France - The Mediterranean Lagoons
327
45
salinity
30
- - surface
•• •••• bottom
15
0
2.4
nitrate + nitrite
'7
E
~ 1.6
••••• bottom
f\
5. 0.8
•• ~.~
j .••...
..Y
•
••
O~~ ____ ~~~~ __________ ~~ __ ~ __ ~
-
surface
0'6
1
I
'E
phosphate
surface
~ 0 4
/ \
••••• bottom
f'-...
5. 0 ~ / )
... ,....... • . / : . . \ -........... "" 1.-... .
J~!~I
:EO 10
0)
8 algal biomass
~E~ 6
~ID
4
3
2
0
140
~ 100
~
'ro 60
>R.
0
20
~
20
.c
secondary biomass
"' "' .9l 15
'E Q)
0)3 10
~
5
"0
0
JFMAMJJASO
1969
1970
1971
Fig. 13.13. Interannual variations of macrophytic primary production (Chaetomorpha
Unum), secondary production (Corophium insidiosum) and some environmental parameters in Biguglia lagoon, Corsica, over 3 years (1969 - 1971)
13.4 General Conclusion
The following relationships have been examined:
1. Eutrophication and community structure. The example of the Corsican
lagoons prior to their exploitation dearly demonstrates various degrees of natural eutrophication, increasing from the most marine-type
327
45
salinity
30
- - surface
•• •••• bottom
15
0
2.4
nitrate + nitrite
'7
E
~ 1.6
••••• bottom
f\
5. 0.8
•• ~.~
j .••...
..Y
•
••
O~~ ____ ~~~~ __________ ~~ __ ~ __ ~
-
surface
0'6
1
I
'E
phosphate
surface
~ 0 4
/ \
••••• bottom
f'-...
5. 0 ~ / )
... ,....... • . / : . . \ -........... "" 1.-... .
J~!~I
:EO 10
0)
8 algal biomass
~E~ 6
~ID
4
3
2
0
140
~ 100
~
'ro 60
>R.
0
20
~
20
.c
secondary biomass
"' "' .9l 15
'E Q)
0)3 10
~
5
"0
0
JFMAMJJASO
1969
1970
1971
Fig. 13.13. Interannual variations of macrophytic primary production (Chaetomorpha
Unum), secondary production (Corophium insidiosum) and some environmental parameters in Biguglia lagoon, Corsica, over 3 years (1969 - 1971)
13.4 General Conclusion
The following relationships have been examined:
1. Eutrophication and community structure. The example of the Corsican
lagoons prior to their exploitation dearly demonstrates various degrees of natural eutrophication, increasing from the most marine-type