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Adaptation and extinction in experimentally fragmented landscapes.

Sima Fakheran1, Cloé Paul-Victor, Christian Heichinger

  • 1Institute of Evolutionary Biology and Environmental Studies and Zürich-Basel Plant Science Center, University of Zürich, CH-8057 Zürich, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|October 20, 2010
PubMed
Summary
This summary is machine-generated.

Ecological competition and disturbance shape evolution. Frequent disturbance dramatically reduces genetic diversity and favors dispersal traits over competitive traits in Arabidopsis thaliana.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Genetics

Background:

  • Ecological forces like competition and disturbance significantly influence evolutionary paths.
  • These forces often oppose each other, with low disturbance leading to high density and intense competition, while frequent disturbance favors dispersal.

Purpose of the Study:

  • To quantify the phenotypic and molecular genetic responses to competition and disturbance using experimental landscapes.
  • To investigate the impact of varying disturbance regimes on genetic diversity and adaptive traits in Arabidopsis thaliana.

Main Methods:

  • Grew Arabidopsis thaliana in experimental landscapes with varied patch sizes and disturbance frequencies (static vs. dynamic).
  • Quantified changes in phenotypic, genetic, and genotypic diversity after five generations.
  • Utilized genomic research and simulations to analyze selection responses.

Main Results:

  • Dynamic landscapes, characterized by frequent disturbance, led to a dramatic loss of genetic diversity, exceeding expectations from genetic drift.
  • Static landscapes favored strong competitors, with competitive ability linked to growth rate rather than seed mass.
  • Dynamic landscapes strongly selected for increased dispersal ability (inferred from inflorescence height and seed mass).

Conclusions:

  • Frequent disturbance drastically reduces genetic diversity and eliminates highly competitive genotypes.
  • Human-induced increases in landscape disturbance may threaten biodiversity and ecosystem resilience.