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Human-caused environmental change: impacts on plant diversity and evolution
1Department of Ecology, Evolution, and Behavior, 1987 Upper Buford Circle, University of Minnesota, St. Paul, MN 55108, USA. Tilman@lter.umn.edu
Summary
Human-caused environmental changes threaten plant species extinction by altering conditions beyond their evolutionary limits. These shifts may drive species extinction more than habitat destruction, impacting plant communities globally.
Area of Science:
- Ecology
- Environmental Science
- Evolutionary Biology
Background:
- Human activities are rapidly altering global environmental conditions.
- These changes are creating novel environmental combinations outside the evolutionary experience of many terrestrial plants.
- This phenomenon poses a significant threat to plant biodiversity.
Purpose of the Study:
- To assess the potential for human-caused environmental changes to drive species extinction.
- To explore the mechanisms by which altered environmental constraints impact plant communities.
- To investigate the long-term evolutionary and ecological responses of plant taxa to global change.
Main Methods:
- The study synthesizes existing knowledge on environmental change and plant ecology.
- It analyzes the impact of modified environmental constraints on plant physiology, morphology, and life history.
- It considers factors influencing evolutionary versus community ecology responses.
Main Results:
- Environmental modifications, including soil chemistry, atmospheric CO2, and climate, are projected to exceed plant adaptive capacities.
- These changes are predicted to cause greater species extinction than direct habitat destruction.
- A few 'weedy' species are expected to dominate novel conditions, potentially leading to new species evolution.
Conclusions:
- Altered environmental conditions represent a major driver of future plant species extinction.
- Plant communities will undergo significant shifts, favoring species adapted to novel environments.
- Long-term adaptation may involve evolutionary processes, with the scale of change influencing the balance between ecological and evolutionary responses.