10.5061/DRYAD.1G3GP03
Morel-Journel, Thibaut
Université Catholique de Louvain
Assa, Claire Rais
French National Institute for Agricultural Research
Université Côte d'Azur
Mailleret, Ludovic
French National Institute for Agricultural Research
Université Côte d'Azur
Vercken, Elodie
French National Institute for Agricultural Research
Université Côte d'Azur
Data from: It’s all about connections: hubs and invasion in habitat networks
Dryad
dataset
2019
2019-01-04T13:47:43Z
2019-01-04T13:47:43Z
en
https://doi.org/10.1111/ele.13192
31124 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
During the early stages of invasion, the interaction between the features
of the invaded landscape, notably its spatial structure, and the internal
dynamics of an introduced population, has a crucial impact on
establishment and spread. By approximating introduction areas as networks
of patches linked by dispersal, we characterized their spatial structure
with specific metrics and tested their impact on two essential steps of
the invasion process: establishment and spread. By combining simulations
with experimental introductions of Trichogramma chilonis (Hymenoptera:
Trichogrammatidae) in artificial laboratory microcosms, we demonstrated
that spread was hindered by clusters and accelerated by hubs but was also
affected by small-population mechanisms prevalent for invasions, such as
Allee effects. Establishment was also affected by demographic mechanisms,
in interaction with network metrics. These results highlight the
importance of considering the demography of invaders as well as the
structure of the invaded area to predict the outcome of invasions.
exp_datasetExperimental data obtained from the artificial invasions of T.
chilonis, with the following treatments: L = introduction in lowC
landscapes, HH = introduction in highC landscapes in the hub, HF =
introduction in highC landscapes outside of the hub.Simulation scriptThe R
script used to perform the simulations presented in the main text of the
articleScript.r