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Invasiveness, chimerism and genetic diversity.

Rachel Ben-Shlomo1

  • 1Department of Biology and the Environment, University of Haifa - Oranim, Tivon, Israel.

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Summary

Chimerism, the fusion of different individuals, may explain how invasive species achieve high genetic diversity despite few founders. This genetic fusion provides flexibility and maintains diversity across generations.

Keywords:
anthropogenic invasionchimerismgenetic diversitygenetic varianceintra-organismal genetic heterogeneityinvasiveness

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Ecology

Background:

  • Invasive species adaptation requires broad ecological tolerance, typically linked to high genetic diversity.
  • Paradoxically, invasive populations often originate from few founders, leading to low genetic diversity.
  • Existing theories do not fully explain how invasive species maintain genetic diversity.

Purpose of the Study:

  • To propose chimerism as a mechanism enabling invasive species to achieve high genetic diversity.
  • To explore how chimerism can facilitate adaptation to diverse ecological conditions.
  • To investigate the role of chimerism in maintaining genetic variance in invasive populations.

Main Methods:

  • Conceptual framework based on existing knowledge of chimerism and invasion biology.
  • Analysis of the genetic and fitness implications of chimeric individuals.
  • Theoretical modeling of genetic diversity maintenance in successive generations.

Main Results:

  • Chimerism offers a plausible explanation for high genetic diversity in invasive species with few founders.
  • Fusion of individuals provides genetic flexibility and enhances inclusive fitness.
  • Chimerism can sustain genetic diversity across subsequent generations of invasive populations.

Conclusions:

  • Chimerism is a significant, underappreciated factor in the success of invasive species.
  • This phenomenon allows for rapid adaptation and sustained ecological dominance.
  • Further research into chimerism can illuminate evolutionary processes in both invasive and non-invasive populations.