Restoration Ecology
The science and practice of assisting the recovery of ecosystems that have been degraded, damaged, or destroyed.
Definition
Ecological restoration is the process of assisting the recovery of an ecosystem that has been degraded, damaged, or destroyed, with the aim of returning it toward a self-sustaining state resembling its pre-disturbance composition, structure, and function. Restoration ecology is the underlying scientific study of that process.
Scope
This area covers the theory and methods of ecological restoration: the principles that guide recovery of degraded ecosystems, the use of reference conditions and succession, active versus passive approaches, the reintroduction of species and rewilding, restoration across major ecosystem types, and the monitoring of restoration success. It excludes the protection of intact habitat (treated under protected areas) and the genetic management of reintroduced populations in detail (treated under conservation genetics).
Sub-topics
Core questions
- What does it mean to restore an ecosystem, and toward what reference state?
- When is passive recovery sufficient, and when is active intervention needed?
- How can degraded ecosystems and lost species be returned to a landscape?
- How is restoration success defined and measured?
Key concepts
- Ecological restoration
- Reference ecosystem
- Passive versus active restoration
- Ecological succession
- Alternative stable states and thresholds
- Restoration of ecosystem services
Key theories
- Reference ecosystems and recovery targets
- Restoration is guided by reference conditions describing the ecosystem's likely state without degradation, providing targets for composition, structure, and function against which recovery is judged.
- Succession and assisted recovery
- Restoration harnesses or accelerates natural successional processes; where degradation has crossed thresholds, active intervention such as soil repair, planting, and species reintroduction is required to set recovery in motion.
Clinical relevance
Restoration is increasingly central to conservation as the area of degraded land grows and intact habitat shrinks, and it is the basis for global commitments such as large-scale restoration pledges. Evidence that restoration can enhance both biodiversity and ecosystem services, while rarely fully recovering reference conditions, shapes expectations and the case for protecting intact systems first.
History
Restoration practice dates to early prairie plantings associated with Aldo Leopold in the 1930s. It matured into a science from the 1980s with the founding of the Society for Ecological Restoration, the development of restoration journals, and growing engagement with succession and disturbance theory. The 2020s have seen restoration elevated to global policy, including the UN Decade on Ecosystem Restoration.
Debates
- Can restored ecosystems match the originals?
- Meta-analyses show restoration improves biodiversity and ecosystem services but typically does not fully recover reference levels; debate continues over how complete recovery can be and whether restoration may weaken the imperative to protect intact habitat.
Key figures
- Aldo Leopold
- Anthony Bradshaw
- Richard Hobbs
- Truman Young
Related topics
Seminal works
- ser2004
- benayas2009
- primack2014
Frequently asked questions
- What is ecological restoration?
- The practice of helping a degraded, damaged, or destroyed ecosystem recover toward a healthy, self-sustaining state similar to what existed before disturbance. It can range from simply removing the cause of degradation to actively replanting and reintroducing species.
- Can a restored ecosystem fully recover?
- Restoration generally increases biodiversity and ecosystem services, but studies show restored sites often do not fully match undisturbed reference ecosystems, especially in composition. This is a key reason conservationists stress protecting intact habitat in the first place.