Abstract
In order to approach the major issues of community structure, ecologists break communities down conceptually into smaller units. To understand one particular aspect of community structure — species diversity — it is useful to break communities down first into trophic levels and then into smaller units known as guilds. There are several alternative views of how guilds are structured, of which niche theory is one. In the end, the niche-based view may turn out to be broadly correct, usually wrong, or applicable to some major groups of guilds but not to others. This article examines the current state of the controversy.
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