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MENTAL MODEL · M6937

r/K Selection Theory

r/K Selection Theory
TechnicalHigh supportEvolutionary Biology
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

A spectrum of reproductive strategies: r-strategists have high reproduction and low investment, while K-strategists have low reproduction and high investment to compete successfully in stable environments.

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The r/K selection theory is a theory in twentieth-century ecology concerning how organisms trade off the quantity and quality of offspring. It was created by ecologists Robert MacArthur and Edward Wilson based on their research on island biogeography. This theory requires considering traits and natural selection together and is relative and comparative. When discussing survival strategies, specific species are compared. The r-strategy focuses on increasing offspring production at the expense of parental investment and individual competitiveness, so that even if survival rates are low, enough offspring remain to continue the population, i.e., "winning by quantity"; the K-strategy is the opposite: fewer offspring are produced, but they receive as much parental care and protection as possible, maximizing individual competitiveness and survival probability, i.e., "winning by quality" or "quality over quantity"...

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Environmental stability determines the optimal reproductive strategy: unstable/resource-fluctuating environments favor r (high reproduction, low investment), while stable environments near carrying capacity K favor K (low reproduction, high parental care). Essentially, it is a trade-off between "quantity" and "quality," driven by environmental selection pressures.

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Source support: Explicit

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    zh.wikipedia.orghttps://zh.wikipedia.org/wiki/R/K%E9%80%89%E6%8B%A9%E7%90%86%E8%AE%BAZH · Explicit
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