Evolutionary dynamics in a Lotka–Volterra competition model with impulsive periodic disturbance
2016 (English)In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476, Vol. 39, no 2, 177-188 p.Article in journal (Refereed) Published
In this paper, we develop a theoretical framework to investigate the influence of impulsive periodic disturbance on the evolutionary dynamics of a continuous trait, such as body size, in a general Lotka–Volterra-type competition model. The model is formulated as a system of impulsive differential equations. First, we derive analytically the fitness function of a mutant invading the resident populations when rare in both monomorphic and dimorphic populations. Second, we apply the fitness function to a specific system of asymmetric competition under size-selective harvesting and investigate the conditions for evolutionarily stable strategy and evolutionary branching by means of critical function analysis. Finally, we perform long-term simulation of evolutionary dynamics to demonstrate the emergence of high-level polymorphism. Our analytical results show that large harvesting effort or small impulsive harvesting period inhibits branching, while large impulsive harvesting period promotes branching.
Place, publisher, year, edition, pages
John Wiley & Sons, 2016. Vol. 39, no 2, 177-188 p.
adaptive dynamics, critical function analysis, periodic disturbance, singular strategy, speciation
IdentifiersURN: urn:nbn:se:umu:diva-101199DOI: 10.1002/mma.3467OAI: oai:DiVA.org:umu-101199DiVA: diva2:797722