Cognitive Scaffold

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MENTAL MODEL · M4105

The Paradox of the Plankton

The Paradox of the Plankton
TechnicalHigh supportEcology
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Updated 2026-08-01

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INTRODUCTION

English translation pending.

CORE DEFINITION

G. Evelyn Hutchinson framed the paradox: competitive exclusion predicts that the number of coexisting species cannot exceed the number of limiting resources, yet a single lake can hold dozens of phytoplankton species competing for the same light and nutrients. Hutchinson's proposed resolutions include temporal and spatial heterogeneity, frequent disturbance, and predation that repeatedly removes whichever species gains an advantage. Diversity persists only while conditions change fast enough to keep any monopoly from forming.

SCAFFOLDING EFFECT

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- Diversity under turbulence: keep an environment unstable if you want many small players to survive. - Monopoly check: ask whether stability, not talent, is what lets one giant win. - Disturbance design: schedule frequent change to stop any single incumbent from locking in.

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Competitive exclusion only bites when resources stay stable long enough for the best competitor to convert its edge into dominance. In the ocean, light, nutrients, and temperature shift on timescales shorter than the time required to exclude a rival, so the identity of the leading species keeps changing. No species ever reaches monopoly, and coexistence is a byproduct of perpetual disruption rather than of niche differences alone.

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    zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E6%B5%AE%E6%B8%B8%E7%94%9F%E7%89%A9%E6%82%96%E8%AB%96ZH · Explicit
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