Ecosystems can recover after oil spills through a process called bioremediation. This involves naturally occurring bacteria and other microorganisms breaking down and consuming the oil, which helps to clean up the affected area. Additionally, natural processes such as wave action, evaporation, and dilution can also help to disperse and remove the oil over time. However, the extent of recovery depends on various factors such as the type and amount of oil spilled, the sensitivity of the ecosystem, and the effectiveness of cleanup efforts.