What question did this study set out to answer?

To establish a general theoretical relationship between species diversity and community stability that resolves discrepancies among differing ecological models.

April 1, 2002The American Naturalist

General Relationships between Species Diversity and Stability in Competitive Systems

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Authors

AIAnthony R. IvesUniversity of Wisconsin–Madison JHJ.B. HughesThames Water (United Kingdom)

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Implication

Theoretical analysis reveals that species diversity reduces total density fluctuations in competitive communities, indicating that biodiversity buffers ecosystems against environmental instability.

Key Points

To establish a general theoretical relationship between species diversity and community stability that resolves discrepancies among differing ecological models.
Derived a mathematical formulation relating the coefficient of variation (CV) of aggregate species densities to environmentally driven variability in per capita population growth rates.
Evaluated stability across varying levels of species richness in both competitive models and noninteractive models lacking competition.
Increasing the number of species decreases the coefficient of variation of combined species densities, provided that species do not exhibit perfectly correlated responses to environmental fluctuations.
Species-rich communities exhibit greater stability than species-poor communities when species across both systems experience equal variability in per capita growth rates.
The stabilizing relationship applies equivalently to noninteractive ecological systems where species do not compete.

Cite This Study

Ives et al. (2002) studied this question.

synapsesocial.com/papers/6a708396febe604dd7094cd3 https://doi.org/10.1086/338994

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Implication

Theoretical analysis reveals that species diversity reduces total density fluctuations in competitive communities, indicating that biodiversity buffers ecosystems against environmental instability.

General Relationships between Species Diversity and Stability in Competitive Systems

Discussion

Member takes

Implication

Key Points

Cite This Study

General Relationships between Species Diversity and Stability in Competitive Systems

Discussion

Member takes

Implication

Key Points

Cite This Study

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