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Ecology: Darwin's naturalization hypothesis challenged.

Richard P Duncan1, Peter A Williams

  • 1Ecology and Entomology Group, Soil, Plant and Ecological Sciences Division, PO Box 84, Lincoln University, Canterbury, New Zealand. duncanr@lincoln.ac.nz

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|June 7, 2002
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Introduced plants with native relatives in New Zealand are more likely to become naturalized. This finding challenges Darwin's naturalization hypothesis, suggesting shared traits may aid establishment.

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Area of Science:

  • Ecology
  • Botany
  • Evolutionary Biology

Background:

  • Naturalized plants significantly impact ecosystems and economies.
  • Darwin's naturalization hypothesis posits that introduced species face greater challenges in areas with native, congeneric relatives.
  • This hypothesis suggests competition or increased susceptibility to native pests and diseases hinders establishment.

Purpose of the Study:

  • To test Darwin's naturalization hypothesis using data from New Zealand.
  • To investigate the factors influencing the naturalization success of introduced seed-plant species.

Main Methods:

  • Analysis of a comprehensive list of seed-plant species introduced to New Zealand.
  • Statistical examination of the relationship between the presence of congeneric native species and the naturalization status of introduced species.

Main Results:

  • Contrary to Darwin's hypothesis, introduced species with congeneric relatives were significantly more likely to naturalize.
  • The study found a positive correlation between the presence of native relatives and successful naturalization.

Conclusions:

  • Darwin's naturalization hypothesis may not universally apply, particularly in the New Zealand context.
  • Shared traits between introduced and native congeneric species might pre-adapt them to the new environment, facilitating naturalization.