Ecological Succession – Class 12 | Chapter – 14| Biology Short Notes Series PDF

Ecological Succession: Ecological succession is the gradual process of change in the species composition of a biological community over time. It is a natural process that occurs in all ecosystems, including forests, deserts, lakes, and even cities. Ecological succession is an important process that helps to restore ecosystems and maintain biodiversity. Understanding the dynamics of succession can also help in the management and restoration of disturbed ecosystems, such as those affected by natural disasters, pollution, or human activities.

Types of Ecological Succession

There are two main types of ecological succession:

  • Primary succession: This occurs in a previously uncolonized area, such as a newly formed volcanic island or a sand dune that has just stabilized. The first species to colonize the area are called pioneer species, and they help to create new habitats for other species to colonize over time.

  • Secondary succession: This occurs in an area that has been disturbed, but still contains some remaining vegetation and soil. Secondary succession is usually faster than primary succession because the soil and nutrients are already in place, and the pioneer species can quickly establish themselves.

In both primary and secondary succession, the composition of species changes over time, until the ecosystem reaches a stable state known as the climax community. This is a self-sustaining community of species that have reached a balance with each other and their physical environment.

Seral Community

A seral community is a stage in the process of ecological succession, in which the species composition of an ecosystem is changing over time. Seral communities are intermediate stages between the initial colonization of an area and the eventual establishment of a stable, mature ecosystem known as the climax community.

Seral communities are characterized by the presence of early-succession or pioneer species, which are usually adapted to colonize disturbed or newly created habitats. These species help to create the conditions necessary for the establishment of later-succession species, which in turn create further changes in the ecosystem.

Seral communities can be found in a variety of habitats, including forests, grasslands, wetlands, and deserts. They are important for the maintenance of biodiversity, as they provide habitat and resources for a wide range of species, including those that are rare or endangered.

In managed landscapes, the creation and maintenance of seral communities can be used as a tool for ecological restoration, to help restore degraded ecosystems to their natural state. By understanding the dynamics of seral communities, land managers can help to promote the recovery of ecosystem services and the preservation of biodiversity.

Types of Seral Community

Types of Seres Explanation
Hydrosere Succession in aquatic habitat.
Xerosere Succession in dry habitat.
Lithosere Succession on a bare rock surface.
Psammosere Succession initiating on sandy areas.
Halosere Succession starting in saline soil or water.
Senile Succession of microorganism on dead matter.
Eosere Development of vegetation in an era.

 


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