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Native bush lupines facilitate exotic plant invasions in California coastal prairies by enriching soil nitrogen and creating open, nutrient-rich sites after death. This process reduces native plant diversity and promotes weedy species establishment.

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Area of Science:

  • Ecology
  • Plant Community Dynamics
  • Invasive Species Biology

Background:

  • Exotic plant invasions often occur in disturbed habitats.
  • Native nitrogen-fixing plants can influence invasion dynamics.
  • Bush lupine (Lupinus arboreus) is a native shrub in California coastal prairies.

Purpose of the Study:

  • To investigate how bush lupine facilitates exotic plant invasion in coastal prairies.
  • To determine the role of lupine death and soil nitrogen enrichment in community composition.
  • To compare plant communities in areas with and without recent lupine activity.

Main Methods:

  • Examined nutrient dynamics and plant community characteristics in lupine-colonized sites.
  • Compared recently dead lupine patches with adjacent lupine-free areas.
  • Experimentally killed lupines to assess soil nitrogen and plant growth responses.
  • Grew introduced grass (Bromus diandrus) in soils from lupine-affected and unaffected areas.

Main Results:

  • Experimentally killed lupine patches showed higher soil ammonium and nitrate levels.
  • Bromus diandrus exhibited significantly greater root and shoot biomass in soil from dead lupine patches.
  • Dead lupine patches had higher total above-ground biomass but significantly lower plant species richness and native species abundance.

Conclusions:

  • Bush lupine's life cycle (growth, death, nitrogen enrichment) creates conditions favorable for invasive species.
  • Repeated lupine die-offs can lead to a shift from diverse native communities to less diverse, weedy grasslands.
  • Understanding these native plant-mediated invasion pathways is crucial for coastal prairie conservation.