When are Two Phenological Patterns Different?

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Abstract
The importance of the timing of certain events, such as flowering, germination of seeds, bud break and dispersal, in the lives of many species has long been recognized. In many cases, the phenological patterns of these events have evolved by natural selection. In some cases, hypotheses of adaptation concerning phenological patterns can be formulated. These hypotheses can be tested by observing phenologies only if there is some valid method for determining whether 2 phenological patterns are different. A method is described and 3 natural examples of its use are presented.