|
Résumé :
|
This book is for those whose role it is to restore ponds and shallow lakes which have been damaged by eutrophication. Eutrophication is the addition of more than natural quantities of the compounds of phosphorus and nitrogen that are algal and plant nutrients. It has consequences for the biological communities, which are problems for many groups of people. One such serious problem is a change from clear water, dominated in summer by the larger aquatic plants, to turbid water, dominated for much of the year by a pea-soup of algae, and from which the plants have been lost. Many people concerned with the management of lakes will not need to put in place the techniques described here. Their lakes will not be so seriously affected and may still have clear water, attractive lily fringes and a diverse community of aquatic plants, fish and water birds. Nonetheless perceptive lake managers may learn from this guide about how the complex systems of shallow lakes work and thus become aware of possible threats to lake systems under their care. Some managers will be faced with quite serious problems and we hope that this book will help in their understanding and in finding solutions.
|
