incumbent replacement An evolutionary mechanism, proposed in 1991 by M. L. Rosenzweig and R. D McCord, according to which a well-adapted species (the incumbent) becomes extinct, due to a chance combination of adverse factors, and its vacated niche is occupied by an invading species population.
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Indifferent Species , indifferent species A species with no real affinity for any particular community, but which is not rare (as an accidental species would be). It is fi… ring species , ring species A group of subspecies that are contiguous along a cline. Members of each population are able to mate successfully with members of adjace… Sibling Species , sibling species Species that are identical in outward appearance or very nearly so. Despite the similarity, however, they qualify as species by being… accidental species , accidental species One of five classes of fidelity used by the Braun-Blanquet school of phytosociology in the description and classification of plant… preferential species , preferential species In phytosociology, a species that is present with varying abundance in several communities, but is especially abundant and vigor… Fugitive Species , fugitive species (opportunist species) A species typical of unstable or periodically extreme environments, e.g. deserts or ephemeral ponds, and chara…
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