Our understanding of the ecology of running waters has come a long way during the past few years. From being a largely descriptive subject, with a few under- tones concerned with such things as fisheries, pollution or control of blackflies, it has evolved into a discipline with hypotheses, such as the River Continuum Concept (Vannote et a/. 1980), and even a book suggesting that it offers opportunity for the testing of ecological theory (Barnes &...
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