PCI Ecology

Title

When higher carrying capacities lead to faster propagationuse asterix (*) to get italics

Authors

Marjorie Haond, Thibaut Morel-Journel, Eric Lombaert, Elodie Vercken, Ludovic Mailleret & Lionel RoquesPlease use the format "First name initials family name" as in "Marie S. Curie, Niels H. D. Bohr, Albert Einstein, John R. R. Tolkien, Donna T. Strickland"

Year

2018

Picture

Abstract

<p>This preprint has been reviewed and recommended by Peer Community In Ecology (https://dx.doi.org/10.24072/pci.ecology.100004). Finding general patterns in the expansion of natural populations is a major challenge in ecology and invasion biology. Classical spatio-temporal models predict that the carrying capacity (*K*) of the environment should have no influence on the speed (*v*) of an expanding population. We tested the generality of this statement with reaction- diffusion equations, stochastic individual-based models, and microcosms experiments with *Trichogramma chilonis* wasps. We investigated the dependence between *K* and *v* under different assumptions: null model (Fisher-KPP-like assumptions), strong Allee effects, and positive density-dependent dispersal. These approaches led to similar and complementary results. Strong Allee effects, positive density-dependent dispersal and demographic stochasticity in small populations lead to a positive dependence between *K* and *v*. A positive correlation between carrying capacity and propagation speed might be more frequent than previously expected, and be the rule when individuals at the edge of a population range are not able to fully drive the expansion.</p>

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Keywords

Expansion dynamics, Invasion biology, Propagation speed, Density-dependent dispersal, Allee effect, Demographic stochasticity, Experimental microcosms, Small populations, Pushed invasion

Methods that require specific expertise (optional)

NonePlease indicate the methods that may require specialised expertise during the peer review process (use a comma to separate various required expertises).

Thematic fields

Biological invasions, Colonization, Dispersal & Migration, Experimental ecology, Population ecology, Spatial ecology, Metacommunities & Metapopulations, Theoretical ecology

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Submission date

2018-04-25 10:18:48

Recommender

Matthieu Barbier

Reviewers

Yuval Zelnik

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