Geoscience Reference
In-Depth Information
Table 1
Definitions of model variables and parameters
Symbol
Definition
Unit
Value
Reference
M
In (mass)
-
14 to 14
T
Time
yr
0-100
X
Spatia1 co-ordinates
m
0-1000
Q
In (predator-prey mass ratio)
-
-
'
(q)
Predator-prey mass preference function
-
-
m
3
n(m, t,
x
)
Mass density
-
yr
1
g(m, t,
x
)
Per capita growth rate
-
yr
1
m
(m, t,
x
)
Per capita mortality rate
-
m
2
yr
1
J(m, t,
x
)
Spatial flux
-
m yr
1
v(t,
x
)
Abiotic velocity
-
K
Growth efficiency
-
0.2
Ware (1978)
m
3
yr
1
A
Volume searched per unit mass
640
Ware (1978)
a
Allometric exponent for search rate
-
0.82
Ware (1978)
b
Allometric exponent for intrinsic mortality rate
-
0.25
Brown et al. (2004)
q
o
Preferred predator-prey mass ratio
-
ln(100)
Daan (1973), Cohen et al. (1993)
2
s
Predator-prey mass ratio variance
-
ln(100)/3
Andersen and Ursin (1977)