coordinated stasis
coordinated stasis The idea, proposed in 1992 by Gordon Baird, that certain groups of species remain unaltered for tens of millions of years, then experience an episode of rapid extinction and the formation of new species. This resembles punctuated equilibrium acting at the level of communities and may occur because the species interact so closely they cannot evolve, instead responding to environmental change by moving as a group to a more hospitable location. The fossil record of animals dwelling in ocean-bottom muds in the Silurian to middle Devonian appears to support the idea, but it is not accepted by all palaeontologists.
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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… Companion Species , companion species A term formerly used in the Braun-Blanquetphytosociological scheme to mean ‘indifferent species’. Companion species at the associat… 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… Species Group , Skip to main content
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coordinated stasis