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Updated: Jun 23, 2026
08:16
Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
Published on: March 13, 2014
Biodiversity maintenance mechanisms differ between native and novel exotic-dominated communities
Brian J Wilsey1, Terri B Teaschner, Pedram P Daneshgar
1Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. bwilsey@iastate.edu
Ecology Letters
|April 22, 2009
Summary
Exotic species invasions lead to greater diversity decline in grasslands compared to native communities. Different mechanisms drive these declines, with exotic species showing a stronger selection effect impacting biodiversity.
Area of Science:
- Ecology
- Community Ecology
- Invasive Species Biology
Background:
- Native plant communities are increasingly being replaced by exotic-dominated ones.
- Understanding the mechanisms of diversity maintenance and decline is crucial for ecosystem stability.
Purpose of the Study:
- To experimentally compare species diversity decline between exotic and native grassland communities.
- To determine if diversity maintenance mechanisms differ based on species origin (native vs. exotic).
Main Methods:
- Field experiments were conducted using nine-species grassland communities.
- A pool of 40 species was used to establish communities composed entirely of exotic or native species.
- Aboveground biomass and species diversity were measured.
Main Results:
- Aboveground biomass was significantly greater in exotic than native plots, especially in mixtures.
- Species diversity declined more rapidly in exotic communities compared to native communities.
- Diversity decline in exotic communities was linked to a strong selection effect from high-biomass monoculture species, unlike in native communities.
Conclusions:
- The study suggests fundamentally different yielding behaviors between co-evolved native species and naive exotic species.
- Native-exotic status significantly influences the mechanisms of community assembly and diversity maintenance.
- Considering the origin of species is vital for predicting ecosystem responses to invasions.
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