Geoscience Reference
In-Depth Information
The produce R
i
on the remaining trophic levels is calculated by the formula
"
!
#
1
þ
0
X
j
2
S
i
t
o
R
i
¼ R
i
;
max
1
exp
k
ij
B
j
ð
:
02
D
Þ
B
i
9) is postulated as the dependence Ti
i
¼
s
i
B
x
i
The function Ti
i
(i =2
-
, where
i
˄
i
are functions of the water temperature t
0
ˉ
I
= 0.7
-
0.95. The coef
cients
and
oxygen concentration B
14
:
(
t
i
ð
t
o
Þ
B
14
;
i
;
for B
14
[
s
i
t
o
ð
;
B
14
Þ
¼
t
i
ð
t
o
Þ
B
14
=
B
14
;
i
0
B
14
B
14
;
i
;
for
8
<
h
i
i
t
o
t
1
;
i
;
t
2
;
i
s
for
2
;
t
i
ð
t
o
Þ
¼
h
i
:
s
s
i
a
i
exp
b
i
t
o
t
o
t
1
;
i
;
t
2
;
i
½
ð
Þ
for
62
;
where s =(t
o
t
o
i
)/m
i
, t
1
;
i
, and t
2
;
i
are the lower and upper boundaries of the
temperature zone of adaptation of the i-th trophic level;
t
oo
i
5 t
1
;
i
þ
t
2
;
i
¼ 0
:
;
a
i
;
and m
i
are constant values, selected from the condition of the measurement
data approximation.
In contrast to other hydrobionts, bacteria are characterized by a substantial
dependence of gas exchange on the food concentration. Therefore, the following
relationship is assumed in order to describe T
1
:
b
i
;
;
h
i
1
exp
t
0
1
B
10
t
0
1
B
13
T
1
¼ t
1
B
x
1
;
where t
1
is the expenditure of bacteria on energy exchange per unit biomass;
ˉ
1
is
the indicator of the dependence of expenditures on energy exchange on the amount
of the bacterioplankton biomass; t
0
1
and t
0
1
are indicators of the dependence of
expenditures on energy exchange on the ef
cient concentrations of detritus and
dissolved organic matter, respectively.
For phytoplankton, the losses on respiration are characterized by reduced
assimilation of carbon in photosynthesis. For the Peruvian current these losses
average 74.6 % of assimilated oxygen, which constitutes 1.45 g/cm
2
/day. Deter-
mine the dynamic indicator of mortality Mi
i
based on the assumptions made above
in the form of the dependence Mi
i
= (
ʼ
i
+
ʼ
i
′
B
i
)B
i
, where
ʼ
i
= 0.01
−
0.02;
ʼ
i
′
= 0.1
ʼ
i
.
The H
i
parameter is calculated by the formula Hi
i
=h
i
R
i
.
Among living components, anchovy takes a special place in the model, and for
its description the following three stages have been chosen: grubs, youngsters, and
industrial anchovy. It is assumed that the rate of the transition from the i-th stage to
the j-th one is constant and it takes 1 year for these three stages.
Search WWH ::
Custom Search