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Biogeography: Invasive predators rewire island food webs.

Viorel D Popescu1

  • 1School of Professional Studies and Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY, USA; Center for Environmental Research, University of Bucharest, Bucharest, Romania.

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Invasive American bullfrogs disrupt island ecosystems by altering food webs, displacing native species, and increasing instability. This research reveals hidden ecological impacts beyond simple species loss.

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Area of Science:

  • Ecology
  • Invasive Species Biology
  • Island Biogeography

Background:

  • Island ecosystems are vulnerable to invasive species.
  • Invasive species can significantly alter native food web structures.
  • Understanding food web dynamics is crucial for conservation.

Purpose of the Study:

  • To investigate the impact of invasive American bullfrogs on island food web architecture.
  • To assess how bullfrogs alter species interactions and network properties.
  • To reveal indirect effects of invasive species on ecosystem stability.

Main Methods:

  • Food web analysis using ecological network metrics.
  • Quantification of species roles and network connectance.
  • Comparison of invaded vs. uninvaded island food webs.

Main Results:

  • Invasive bullfrogs displaced native species from central food web positions.
  • Increased network connectance and reduced modularity were observed.
  • Ecosystem destabilization and decoupling from biogeographic patterns occurred.

Conclusions:

  • Invasive American bullfrogs restructure island food webs, leading to ecosystem destabilization.
  • Bullfrog invasion impacts extend beyond direct species loss, affecting network structure.
  • This study highlights the complex ecological consequences of invasive species on islands.