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Along with this concern for change in various regions has come the need to understand the role of boundaries between these regions and between landscape elements. Much previous ecological research has dealt with processes within relatively homogeneous landscape units or even the collective characteristics of a composite landscape.

One of the most pressing challenges of the 21st century is to develop a means of satisfying the water demands of an expanding human population while at the same time protecting the aquatic ecosystems and ecological services. This title presents key information on sustainable freshwater systems.