Hydro-ecological relations in the Delta Waters

4.2 Active biological management
If it is considered desirable to have clear water in the next ten years
too. then "active biological management" could be emplop3.
Furthermore, experience elsewhere (e.g. in the Veluwe lakes) and
computer modemg btdleate tbat Sr is difficult far a lake that is
already in "turbid equilibrium" to be made clear again.
/
transparency
algae
+++i-t+++t+U
/--L +++*M
+
asuatiq plants
++-+tit+
\/
preatory fish
+++CH*H+++++
nUttianfs
'2w00000~
l *&a,
wblteeirih
-----
MOOOWOO~O
aemal state si Vol%asak-%oon lake aystem
autrophic rster
o m mixed agsten
+++c healtay water syseem
- path of influence er flaw of mather
HignEe 10 Schematic representation of ecosystem relatianahips in a
autrophic water body
Bigure 10 shows the most important relationships between the various
components of a lake eeosysfem. Nutrients enhance the growth of algae;
algae are eaten by zouplaakton; zooplankton are eatea. bp whitefish;
+#kitefish are eaten by predatory fish; pre&cory flsh, particularly
pike, requite aquatic plants fot shelter and for breeding, atld the
occurrence of aqnatic plants depends on the transparencg of the water
axid thus also an the absence of algae.