EXOTIC PLANT SPECIES INVADE HOT SPOTS OF NATIVE PLANT DIVERSITY

@article{Stohlgren1999EXOTICPS,
  title={EXOTIC PLANT SPECIES INVADE HOT SPOTS OF NATIVE PLANT DIVERSITY},
  author={Thomas J. Stohlgren and Dan Binkley and Geneva W. Chong and Mohammed A. Kalkhan and Lisa D. Schell and Kelly A. Bull and Yuka Otsuki and Greg Newman and Michael A. Bashkin and Yowhan Son},
  journal={Ecological Monographs},
  year={1999},
  volume={69},
  pages={25-46}
}
Some theories and experimental studies suggest that areas of low plant spe- cies richness may be invaded more easily than areas of high plant species richness. We gathered nested-scale vegetation data on plant species richness, foliar cover, and frequency from 200 1-m 2 subplots (20 1000-m 2 modified-Whittaker plots) in the Colorado Rockies (USA), and 160 1-m 2 subplots (16 1000-m 2 plots) in the Central Grasslands in Colorado, Wyoming, South Dakota, and Minnesota (USA) to test the generality… 

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Results provide strong evidence for the role of community structure, as affected by disturbance, in determining invasibility of this grassland, and a significant positive relationship between exotic and native species richness was observed within a disturbance regime.

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Assessment of the vulnerability of vegetation types to nonnative plant invasions in the north–central United States concluded that vegetation types rich in native species are often highly vulnerable to invasion by non native plant species.

Abiotic conditions shape the relationship between indigenous and exotic species richness in a montane biodiversity hotspot

The results suggest that biotic resistance is restricted to the lower and mid elevations while biotic acceptance prevails in presence of severe abiotic stress, potentially increasing the risk of plant invasions into montane biodiversity hotspots.
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