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The structure and functioning of eutrophicated aquatic ecosystems
has received considerable attention from limnologists as well as
water managers in recent years. Stress has often been on pelagic
food webs of deeper lakes whilst littoral systems or shallower
lakes have been less thoroughly investigated. Since Dutch aquatic
systems are shallow, as a rule, they form a notable exception. But
here, too, the orientation was often on pelagic food webs. The
present study has a clearly different scope in that it takes the
water plant as prime perspective. The editors consider water plants
to be the key component in shallow aquatic ecosystems. They have
compiled work on one water plant species, Potamogeton pectinatus
L., and from one lake, Lake Veluwe, as a typical case, and set out
to explain the fluctuations in abundance of this water plant as
influenced by eutrophication. A working hypothesis on the mechanism
responsible for water plant decline during eutrophication was
adopted and tested in a combination of field and laboratory work. A
simulation model, SAGAI, for the water plant P.pectinatus was
developed and proved to fit independent data very well. The work
started out as a joint effort of a single project team in the
Department of Nature Conservation of Wageningen Agricultural
University, but the present volume has benefited considerably from
the inputs of several invited colleagues, as the list of
contributors witnesses. The editors have made an invaluable
contribution to the understanding of shallow aquatic ecosystems and
to their scientifically based and sustainable management.
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