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Facilitative interactions do not wane with warming at high elevations in the Andes.
Lohengrin A Cavieres1, Angela Sierra-Almeida
1ECOBIOSIS, Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile. lcaviere@udec.cl
Oecologia
|April 7, 2012
Summary
Positive interactions in alpine plants are crucial for survival. Warmer conditions did not diminish the vital role of nurse plants, suggesting these beneficial relationships will persist in future climates.
Area of Science:
- Ecology
- Plant Biology
- Climate Change Research
Background:
- Positive species interactions are key to alpine plant community structure and dynamics.
- Environmental stress influences the balance between positive and negative interactions, with positive effects increasing under stress.
- Climate change, particularly rising temperatures, may alter the importance of these interactions.
Purpose of the Study:
- To test the hypothesis that increased temperature decreases the importance of positive interactions for alpine plant survival and growth.
- To investigate the impact of warming on the facilitative effects of nurse cushion plants on a native grass species.
Main Methods:
- Field experiment in Los Andes, Chile, at 3,600 m.a.s.l. using Hordeum comosum and Azorella madreporica.
- Nurse removal and seedling survival experiments conducted under natural and warmer conditions (open-top chambers increasing temperature by 4 °C).
- Assessed survival, biomass, and photochemical efficiency of H. comosum after two growing seasons.
Main Results:
- Nurse removal significantly reduced survival, biomass, and photochemical efficiency of H. comosum, confirming facilitative effects.
- Nurse cushions enhanced seedling survival, even under warmer conditions.
- Warmer conditions only partially offset the negative impacts of nurse removal, indicating sustained facilitative effects.
Conclusions:
- Facilitative interactions are vital for the performance and survival of alpine plant species.
- The beneficial effects of nurse cushions on H. comosum persist under warmer conditions.
- Positive interactions are likely to remain crucial for high-alpine habitats in a warming climate.
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