Data from: Quantifying \"apparent\" impact and distinguishing impact from invasiveness in multispecies plant invasions

Dean E. Pearson, Yvette K. Ortega, Ozkan Eren & Jose L. Hierro
The quantification of invader impacts remains a major hurdle to understanding and managing invasions. Here, we demonstrate a method for quantifying the community-level impact of multiple plant invaders by applying Parker et al.'s (1999) equation (impact = range x local abundance x per capita effect or per unit effect) using data from 620 survey plots from 31 grasslands across west-central Montana, USA. In testing for interactive effects of multiple invaders on native plant abundance (percent...
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