Cognitive Scaffold

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MENTAL MODEL · M3611

Diversity-Stability Paradox

Diversity-Stability Paradox
SystemsHigh supportComplexity Science
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Updated 2026-08-05

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INTRODUCTION

English translation pending.

CORE DEFINITION

A result from theoretical ecology. Robert May's analysis of randomly constructed food-web models showed that increasing the number of species and the strength of their connections destabilizes a system, contradicting the earlier intuition that complexity breeds stability. The reconciliation is that stability requires the right kind of diversity: systems shaped by coevolution, with weak and asymmetric interaction strengths, can absorb disturbance, whereas randomly assembled richness cannot. The key constraint is that the claim concerns randomly assembled networks; observed ecosystems are selected, so the paradox marks a starting point rather than a verdict on diversity itself.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Expansion warning: before adding products, teams, or suppliers for the sake of variety, ask whether the new parts have coevolved with the rest. - Coupling audit: trace how a shock in one node propagates, since connection density, not headcount, drives contagion. - Stability definition: separate resistance to disturbance from speed of recovery before arguing that diversity helps.

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Anchor fast decisions

Adding nodes to a network adds both buffering capacity and transmission paths. When links are set at random, the second effect dominates: each new connection is a channel through which a local shock reaches the rest of the system, so the probability that a perturbation propagates grows faster than the redundancy it provides. Evolved systems avoid this because selection prunes strong links and keeps interactions weak and uneven, so disturbance is absorbed locally instead of amplified globally.

MINIMUM ACTION

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Source support: Explicit

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    ncbi.nlm.nih.govhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC7182201/ZH · Explicit
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