When higher carrying capacities lead to faster propagation

Haond, Marjorie; Morel‐Journel, Thibaut; Lombaert, Éric; Vercken, Elodie; Mailleret, Ludovic; Roques, Lionel

doi:10.1101/307322

Cited by 15 publications

(40 citation statements)

References 64 publications

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“…However, in some cases, expansion is hampered at low density, for instance in the presence of an Allee effect (Roques et al, 2012;Gandhi et al, 2016), or because dispersal is density dependent (Haond et al, 2018). This pattern is consistent with the scenario of a population expanding by sending a few pioneer individuals ahead, who manage to reproduce and send a few descendants even further, and so forth.…”

Section: Loss Of Genetic Diversitysupporting

confidence: 77%

“…This dynamical process is referred to as a pulled expansion wave, because the expansion of the whole population is 'pulled' by the few individuals that are ahead. However, in some cases, expansion is hampered at low density, for instance in the presence of an Allee effect (Roques et al, 2012;Gandhi et al, 2016), or because dispersal is density dependent (Haond et al, 2018). In these cases, the population needs to grow locally before being able to spread and the expansion will be 'pushed' from behind by the high-density core.…”

Section: Loss Of Genetic Diversitymentioning

confidence: 99%

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The implications of rapid eco‐evolutionary processes for biological control ‐ a review

Szűcs

Vercken

Bitume

et al. 2019

Entomologia Exp Applicata

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Novel environmental conditions experienced by introduced species can drive rapid evolution of diverse traits. In turn, rapid evolution, both adaptive and non-adaptive, can influence population size, growth rate, and other important ecological characteristics of populations. In addition, spatial evolutionary processes that arise from a combination of assortative mating between highly dispersive individuals at the expanding edge of populations and altered reproductive rates of those individuals can accelerate expansion speed. Growing experimental evidence shows that the effects of rapid evolution on ecological dynamics can be quite large, and thus it can affect establishment, persistence, and the distribution of populations. We review the experimental and theoretical literature on such eco-evolutionary feedbacks and evaluate the implications of these processes for biological control. Experiments show that evolving populations can establish at higher rates and grow larger than non-evolving populations. However, non-adaptive processes, such as genetic drift and inbreeding depression can also lead to reduced fitness and declines in population size. Spatial evolutionary processes can increase spread rates and change the fitness of individuals at the expansion front. These examples demonstrate the power of eco-evolutionary dynamics and indicate that evolution is likely more important in biocontrol programs than previously realized. We discuss how this knowledge can be used to enhance efficacy of biological control.

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Section: Loss Of Genetic Diversitysupporting

confidence: 77%

Section: Loss Of Genetic Diversitymentioning

confidence: 99%

The implications of rapid eco‐evolutionary processes for biological control ‐ a review

Szűcs

Vercken

Bitume

et al. 2019

Entomologia Exp Applicata

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, it has been suggested that the transition between pulled and pushed fronts could occur due to either growth or dispersal density dependence (Van Saarloos 2003). Several recent studies corroborate this conclusion (Kawasaki et al 2017;Haond et al 2018;Wang et al 2019). In particular, an exact analytical solution for v was obtained in Kawasaki et al 2017 for a linear D(n), which showed the existence of a transition between pulled and pushed waves.…”

Section: Deterministic Dynamics: Pulled and Pushed Frontsmentioning

confidence: 92%

Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth

et al. 2019

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Theory predicts rapid genetic drift during invasions, yet many expanding populations maintain high genetic diversity. We find that genetic drift is dramatically suppressed when dispersal rates increase with the population density because many more migrants from the diverse, high‐density regions arrive at the expansion edge. When density dependence is weak or negative, the effective population size of the front scales only logarithmically with the carrying capacity. The dependence, however, switches to a sublinear power law and then to a linear increase as the density dependence becomes strongly positive. We develop a unified framework revealing that the transitions between different regimes of diversity loss are controlled by a single, universal quantity: the ratio of the expansion velocity to the geometric mean of dispersal and growth rates at expansion edge. Our results suggest that positive density dependence could dramatically alter evolution in expanding populations even when its contribution to the expansion velocity is small.

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“…However, it has been suggested that the transition between pulled and pushed fronts could occur due to either growth or dispersal feedback [56]. Several recent studies corroborate this conclusion [37,57]. In particular, exact analytical solution for v was obtained in Ref.…”

Section: Deterministic Dynamics: Pulled and Pushed Frontsmentioning

confidence: 96%

Genetic drift in range expansions is very sensitive to density feedback in dispersal and growth

Birzu

Matin

Hallatschek

et al. 2019

Preprint

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Theory predicts rapid genetic drift in expanding populations due to the serial founder e↵ect at the expansion front. Yet, many natural populations maintain high genetic diversity in the newly colonized regions. Here, we investigate whether density-dependent dispersal could provide a resolution of this paradox. We find that genetic drift is dramatically suppressed when dispersal rates increase with the population density because many more migrants from the diverse, highdensity regions arrive at the expansion edge. When density-dependence is weak or negative, the e↵ective population size of the front scales only logarithmically with the carrying capacity. The dependence, however, switches to a sublinear power law and then to a linear increase as the density-dependence becomes strongly positive. To understand these results, we introduce a unified framework that predicts how the strength of genetic drift depends on the densitydependence in both dispersal and growth. This theory reveals that the transitions between di↵erent regimes of diversity loss are controlled by a single, universal parameter: the ratio of the expansion velocity to the geometric mean of dispersal and growth rates at expansion edge. Importantly, our results suggest that positive density-dependence could dramatically alter evolution in expanding populations even when its contributions to the expansion velocity is small.

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When higher carrying capacities lead to faster propagation

Cited by 15 publications

References 64 publications

The implications of rapid eco‐evolutionary processes for biological control ‐ a review

The implications of rapid eco‐evolutionary processes for biological control ‐ a review

Genetic drift in range expansions is very sensitive to density dependence in dispersal and growth

Genetic drift in range expansions is very sensitive to density feedback in dispersal and growth

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