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Despeciation

 * Phenomenon that occurs when local populations (demes) merge and form a new species.

Draft (to add to Nourah's)

Another possible cause for despeciation is increased gene flow and hybridization due to changes in the environment. One of these changes could include the loss of essential nourishment resources for each individual species. An example of this can be seen in the case of the 'limnetic' and 'benthic' species of three-spine stickleback fish (Gasterosteus aculeatus) in Canada's Enos Lake. Morphological and genetic analyses conducted by researchers on a sample of fish dating from 1977 to 2002, found that by 1997 these two species populations had been replaced by a new single species. The new species is a hybrid and shows an intermediate form of the parental genotype. As a result, it is more genetically diverse than the two previous distinct species.