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Effects of Elevated CO2 on an Artificial Grassland Community: Competition, Invasion and Neighbourhood Growth

J. Stewart and C. Potvin
Functional Ecology
Vol. 10, No. 2 (Apr., 1996), pp. 157-166
DOI: 10.2307/2389839
Stable URL: http://www.jstor.org/stable/2389839
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effects of Elevated CO2 on an Artificial Grassland Community: Competition, Invasion and Neighbourhood Growth
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Abstract

1. We analysed the effect of CO2 enrichment on plant-plant interactions in an artificial community dominated by Trifolium repens and Poa pratensis. Plants were enriched either in open-tops or growth chambers. 2. Our main hypotheses were supported, i.e. elevated CO2 increased the strength and number of plant-plant interactions and Trifolium benefited more than Poa from a high CO2 concentration. However, responses differed depending on whether plants were enriched in open-top or in growth chambers. These differences are discussed regarding possible density dependence. 3. This study emphasizes the importance of invasions in the dynamics of our artificial community. Invasiveness was best predicted by traits pertaining to space acquisition. 4. To provide insights into evolutionary processes, phenotypic plasticity and genetic correlation of individual traits were analysed across environments. Our results suggest that little opportunity had occurred for adaptive plasticity to evolve for most characters.

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