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Biodiversity inhibits species' evolutionary responses to changing environments
C de Mazancourt1, E Johnson, T G Barraclough
1Redpath Museum, McGill University, 859 Sherbrooke St. W, Montreal, QC, Canada H3A 2K6. claire.demazancourt@mcgill.ca <claire.demazancourt@mcgill.ca>
Ecology Letters
|February 6, 2008
Summary
Biodiversity can slow down species evolution during global change. Higher species diversity means some species are pre-adapted, limiting evolutionary opportunities for others, favoring abundance shifts over phenotype changes.
Area of Science:
- Ecology
- Evolutionary Biology
- Biodiversity Research
Background:
- The interplay between ecological and evolutionary studies is growing, yet how biodiversity impacts within-species evolutionary dynamics is understudied.
- Understanding species' responses to global change requires integrating ecological and evolutionary perspectives.
Purpose of the Study:
- To investigate the influence of biodiversity on species' evolutionary dynamics under global change.
- To explore how environmental changes in patchy environments affect phenotypic evolution in diverse species assemblages.
Main Methods:
- Utilized a classical model of phenotypic evolution.
- Simulated species in a patchy environment with global change affecting patch conditions.
- Analyzed the impact of species diversity on evolutionary trajectories and species abundances.
Main Results:
- Biodiversity can inhibit species' evolution during global change.
- Increased species presence enhances pre-adaptation, restricting ecological opportunity for evolutionary change in other species.
- Environmental change favored shifts in species abundances over changes in phenotypes within species.
Conclusions:
- Species diversity can exert a buffering effect, potentially explaining niche conservatism.
- Biotic responses to environmental change must consider ecological and evolutionary processes within diverse settings.
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