Skip to Main content Skip to Navigation
Journal articles

Its all about connections: hubs and invasion in habitat networks

Thibaut Morel-Journel 1 Claire Rais Assa 1 Ludovic Mailleret 1, 2, 3 Elodie Vercken 1 
2 BIOCORE - Biological control of artificial ecosystems
CRISAM - Inria Sophia Antipolis - Méditerranée , INRA - Institut National de la Recherche Agronomique, LOV - Laboratoire d'océanographie de Villefranche
Abstract : 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 characterised 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.
Document type :
Journal articles
Complete list of metadata

Cited literature [76 references]  Display  Hide  Download
Contributor : Jean-Luc Gouzé Connect in order to contact the contributor
Submitted on : Monday, December 17, 2018 - 10:08:23 AM
Last modification on : Tuesday, June 7, 2022 - 3:06:04 PM
Long-term archiving on: : Monday, March 18, 2019 - 1:38:24 PM


Files produced by the author(s)



Thibaut Morel-Journel, Claire Rais Assa, Ludovic Mailleret, Elodie Vercken. Its all about connections: hubs and invasion in habitat networks. Ecology Letters, Wiley, 2019, 22 (2), pp.313-321. ⟨10.1111/ele.13192⟩. ⟨hal-01957100⟩



Record views


Files downloads