In zoology, intergradation is the way in which two distinct subspecies are connected via areas where populations are found that have the characteristics of both. There are two types of intergradation: Primary intergradation: Occurs in cases were two subspecies are connected via one or more intermediate populations, each of which are in turn interm...
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http://en.wikipedia.org/wiki/Intergradation
the act or process of intergrading or the state of being intergraded. · an evolutionary process by which different species of organisms tend to merge through a series of intermediate stages or grades.
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https://www.infoplease.com/dictionary/intergradation
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