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Control effort exacerbates invasive-species problem.

Matthew J Rinella1, Bruce D Maxwell, Peter K Fay

  • 1USDA Agricultural Research Service, 243 Fort Keogh Street, Miles City, Montana 53901, USA. matt.rinella@ars.usda.gov

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|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Aggressive invasive species management using herbicides can harm native plants. In grasslands, herbicide application significantly reduced native forb populations, sometimes increasing invader abundance, highlighting risks to native biota.

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Area of Science:

  • Ecology
  • Conservation Biology
  • Environmental Management

Background:

  • Invasive species management often involves aggressive tactics like herbicide use.
  • Balancing invader control with native species protection is a significant challenge for ecosystem managers.
  • The impact of control methods on native biota is a critical, often overlooked, consideration.

Purpose of the Study:

  • To evaluate the long-term effects of aggressive management (herbicide application) on native grassland forbs.
  • To determine if herbicide use for invasive species control negatively impacts native plant populations.
  • To assess the indirect effects of herbicide application on native-invader dynamics.

Main Methods:

  • A 16-year study in a grassland ecosystem.
  • Investigated the effects of one-time herbicide application on native forbs.
  • Manipulated grazing exclusion alongside herbicide treatment.

Main Results:

  • One-time herbicide application led to the extreme rarity of two native forbs for the entire 16-year study.
  • Other native forbs also became rare, particularly when grazing was excluded.
  • Evidence suggests the dominant invader increased in abundance following reductions in native forb populations.

Conclusions:

  • Herbicide applications for invasive species control can be detrimental to native plant communities, even when applied once.
  • Management decisions must carefully weigh the potential damage to native species against the benefits of invader control.
  • The findings serve as a cautionary example for invasive species management in ecosystems where native species are present.