Self-reinforcing impacts of plant invasions change over time

Nature
S G Yelenik, Carla M D'Antonio

Abstract

Returning native species to habitats degraded by biological invasions is a critical conservation goal. A leading hypothesis poses that exotic plant dominance is self-reinforced by impacts on ecosystem processes, leading to persistent stable states. Invaders have been documented to modify fire regimes, alter soil nutrients or shift microbial communities in ways that feed back to benefit themselves over competitors. However, few studies have followed invasions through time to ask whether ecosystem impacts and feedbacks persist. Here we return to woodland sites in Hawai'i Volcanoes National Park that were invaded by exotic C4 grasses in the 1960s, the ecosystem impacts of which were studied intensively in the 1990s. We show that positive feedbacks between exotic grasses and soil nitrogen cycling have broken down, but rather than facilitating native vegetation, the weakening feedbacks facilitate new exotic species. Data from the 1990s showed that exotic grasses increased nitrogen-mineralization rates by two- to fourfold, but were nitrogen-limited. Thus, the impacts of the invader created a positive feedback early in the invasion. We now show that annual net soil nitrogen mineralization has since dropped to pre-invasion levels. In a...Continue Reading

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Citations

Jun 25, 2016·AoB Plants·Rafael Dudeque ZenniGuilherme Sena
Nov 1, 2016·Oecologia·Kerri M Crawford, Tiffany M Knight
Feb 25, 2015·Ecology and Evolution·Stephanie G YelenikCarla M D'Antonio
Jul 8, 2016·Science Advances·Adrian C StierPhillip S Levin
Nov 22, 2013·Nature·Katharine N Suding
May 28, 2019·Frontiers in Plant Science·Xiao-Qi YeFei-Hai Yu
May 2, 2018·Proceedings of the National Academy of Sciences of the United States of America·David B Lindenmayer, Chloe Sato
Jan 1, 2015·Hydrobiologia·John E HavelLee B Kats
Sep 28, 2017·AoB Plants·E Pernilla BrinkmanWim H van der Putten
Aug 12, 2020·Journal of Environmental Management·Gabriella Damasceno, Alessandra Fidelis
Jul 6, 2016·Journal of Environmental Management·Brian C ChaffinCraig R Allen

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