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ecological succession
the changes in an ecosystem that occur gradually through the colonization of new organisms
primary succession
a type of ecological succession that occurs in an area where no biotic community previously existed, always beginning with barren rock
pioneer species
first species to populate an area during succession; bacteria, moss, lichen, or fungi
lichen
an organism made of a fungus and either algae or autotrophic bacteria that live together in a mutualistic relationship
secondary succession
reestablishment of a damaged ecosystem in an area where the soil was left intact
climax community
stable, mature ecological community with little change in the composition of species