Positive interactions among alpine plants increase with stress

Callaway, Ray and Brooker, Rob and Choler, Philippe and Kikvidze, Zaal (2002) Positive interactions among alpine plants increase with stress. Nature, 417 (6891). pp. 844-848. ISSN 0028-0836

Callaway et al[1]._2002_Nature_positive plant interaction + stress.pdf

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Plants can have positive effects on each other. For example, the accumulation of nutrients, provision of shade, amelioration of disturbance, or protection from herbivores by some species can enhance the performance of neighbouring species. Thus the notion that the distributions and abundances of plant species are independent of other species may be inadequate as a theoretical underpinning for understanding species coexistence and diversity. But there have been no large-scale experiments designed to examine the generality of positive interactions in plant communities and their importance relative to competition. Here we show that the biomass, growth and reproduction of alpine plant species are higher when other plants are nearby. In an experiment conducted in subalpine and alpine plant communities with 115 species in 11 different mountain ranges, we find that competition generally, but not exclusively, dominates interactions at lower elevations where conditions are less physically stressful. In contrast, at high elevations where abiotic stress is high the interactions among plants are predominantly positive. Furthermore, across all high and low sites positive interactions are more important at sites with low temperatures in the early summer, but competition prevails at warmer sites.

Item Type: Article
Subjects: Q Science > Ecology
Divisions: Institutes > 4D Research Institute
Depositing User: Prof. Zaal Kikvidze
Date Deposited: 22 Jan 2014 07:10
Last Modified: 23 Jan 2014 19:27
URI: http://eprints.iliauni.edu.ge/id/eprint/382

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