yes
73.4
26.6
Poaching
Control and surveillance
lo
med hi
21.8
78.2
lo
med hi
80.9
19.1
Fisher density
lo
hi
45.0
55.0
Compliance
CPUE change
Equity
lo
med hi
70.0
30.0
declining
static rising
72.6
27.4
lo
hi
41.6
58.4
Fig. 5.8 Network model with Government as the management type
(showing forward propagation of probabilities—if we know the
characteristics of the fishery, we can predict the probability of particular
sustainability outcomes).
 
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