In an
environmental sense:
Succession is the
gradual change in the
species that occupy a given area, with some species invading and becoming more
numerous while others decline and
disappear.
Succession is caused by a change in one or ore
abiotic or
biotic factors that
benefits some species at the expense of others.
Succession is also the gradual
change in
plant life, from
grass to hard wood
forrests. The species tend to follow this kind of succession.