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Why can some damaged ecosystems recover naturally after a disturbance ends?
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ecological restoration
Wetland restoration along the Târnava Mică (Tîrnava Mică) River in Romania. A former gravel mine (left) was transformed into a functional wetland (right).
Damaged ecosystems can recover naturally through a process known as secondary succession. This occurs when a disturbance—such as a wildfire, flood, or human activity—alters an environment without rendering it completely lifeless.123
Recovery is possible because the ecosystem retains biological "legacies" that allow the community to rebuild. Key factors include:3
- Soil Seed Banks: Many ecosystems maintain a soil seed bank, a natural repository of seeds stored in the soil or leaf litter. These seeds can remain dormant and sprout once the disturbance passes, often benefiting from reduced competition or shading.41
- Survival of Organisms: If a disturbance is not catastrophic, some plants and animals survive in patches or underground, providing a foundation for recolonization.13
- Adaptation: Some species have evolved to thrive following specific disturbances. For instance, the jack pine requires the heat from a wildfire to open its cones and release seeds for new growth.13
- Ecological Resilience: Ecosystems possess ecological resilience, the ability to maintain or recover their structure and function after damage. This is often supported by species diversity and the ability of organisms from surrounding areas to recolonize the site.51