How frequency and intensity shape diversity-disturbance relationships.

Area of Science:

• Ecology
• Theoretical Ecology
• Community Ecology

Background:

• The relationship between disturbance regimes and species diversity is a cornerstone of ecological research.
• The intermediate disturbance hypothesis (IDH) posits peak diversity at intermediate disturbance levels.
• Empirical studies show varied diversity-disturbance relationships (DDRs), including non-peaked patterns, challenging simple hypotheses.

Purpose of the Study:

• To theoretically unify diverse empirical findings on diversity-disturbance relationships (DDRs).
• To demonstrate how a single ecological model can generate multiple DDR patterns.
• To elucidate the competition-mediated mechanisms driving these relationships.

Main Methods:

• Development of a single, simple theoretical model.
• Analysis of how different aspects of disturbance influence the model's output.
• Investigation of competition as the underlying mechanism.

Main Results:

• The model successfully generates various DDR patterns, including peaked and non-peaked relationships.
• Different facets of disturbance (e.g., frequency, intensity) lead to distinct DDR shapes.
• Competition dynamics were identified as the key mediator of these relationships.

Conclusions:

• A unified theoretical framework can explain previously conflicting empirical results on disturbance and diversity.
• The aspect of disturbance considered is crucial for determining the resulting DDR.
• Understanding competition is essential for predicting the effects of disturbance on species diversity.