Autogenic succession

Definition

Ecological succession driven by biotic factors originating within the ecosystem itself, such as organism-mediated changes to soil, microclimate, or resource availability. Distinguished from allogenic succession, which is driven by external abiotic forces. The mechanisms of facilitation (early colonists improve conditions for later arrivals), tolerance (later species withstand conditions created by predecessors), and inhibition (established species resist replacement) all contribute to autogenic patterns. In arthropod communities, autogenic succession is evident when insect detritivores alter leaf litter chemistry and structure, enabling subsequent colonization by predators and parasitoids, or when burrowing arachnids and soil-dwelling beetle larvae modify substrate aeration and organic content, progressively restructuring the belowground community.

Etymology

From Greek auto- (self, same) + -genic (producing, causing), reflecting internally generated change

Example

In a decaying carcass, blow fly larvae (Calliphoridae) generate heat and liquefy tissues through enzymatic activity; these autogenic alterations create anaerobic, nutrient-rich conditions that facilitate colonization by later successional species such as hide beetles (Dermestidae) and predatory rove beetles (Staphylinidae).

Related Terms

• allogenic succession
• ecological succession
• Facilitation
• tolerance
• Inhibition
• Pioneer species
• Climax community

Usage Notes

Use specifically for internally driven change; contrast sharply with allogenic succession (flooding, fire, climate shifts). In entomology, particularly relevant to decomposition ecology, aquatic insect colonization of drying pools, and soil arthropod community assembly. Avoid using for any succession involving external disturbance.