Increasing and fluctuating resource availability enhances invasional meltdown

Yan Sun, Zhi Kun Ren, Heinz Müller-Schärer, Ragan M. Callaway, Mark van Kleunen, Wei Huang

Research output: Contribution to journalArticlepeer-review

Abstract

Exotic plant invaders can promote others via direct or indirect facilitation, known as “invasional meltdown.” Increased soil nutrients can also promote invaders by increasing their competitive impacts, but how this might affect meltdown is unknown. In a mesocosm experiment, we evaluated how eight exotic plant species and eight Eurasian native species responded individually to increasing densities of the invasive plant Conyza canadensis, while varying the supply and fluctuations of nutrients. We found that increasing density of C. canadensis intensified competitive suppression of natives but intensified facilitation of other exotics. Higher and fluctuating nutrients exacerbated the competitive effects on natives and facilitative effects on exotics. Overall, these results show a pronounced advantage of exotics over native target species with increased relative density of C. canadensis under high nutrient availability and fluctuation. We integrate these results with the observation that exotic species commonly drive increases in soil resources to suggest the Resource-driven Invasional Meltdown and Inhibition of Natives hypothesis in which biotic acceleration of resource availability promotes other exotic species over native species, leading to invasional meltdown.

Original languageEnglish
Article numbere4387
JournalEcology
Volume105
Issue number9
DOIs
StatePublished - Jul 17 2024

Keywords

  • Conyza canadensis
  • competition
  • facilitation
  • invasive alien plant species
  • multispecies invasion
  • native plant species

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