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Community diversity and environmental stability: A re-examination.

¹Egbert Leigh is at the Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Panama.

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|January 15, 2011

Summary

Species persist by specializing to their environment, which is influenced by environmental stability. Understanding ecological specialization and environmental variation is key to predicting extinction risks in populations.

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Area of Science:

Ecology
Evolutionary Biology
Population Dynamics

Background:

Ecological theory suggests species persist through specialization, driven by environmental variation.
Greater species diversity is expected in stabler environments, balancing speciation and extinction.
Competitive overlap is theorized to accelerate population extinction.

Purpose of the Study:

To explore the relationship between ecological specialization, environmental stability, and species coexistence.
To investigate how environmental variation influences a population's susceptibility to extinction.
To bridge theoretical ecological models with empirical extinction data.

Main Methods:

Review of theoretical ecological models on species persistence and competition.
Analysis of empirical data on trade-offs and extinction in small populations.
Exploration of new theoretical frameworks for measuring ecological specialization and environmental stability.

Main Results:

Empirical evidence supports the 'jack of all trades is master of none' principle regarding trade-offs.
Competitive overlap demonstrably hastens population extinction.
Direct measurement of ecological specialization and environmental stability remains challenging.

Conclusions:

Ecological specialization is a key factor in species' ability to avoid competitive exclusion.
Environmental stability influences the level of specialization and thus species diversity.
Further theoretical and empirical research is needed to quantify specialization and stability's impact on extinction risk.