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Biotic resistance to invasion is ubiquitous across ecosystems of the United States

Published on by Evelyn Beaury
Authors: Evelyn M. Beaury, John T. Finn, Jeffrey D. Corbin, Valerie Barr, Bethany A. Bradley. Keywords: invasive species, non-native species, biotic resistance, diversity-invasibility hypothesis, biogeography, conservation, biodiversity, plant ecology. This project contains materials in support of two publications: 1) Beaury, E. M., Finn, J. T., Corbin, J. D., Barr, V., & Bradley, B. A. (2020). Biotic resistance to invasion is ubiquitous across ecosystems of the United States. Ecology letters, 23(3), 476-482. Abstract: The biotic resistance hypothesis predicts that diverse native communities are more resistant to invasion. However, past studies vary in their support for this hypothesis due to an apparent contradiction between experimental studies, which support biotic resistance, and observational studies, which find that native and non-native species richness are positively related at broad scales (small scale studies are more variable). Here, we present a novel analysis of the biotic resistance hypothesis using 24,456 observations of plant richness spanning four community types and seven ecoregions of the United States. Non-native plant occurrence was negatively related to native plant richness across all community types and ecoregions, although the strength of biotic resistance varied across different ecological, anthropogenic, and climatic contexts. Our results strongly support the biotic resistance hypothesis, thus reconciling differences between experimental and observational studies and providing evidence for the shared benefits between invasive species management and native biodiversity conservation. 2) Beaury, E. M., Finn, J. T., Corbin, J.D., & Bradley, B. A. (2021). Habitat covariates do not artificially cause a negative correlation between native and non-native species richness. Ecology letters. In press. Abstract: Muthukrishnan (2021) argues that including predictors of species richness results in a false negative correlation between native and non-native richness. However, reanalysis of data presented in Beaury et al. (2020) shows that the negative effect of native richness is statistically significant whether or not predictors of species richness are included.

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Funding

Graduate Research Fellowship Program (GRFP)Directorate for Education & Human ResourcesFind out more...

National Science Foundation BCS-1560925

Department of Interior Northeast Climate Adaptation Science Center Graduate Fellowship

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