origination The first appearance of a new species. Comparing the rate at which new species appear (origination rate) with the rate at which species go extinct (extinction rate) within an ecosystem reveals whether the system was stable (origination = extinction), diversifying (origination > extinction), or losing species (origination < extinction).
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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… preferential species , preferential species In phytosociology, a species that is present with varying abundance in several communities, but is especially abundant and vigor… Centrifugal Speciation , centrifugal speciation The principle that new species are likely to arise towards the centre of the range of the present species, rather than at the… Constant Species , constant species(constancy) In phytosociology, a species common to a particular association or community, but not necessarily confined to that commun… 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… 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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