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‘Sea of exotics’ isolates native plants

U. TORONTO (CAN) — Given time, invading plants will most likely eliminate native species growing in the wild, new research shows.

Previous statements that find invasive plants are not problematic are often based on incomplete information, with insufficient time having passed to observe the full effect of invasions on native biodiversity, according to a study published in Proceedings of the National Academy of Sciences.

“The impacts of exotic plant invasions often take much longer to become evident than previously thought,” says Benjamin Gilbert of the Department of Ecology & Evolutionary Biology at the University of Toronto and lead author of the study. “This delay can create an ‘extinction debt’ in native plant species, meaning that these species are slowly going extinct but the actual extinction event occurs hundreds of years after the initial invasion.”

Much of the debate surrounding the threat posed to biodiversity by the invasions of non-native species is fueled by recent findings that competition from introduced plants has driven remarkably few plant species to extinction. Instead, native plant species in invaded ecosystems are often relegated to patchy, marginal habitats unsuitable to their non-native competitors.

However, Gilbert and co-author Jonathan Levine of ETH Zurich say that it is uncertain whether the colonization and extinction dynamics of the plants in marginal habitats will allow long-term native persistence.

“Of particular concern is the possibility that short term persistence of native flora in invaded habitats masks eventual extinction,” says Levine.

The scientists conducted their research in a California reserve where much of the remaining native plant diversity exists in marginal areas surrounded by invasive grasses. They performed experiments in the reserve and coupled their results with quantitative models to determine the long term impacts of invasive grasses on native plants.

“Invasion has created isolated ‘islands of native plants’ in a sea of exotics,” says Gilbert. “This has decreased the size of native habitats, which reduces seed production and increases local extinction. It also makes it much harder for native plants to recolonize following a local extinction.

“Our research also allows us to identify how new habitats for native flora could be created that would prevent extinction from happening. These habitats would still be too marginal for invaders, but placed in such a way as to create ‘bridges’ to other habitat patches,” says Gilbert.

The research is supported by funding from the Natural Sciences and Engineering Research Council of Canada and the Packard Foundation.

Source: University of Toronto

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  1. Baron Pike

    Invasive plants are obviously from a competitively evolving species, while native plants may over time have evolved to use cooperative strategies to retain stability. To switch to competitive strategies to overcome the effects of the invaders must necessarily result in changing the forms of the native species as well to allow the overall systems to be more competitive.

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