In a surroundings with no past existence, such as a barren habitat, primary succession takes place. A disruption, such as a wildfire, causes secondary succession in an area that was earlier inhabited. The colonisation of a new habitat that is devoid of creatures and plant life is known as primary succession. Secondary succession is the colonisation of an environment that formerly supported life but was abandoned due to an ecological disturbance; primary succession is the colonisation of an environment that once supported life but was abandoned due to an ecological disturbance. The colonisation of new territory created by lava flows is an example of this.

 Succession

A phrase used to describe a series of incremental changes in the species that makes up a community through time is ecological succession. Ecologists distinguish two types of succession based on where they begin: This is the first time in primary succession that this has happened. living species occupy newly exposed or newly formed rock. When an area that was previously occupied by living beings is destroyed and then re-colonized, this is known as secondary succession.

Primary succession

• When fresh land is developed or bare rock is exposed, primary succession occurs, resulting in a habitat that can be inhabited for the first time.
• Volcanic eruptions, such as those on Hawaii’s Big Island, can cause primary succession. As lava pours into the ocean, new rock is formed. On the Big Island, around 32 acres of land are added each year. During the initial succession period what changes to that land?
• This procedure is repeated several times in a row. However, it’s unclear whether succession always—or even usually—has a stable terminus.

Secondary succession

• A formerly populated land gets re-colonized in secondary succession after a disruption that kills most or all of its people. Secondary succession is a well-known phenomenon in wildfire-ravaged oak and hickory woods. The majority of the vegetation will be destroyed, and animals who are unable to flee the area will perish. On the other side, their nutrients are returned to the ground as ash. Because a disturbed area has already nutrient-rich soil, it can be reconquered considerably faster than primary succession bare rock.
• Tall trees would have characterized the vegetation of an oak and hickory woodland prior to a fire. Their height would have helped them collect sun energy while also shading the soil and other low-lying plants. These trees, on the other hand, do not recover quickly following a fire.  When they are in primary succession, the first colonisers might be categorised as pioneer species.

Causes of succession

Initial Causes

Causes that are to blame for the demise of current habitat. The following reasons contribute to such occurrences: climate factors, biotic factors.

Continuing Causes

Growth in population shifting features of an area are caused by a variety of factors. These are some of them:

• Outside aggregation is avoided by migrating.
• Industrialization and urbanisation have included migration.
• As a retaliatory measure in response to local issues.
• a sense of competition

 Stabilising Cause:

Causes that contribute to community stability. These are some of them:

• The land’s fertility
• The area’s climatic conditions
• Mineral abundance and availability, 

Types of Ecological Succession

 Ecological succession can be divided into two categories:

 Primary Succession

 It is defined as the first stage of an ecosystem’s development, which begins with the formation of a community in an area that was previously uninhabited by living organisms. For example, the formation of certain types of dried lava woods.

Secondary succession

It is defined as a stage in the re-establishment of an ecosystem that existed previously but was devastated by natural disasters such as fire, flood, and so on. The existence of seeds and organic matter of biological community in soil causes this re-establishment. For example, vegetation that was damaged by the flood grows again.

Conclusion

Primary succession is the process by which plants and animals restore a desolate area. Seeds blown by the wind may lodge in fissures on a newly formed volcanic island, for example, once the rock cools. Secondary succession varies from primary succession in that it occurs after a severe disturbance wipes off a portion of a landscape, such as a disastrous flood, wildfire, landslide, lava flow, or human activity (farming, road or building construction, or the like). The existence of seeds and organic matter of biological community in soil causes this re-establishment