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Fixation probabilities in weakly compressible fluid flows.

Abigail Plummer1, Roberto Benzi2,3, David R Nelson4

  • 1Department of Physics, Harvard University, Cambridge, MA 02138; plummer@g.harvard.edu.

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|December 28, 2018
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Summary
This summary is machine-generated.

Fluid motion in marine environments impacts species competition. This study shows that even minor water flow can significantly reduce the effect of natural selection on genetic fixation probabilities in populations.

Keywords:
Fisher wavespopulation geneticsselective advantagestochastic processesturbulence

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Area of Science:

  • Ecology and Evolutionary Biology
  • Fluid Dynamics
  • Computational Biology

Background:

  • Species competition in marine ecosystems is influenced by fluid dynamics.
  • Photosynthetic organisms are often restricted to specific depths, experiencing water mass convergence and divergence.
  • Understanding how environmental flow affects genetic processes is crucial for ecological modeling.

Purpose of the Study:

  • To quantitatively investigate the impact of fluid flow on genetic dynamics.
  • To analyze how a selective advantage is affected by water motion in a simulated population.
  • To explore the role of fluid flow in genetic fixation probabilities.

Main Methods:

  • Coupled an off-lattice agent-based simulation of two populations in one dimension (1D).
  • Utilized a weakly compressible velocity field, including a sine wave and a shell model of turbulence.
  • Analyzed genetic changes under simulated fluid flow conditions.

Main Results:

  • Fluid flow significantly diminished the effect of selective advantage on fixation probabilities.
  • This effect was observed even when the overall population structure remained largely unaltered.
  • Enhanced survival of organisms at flow sources and Fisher genetic waves contributed to the observed outcomes.

Conclusions:

  • Fluid dynamics can play a critical role in modulating evolutionary processes, specifically genetic drift and selection.
  • The findings highlight the importance of incorporating fluid motion into models of population genetics in aquatic environments.
  • Understanding these interactions is key to predicting species adaptation and distribution in dynamic marine ecosystems.