As the world enters the new millennium, mankind faces a series ofnew prob lems, many of them created by man himself. These include overpopulation, air and water pollution, global warming, accumulation of greenhouse gases, darnage to the ozone layer and loss of biodiversity. Perhaps these problems were around even earlier in an incipient stage, but they have now assumed global proportions and are uppermost in the minds of all. A natural con sequence is enhanced interest in sciences connected with these problems. Ecology is a field that is immensely useful in understanding many of them. In the...