Linking dendritic network structures to population demogenetics : The downside of connectivity

Labonne Jacques, Ravigné Virginie, Parisi Bruno, Gaucherel Cédric. 2008. Linking dendritic network structures to population demogenetics : The downside of connectivity. Oikos, 117 (10) : 1479-1490.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Spatial structures strongly influence ecological processes. Connectivity is known to positively influence metapopulation demography and genetics by increasing the rescue effect and thus favoring individual and gene flow between populations. This result has not been tested in the special case of dendritic networks, which encompass stream and cave ecosystem for instance. We propose a first approach using an individual based model to explore the population demography and genetics in various dendritic networks. To do so, we first generate a large number of different networks, and we analyze the relationship between their hydrographical characteristics and connectivity. We show that connectivity mean and variance of connectivity are strongly correlated in dendritic networks. Connectivity segregates two types of networks: Hortonian and non-Hortonian networks. We then simulate the population dynamics for a simple life cycle in each of the generated networks, and we analyze persistence time as well as populations structure at quasi-stationary state. Our main results show that connectivity in dendritic networks can promote local extinction and genetic isolation by distance at low dispersal and diminish the size of the metapopulation at high dispersal. We discuss these unexpected findings in the light of connectivity spatial distribution in dendritic networks in the case of our model.

Mots-clés Agrovoc : modèle mathématique, écologie, analyse de réseau, flux de gènes, génétique des populations, dynamique des populations

Classification Agris : U10 - Informatique, mathématiques et statistiques
U30 - Méthodes de recherche
F40 - Écologie végétale

Champ stratégique Cirad : Axe 6 (2005-2013) - Agriculture, environnement, nature et sociétés

Auteurs et affiliations

• Labonne Jacques, INRA (FRA)
• Ravigné Virginie, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-4252-2574
• Parisi Bruno, INRA (FRA)
• Gaucherel Cédric, INRA (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/546651/)

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