KEY CONCEPT Ecological succession is a process of change in the species that make up a community.

Succession 1) to create a community in a previously uninhabited area (nothing was living there before) OR is the sequence of biotic changes that regenerate (repair) a damaged community

There are two types of succession. 1) primary succession — the development of an ecosystem in a previously uninhabited area (nothing lived there before-IT WAS ONLY ROCK!!!!)

Pioneer species- the first organisms that live in a new area Ex: lichen and some mosses break down rock into soil over time 4 1- Bare rock is exposed and lichen and moss break it down to dirt 0-15 yrs 2-Seeds are blown into the area and small shrubs grow 15-80 yrs 3-As soil grows thicker, small trees take root 80-115 yrs 4-Different tree species take root, and replace the old trees 115-200 yrs 3 2 1

2) secondary succession — started after a disaster by the remaining species (soil was left intact) There is already soil! 0-2 yrs 2-18 18-70 70-100

Why do you think secondary succession takes less time than primary succession? Secondary succession starts with soil instead of bare rock.