Anomalous invasion dynamics due to dispersal polymorphism and dispersal–reproduction trade-offs

Keenan, Vincent A and Cornell, Stephen J ORCID: 0000-0001-6026-5236
(2021) Anomalous invasion dynamics due to dispersal polymorphism and dispersal–reproduction trade-offs. Proceedings of the Royal Society B: Biological Sciences, 288 (1942). 20202825 - 20202825.

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<jats:p>Dispersal polymorphism and mutation play significant roles during biological invasions, potentially leading to evolution and complex behaviour such as accelerating or decelerating invasion fronts. However, life-history theory predicts that reproductive fitness—another key determinant of invasion dynamics—may be lower for more dispersive strains. Here, we use a mathematical model to show that unexpected invasion dynamics emerge from the combination of heritable dispersal polymorphism, dispersal-fitness trade-offs, and mutation between strains. We show that the invasion dynamics are determined by the trade-off relationship between dispersal and population growth rates of the constituent strains. We find that invasion dynamics can be ‘anomalous’ (i.e. faster than any of the strains in isolation), but that the ultimate invasion speed is determined by the traits of, at most, two strains. The model is simple but generic, so we expect the predictions to apply to a wide range of ecological, evolutionary, or epidemiological invasions.</jats:p>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 15 Jan 2021 08:55
Last Modified: 22 Feb 2021 16:10
DOI: 10.1098/rspb.2020.2825
Open Access URL: