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Related Experiment Videos

A population dynamic model for facultative agamosperms.

Yuu Nakayama1, Hiromi Seno, Hirouyki Matsuda

  • 1Ocean Research Institute, University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo, 164-8639, Japan. yu@ori.u-tokyo.ac.jp

Journal of Theoretical Biology
|June 8, 2002
PubMed
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Facultative apomicts, like Taraxacum, can reproduce sexually or asexually. A population model shows diploids and triploids can coexist if germination rates are moderate and triploids produce sufficient pollen.

Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Plant Reproduction

Background:

  • Facultative apomicts exhibit both sexual and asexual reproduction.
  • Species like Taraxacum include both sexual diploids and triploid facultative apomicts.
  • Triploids can produce seeds without fertilization and also produce viable pollen.

Purpose of the Study:

  • To model gene flow and competition between diploid and triploid plants.
  • To determine conditions for the coexistence of diploids and triploids in facultative apomict populations.
  • To analyze the global behavior of a plant population dynamic system.

Main Methods:

  • Development of a population dynamic model.
  • Analysis of gene flow and reproductive investment (seeds and pollen).

Related Experiment Videos

  • Investigation of the impact of germination rates on population dynamics.

    • Main Results:

    • Diploid or triploid persistence depends on relative germination rates.
    • Competitive exclusion occurs with high germination rates for both types.
    • Coexistence is possible with moderate germination rates and sufficient triploid pollen production.

    Conclusions:

    • Facultative agamospermy allows for complex population dynamics.
    • Coexistence requires specific conditions, including moderate germination and pollen viability.
    • Triploid pollen is crucial for exploiting diploid ovules in coexisting populations.