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Related Experiment Videos

Evidence for the enemy release hypothesis in Hypericum perforatum.

Montserrat Vilà1, John L Maron, Laia Marco

  • 1Centre de Recerca Ecològica i Aplicacions Forestals, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain. montse.vila@uab.es

Oecologia
|January 19, 2005
PubMed
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The enemy release hypothesis (ERH) suggests invaders succeed due to fewer natural enemies. This study on St. John's Wort found less herbivory in introduced ranges, but not larger plants, challenging the ERH.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Invasive Species Biology

Background:

  • The enemy release hypothesis (ERH) is a cornerstone of biological control theory.
  • ERH predicts invasive species thrive by escaping natural enemies in their native range.

Purpose of the Study:

  • To test the ERH prediction by comparing herbivore pressure on native European and introduced North American populations of Hypericum perforatum (St John's Wort).

Main Methods:

  • Comparative analysis of herbivore damage and mortality between native and introduced populations.
  • Assessment of plant density, size, and insect herbivory impacts.

Main Results:

  • Introduced Hypericum perforatum populations exhibited higher densities and reduced herbivore damage and mortality compared to native populations.

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  • Despite reduced herbivory, introduced plants were smaller on average, and overall population size did not differ significantly between ranges.

    • Conclusions:

    • While reduced herbivory may contribute to denser invasive populations, it does not necessarily lead to larger plant size as predicted by the ERH.
    • The findings suggest a more complex interaction of factors influencing invasive species success beyond enemy release.