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Chapter 1. ENVIRONMENTAL ASPECTS OF EUTROPHICATION

Introduction

Eutrophication of inland waters ranks as one of the most widespread environmental problems. Symptoms of eutrophication include algal scums and toxins derived from algal blooms, massive infestations of certain aquatic plants, increased incidence of water-related diseases, turbid water, noxious odors and poor tasting water, depletion of dissolved oxygen, and fish kills.

Eutrophication of lakes and reservoirs is the result of processes associated with enrichment with plant nutrients, mainly phosphorus and nitrogen. These nutrients enter lakes and reservoirs both as dissolved solutes and as compounds bound to organic and inorganic particles. Augmented nutrient inputs to inland waters usually result from modifications of watersheds, such as deforestation, agricultural and industrial development and urbanization.

The scientific basis for evaluating the causes and impacts of eutrophication is derived primarily from limnology, the study of the physical, chemical, and biological processes in inland aquatic environments. Limnology has a long and successful tradition of applying scientific knowledge to the management of inland waters. Therefore, training in limnology should be an integral part of the education of those responsible for the management of lakes or reservoirs.

Table of Contents

• Brochure
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• International Year of Forests
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• World Environment Day
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• UNEP Campaign
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