I I nutrient input
7
t~
~
.---1\ phytoplankton
NH4
(diatoms and
non-diatoms)
N0
3
WA
ITER
P04
S102
' - - -
macrophytes
I
"
ulva/eelgrass
-------- ------ ---benthic
I
~
REPO
WA TER
I(
-
I
NH4 ......
"""'N0
3
P0
4
S102
'-------J
INORGANIC
NUTRIENTS
~
diatoms
PRIMARY
PRODUCERS
~
uptake
!
T
I
zooplankton
I
Ll
~
suspension
~
feeders
-
deposit
1
feeders
I
III
CONSUMERS
----i>
transformation
Fig. 3.4. State variables and processes in the ecological model
I BOD-input
7
7I
\I
suspended
detritus
I - -
l- - - - - -
labile
--...
detritus
,
~
......
.....
"'
r
refractory
detritus
III
DETRITUS
+ BACTERIA
-+- regeneration
sediment
surface
(j
o
~
£
tr1
~
"g".
III
g.
::l
§
p..
~
~.
::l
0:1
:g
S".
-<
rtl
~
g.
o
::l
00
\0