Competition between biological species in marine environments is affected by the motion of the surrounding fluid. An effective 2D compressibility can arise, for example, from the convergence and divergence of water masses at the depth at which passively traveling photosynthetic organisms are restricted to live. In this report, we seek to quantitatively study genetics under flow. To this end, we couple an off-lattice agent-based simulation of two populations in 1D to a weakly compressible velocity field-first a sine wave and then a shell model of turbulence. We find for both cases that even in a regime where the overall population structure is approximately unaltered, the flow can significantly diminish the effect of a selective advantage on fixation probabilities. We understand this effect in terms of the enhanced survival of organisms born at sources in the flow and the influence of Fisher genetic waves.

Plummer, A., Benzi, R., Nelson, D.r., Toschi, F. (2019). Fixation probabilities in weakly compressible fluid flows. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 116(2), 373-378 [10.1073/pnas.1812829116].

Fixation probabilities in weakly compressible fluid flows

Benzi R.
;
Toschi F.
2019-01-08

Abstract

Competition between biological species in marine environments is affected by the motion of the surrounding fluid. An effective 2D compressibility can arise, for example, from the convergence and divergence of water masses at the depth at which passively traveling photosynthetic organisms are restricted to live. In this report, we seek to quantitatively study genetics under flow. To this end, we couple an off-lattice agent-based simulation of two populations in 1D to a weakly compressible velocity field-first a sine wave and then a shell model of turbulence. We find for both cases that even in a regime where the overall population structure is approximately unaltered, the flow can significantly diminish the effect of a selective advantage on fixation probabilities. We understand this effect in terms of the enhanced survival of organisms born at sources in the flow and the influence of Fisher genetic waves.
8-gen-2019
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/02 - FISICA TEORICA, MODELLI E METODI MATEMATICI
English
Fisher waves; population genetics; selective advantage; stochastic processes; turbulence; Plankton; Probability; Models, Biological; Oceans and Seas; Seawater
Plummer, A., Benzi, R., Nelson, D.r., Toschi, F. (2019). Fixation probabilities in weakly compressible fluid flows. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 116(2), 373-378 [10.1073/pnas.1812829116].
Plummer, A; Benzi, R; Nelson, Dr; Toschi, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/211585
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