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Nutrient enrichment (eutrophication) is a major theme in freshwater
ecology. Some themes come and go, but the inevitable release of
phosphorus and nitrogen that ac companies human presence seems to
ensure that eutrophication will not soon become an outmoded subject
of study. Eutrophication raises issues that range from the
pressingly practical problems of phosphorus removal to the very
fundamental ecological questions surrounding biological community
regulation by resource supply. Although it is possible to take a
reductionist approach to some aspects of eutrophication, the study
of eutro phication is fundamentally a branch of ecosystem ecology.
To understand eutrophication in a given setting, one is inevitably
forced to consider physical, chemical, and biological phenomena
together. Thus while eutrophication is the focus of our study of
Lake Dillon, we have assumed that a broad base of lirnnological
information is a prerequisite foundation. Eutrophication of a lake
can be studied strictly from a lirnnological perspective. If so,
the nutrient income of the lake is quantified but the sources are
combined within a black box whose only important feature is total
loading. It is also possible, however, to treat the watershed and
lake as equally important components of a hybrid system. In this
case the nutrient sources must be dissected and their variability
and dependence on key factors such as runoff must be quantified."
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