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Published on: August 5, 2020
Do competitors modulate rare plant response to precipitation change?
Jonathan M Levine1, A Kathryn McEachern, Clark Cowan
1Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California 93106, USA. levine@lifesci.ucsb.edu
Ecology
|April 13, 2010
Summary
Climate change impacts plants directly and indirectly through competition. This study found precipitation changes affected rare plants, but competition
Area of Science:
- Ecology
- Climate Change Biology
- Plant Ecology
Background:
- Climate change is expected to directly impact species' traits and indirectly influence them through community interactions.
- Few studies investigate both direct and indirect climate change impacts, particularly how altered competition modifies species' responses.
- Understanding these pathways is crucial as competitive pressures can amplify or dampen direct climate effects.
Purpose of the Study:
- To investigate the direct and indirect effects of altered precipitation regimes on rare annual plant species under varying competitive conditions.
- To determine how changes in rainfall impact population growth rates and how competition mediates these effects.
- To assess the sensitivity of focal species and their competitors to precipitation changes and interspecific competition.
Main Methods:
- Field experiment on the California Channel Islands using rain-out shelters and hand watering to manipulate early, late, and season-long rainfall.
- Assessed population growth rates of three focal rare annual plant species in the presence and absence of dominant competitors.
- Quantified responses to a range of precipitation changes simulating future climate scenarios for the region.
Main Results:
- Drought conditions reduced population growth rates for two of three focal annual species in the absence of competition; increased rainfall had variable benefits.
- Dominant competitors were more sensitive to precipitation changes than focal species, benefiting from increased rainfall and suffering from drought.
- Indirect effects of competition on focal species' precipitation responses were weak, with competitors having little influence on two species due to low sensitivity and high variability.
Conclusions:
- While competitors responded to precipitation changes, their indirect effects on focal species were minimal in this study.
- The sensitivity of focal species to competition and the magnitude of climate-driven shifts in competition determine the strength of indirect effects.
- Future climate change impacts on plant communities may be primarily driven by direct physiological responses rather than altered competitive interactions for these species.
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