Diversity–Stability: May's Ecological Network Simulator |…

What Diversity–Stability Means

Diversity-stability is a concept that examines how the number of different species (diversity) within an ecological community influences its overall stability and resilience. The diversity-stability paradox suggests that more diverse ecosystems are generally more stable, meaning they can better withstand disturbances without collapsing into chaos.

This idea was first proposed by Robert May in 1972 through a mathematical model that analyzed the dynamics of random networks of interacting species.

Why It Matters

Understanding diversity-stability is crucial for conservation biology and ecosystem management. A more stable ecosystem can better support human needs such as food production, water purification, and climate regulation.

Moreover, the model helps predict how changes in biodiversity might affect ecosystem services and resilience to environmental stressors like climate change.

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May's Model Explained

Robert May’s model uses a random network of interacting species where each species interacts with others based on a probability (connectance) and the strength of these interactions. The model predicts that as the number of species increases, the system becomes more stable up to a certain point, after which it can become unstable.

The key insight is that while increased diversity initially enhances stability, beyond a critical threshold, too much complexity can lead to instability.

Real-World Applications

In practice, the diversity-stability concept has been applied in various ecological studies and conservation efforts. For example, it helps explain why tropical ecosystems tend to be more stable than temperate ones due to their higher biodiversity.

The model also guides policymakers in designing protected areas that maintain a balance between species richness and ecosystem stability.

Frequently asked questions

What does the connectance of an ecological network mean?

Connectance refers to the proportion of all possible interactions among species that actually occur. A higher connectance means more interactions, which can affect the overall stability and dynamics of the ecosystem.

How does self-regulation fit into May's model?

Self-regulation is a mechanism by which individual species control their own population size through feedback loops. In May’s model, it affects how strongly each species interacts with itself, influencing the overall stability of the network.

Can diversity-stability be applied to non-biological systems?

While originally developed for biological ecosystems, the principles behind diversity-stability can be extended to other complex systems such as economic networks or technological infrastructures, where diversity and connectivity play critical roles in stability.

What happens if an ecosystem loses species due to human activities?

Losing species can disrupt the balance of interactions within an ecosystem. Depending on the species lost and their role, it could lead to a decrease in overall stability, making the system more vulnerable to disturbances.

Try it live

Everything above runs in your browser — open Diversity–Stability: May's Ecological Network Simulator and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Diversity–Stability: May's Ecological Network Simulator simulation