intermediate disturbance hypothesis

The intermediate disturbance hypothesis suggests that species richness is highest in ecosystems with intermediate levels of disturbance. Low disturbance levels allow dominant species to outcompete others, reducing diversity. Conversely, high disturbance levels can prevent community development and eliminate species. Therefore, a balance of disturbance intensity and frequency is proposed to foster the greatest variety of species.1

However, some ecologists question this hypothesis, pointing to difficulties in defining and measuring disturbance. They also argue that species diversity might be overemphasized as a measure of ecosystem recovery, suggesting other metrics like species abundance changes could be more informative.1

Ecological disturbances are events that cause mortality and alter the spatial patterns within ecosystems. These can range from minor events like localized winds and droughts to major ones like volcanic eruptions and human-caused land-use changes. Disturbances play a crucial role in shaping both individual populations and entire ecosystems.1