Copyright Notice:
This and all associated pages of the limnology textbook are copyright (copyright Roberto
Bertoni 1997).
They may not be copied, mirrored or reproduced in part or in whole without the consent of
the author.
They may not be held in any paper or electronic form - written, stored or copied without
the express consent of the author.
The author can be contacted on: r.bertoni@ise.cnr.it or by fax on : ++39 323 556513