 This can reinforce the jaw morphology and given enough time, create new species.Such a process can happen through allopatric speciation, whereby species diverge according to different selection pressures in different geographical areas, or through sympatric speciation, by which new species evolve from a common ancestor while remaining in the same area.In Lake Apoyo in Nicaragua, "Amphilophus zaliosus" and its sister species "Amphilophus citrinellus" display many of the criteria needed for sympatric speciation.