April 2016
Intermediate to advanced
548 pages
19h 23m
English
Content preview from Ecological Sustainability
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52 Ecological Sustainability
30
20
10
0
200 40 60
1
1 1 1 1
1
1
1
1 1
1
1
1 1 1 1 1
1
1 1 1
1
1
1
1
3 3 3 3 3
3
3 3 3
3 3
3
2
2
2
2 2
2
4
4
4
4
4
5
5
5
5
5
5
>disp cumher
cumher = 6.043
>
FIGURE 2.11
Results of a simulation of the cod–herring shery when both cod and herring are shed accord-
ing to threshold algorithms. By trial and error, it is possible to adjust both φ
c
and φ
h
to maximize
both cc and ch over 72 months. φ
h
= 4, L
h0
= 5, n
uh
= 0.9, φ
c
= 0.75, L
c0
= 8, n
uc
= 0.85. Traces are as
follows: 1 = x
1
, 2 = x
2
, 3 = fd, 4 = cumcod, 5 = cumher. At t = 72 months, cumher = 6.043. (Multiply
the cumher and cumcod catches by 100 to get true 72-month cumulative catches in thousands
of sh. ...
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