What is the Difference Between Autogenic and Allogenic Succession?

Autogenic and allogenic succession are two types of ecological succession that differ based on the factors driving the changes in the ecosystem.

• Autogenic succession is driven by the biotic components of the ecosystem, meaning that living organisms are responsible for the changes occurring in the environment. This type of succession occurs due to endogenous factors and usually involves secondary succession, where living organisms in the community alter soil nutrients, soil pH, and organic matter accumulation. An example of autogenic succession is the accumulation of dead organic matter in the soil, which changes the nutrient composition of the soil.
• Allogenic succession is driven by abiotic components of the ecosystem, such as volcanic eruptions, flooding, forest fires, and human interferences. This type of succession is initiated by exogenous factors and typically involves primary succession, where non-living physical entities are the primary drivers of change. An example of allogenic succession is the development of a salt marsh, where constant exposure to water in the intertidal zone causes the soil to change over time, resulting in sedimentation and nutrient buildup that slowly raises the level of the land.

In summary, the key difference between autogenic and allogenic succession lies in the factors driving the changes in the ecosystem: autogenic succession is driven by living organisms within the ecosystem, while allogenic succession is driven by external, non-living factors.

Comparative Table: Autogenic vs Allogenic Succession

The main difference between autogenic and allogenic succession lies in the factors driving these ecological changes. Here is a table comparing the two types of succession:

In summary, autogenic succession is driven by the interactions of organisms with their environment, while allogenic succession is driven by external factors or abiotic factors.