What happens when repeated disturbances occur before an ecosystem has recovered?

When major disturbances occur too frequently or repeatedly before an ecosystem has completed its recovery period, the system may be pushed into the formation of alternative community states.1

This shift occurs because the ecosystem is unable to return to its original, pre-disturbance structure or function. A notable example of this phenomenon is seen in Jamaican coral reefs, which were subjected to persistent human-caused degradation—such as pollution and the overharvesting of herbivorous fish—compounded by a series of intense natural disturbances like hurricanes and disease outbreaks. Because these events occurred in rapid succession, the reefs failed to recover their former coral-dominated state and instead became "fouled" by extensive concentrations of benthic algae, creating a stable but undesirable alternative state.1

Ultimately, the ability of an ecosystem to maintain its normal patterns of nutrient cycling and biomass production following damage is known as ecological resilience. When the frequency of disturbance outpaces this resilience, the ecosystem's capacity to retain its original structure is compromised, often leading to long-term ecological shifts.21