Wetlands occupy some six per cent of the Earth's land surface. They
vary from fens and freshwater marshes to tropical mangroves and
tundra swamps. They perform vital hydrological, chemical and
biological roles and contain unique and diverse forms of wildlife
and habitat. They are disappearing at an alarming rate and are
threatened by both the direct and indirect effects of human
activity. The purpose of this book of especially commissioned
articles is threefold: (a) to explore the occurrence and
composition of wetlands and their physical and biological dynamics;
(b) to consider the impact upon them of agriculture, industry,
urbanisation and recreation; and (c) to examine what steps can be
taken to manage and to preserve their future survival.
General
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