Hydro-ecological relations in the Delta Waters

As mentioned above aa important question is wh~type of nature w want
to &evelop. Do we wwt open easy grassy areas where geese can forage
and waders can breed, or vast m?.rshy woods with breeding colonies of
rare and threatened birds like the Swonbill Bnd the Bightheron? D?
maybe we prelex a mare patchy landscape with grassland vegetation
alternating with Shrubs and aoadlmds, inhabitated by threat&&
invertebrates, amphihia and reptiles. All these types are possible in
large parts of the nw land. %at will be realized depends on t?ie
choice how to manage nature. To make such choices the following
criteria can be used.
Firstly there are the potentialities of the area that may determine the
choke. It is good to poiat out several elements of this criterion,
like:
* The abiotic enviromental onditions, that may differ from place to
place. On a salty soil, for instance, it is rather easy to develop
a grassland vegetation, but a woodland will nor grow there hefare
the soil is desalinated to a depth of several metres.
* New plant and animal species will have to ~oloaize the new ateas.
?herefore the proportion of the area, its position to the acraal
distribution of the species ~imed at and the presence of suitable
migrating zones are very Impe~tant.
* Ecosystem& must not only be realisable. They must also be
maintainable, especially on the long m.
Another important criterion to formulate the goal for ecosystem
development is the significence of the nev type of nature for nature
conservation. It wfll be clear that the highest priority must be given
to species and commities that are threatened on an internatbnal
scs%e.
A fine1 criterion ia the technical and financial ability to realize the
management that is required.