Predicting geographic invasion patterns based on experimental demography: A comparison of two invasive plants and their native analogs in New England (original) (raw)

Abstract

Background/Question/Methods Invasive species’ geographic distributions are often not at equilibrium in their invasive ranges. Therefore, invasion risk based on current occurrence patterns may lead to biased estimates of the locations at risk of invasion. We took an experimental biogeographical approach to investigating the underlying demographic processes that drive population dynamics across a range of potentially invasible environmental conditions. By linking demographic rates (growth, survival, fecundity) to explanatory environmental variables we obtained a mechanistic basis for determining species range limits. These mechanisms are particularly important for understanding invasive species distributions to improve early detection abilities for species with nonequilibrium distributions. We investigated population dynamics of two invasive species: a monocarpic biennial (Alliaria petiolata; garlic mustard) and a woody shrub (Berberis thunbergii; Japanese barberry) and two native eco...

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