Evolutionary and Population Dynamics: A Coupled Approach

Details Evolutionary and Population Dynamics: A Coupled Approach Evolutionary and Population Dynamics: A Coupled Approach

2011-08-12

arxiv.org/abs/1108.2604v1

Biology

Quantitative Biology

Populations and Evolution

12 pages, 5 figures

Scientific paper

We study the interplay of population growth and evolutionary dynamics using a stochastic model based on birth and death events. In contrast to the common assumption of an independent population size, evolution can be strongly affected by population dynamics in general. Especially for fast reproducing microbes which are subject to selection, both types of dynamics are often closely intertwined. We illustrate this by considering different growth scenarios. Depending on whether microbes die or stop to reproduce (dormancy), qualitatively different behaviors emerge. For cooperating bacteria, a permanent increase of costly cooperation can occur. Even if not permanent, cooperation can still increase transiently due to demographic fluctuations. We validate our analysis via stochastic simulations and analytic calculations. In particular, we derive a condition for an increase in the level of cooperation.

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