Primary succession is ecological succession that starts with a natural disaster and takes up to 1,000 years to complete, they are very slow changes. It starts with no soil and the pioneer species is lichen. This is how rocks become the climax community called the Deciduous Forest. Secondary succession starts with a disaster that wipes out most biotic life. Then it takes up to 100 years to get to homeostasis. The thing that makes it different from primary succession is that it has fast changes because it already has soil.
This volcano is erupting. This event starts the Primary succession.
Primary succession is ecological change that occurs in essentially lifeless areas.
Lichens are the pioneer species for primary succession. This means that they grow first before any other species. This process takes many years because the Lichen grows without soil. After the fire the soil is one of the only things left. But unlike primary succession, secondary succession happens a lot quicker. The pioneer species for secondary succession is grass.
After the volcano erupted there is only abiotic matter. But Lichens start to grow after a while.
Grass can start to grow after the Lichens start the ecosystem. As more producers grow more consumers come into the ecosystem. The community continues to grow. Small trees grow and more organisms come back to the community. The food web grows as the population of the animals can support more consumers.
Soil allows grass to start growing on the once barren rocks.
Mouse Grass Snake
Bigger consumers follow the smaller ones and the amount of organisms in the ecosystem grows.Taller trees also start appearing. Biodiversity increases as the community advances. The biome has reached its climax community. There are more organisms than ever and tall trees are common. The ecosystem is sustainable because it is at its homeostasis. This is the final stage of ecological succession.
After grass grows small shrubs and small trees sprout up .
The forest is burning down. This marks the start of secondary succession.
Secondary succession is transformation that occurs in areas where a community that previously existed has been removed
The soil is already there so grass starts growing immediately.
Trees and bushes grow back as well. The community grows and more organisms live here.
Tall trees grow. This is a balanced community. There is enough biodiversity and sustainability.
Climax community is a stable ecosystem dominated by a small number of prominent species.