Dispersal Dynamics in Food Webs

Carlos J. Melián, Vlastimil Křivan, Florian Altermatt, Petr Stary, Loïc Pellissier, Frederik De Laender

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Studies of food webs suggest that limited nonrandom dispersal can play an important role in structuring food webs. It is not clear, however, whether density-dependent dispersal fits empirical patterns of food webs better than density-independent dispersal. Here, we study a spatially distributed food web, using a series of population-dispersal models that contrast density-independent and density-dependent dispersal in landscapes where sampled sites are either homogeneously or heterogeneously distributed. These models are fitted to empirical data, allowing us to infer mechanisms that are consistent with the data. Our results show that models with density-dependent dispers al fit the α, β, and γ tritrophic richness observed in empirical data best. Our results also show that density-dependent dispersal leads to a critical distance threshold beyond which site similarity (i.e., β tritrophic richness) starts to decrease much faster. Such a threshold can also be detected in the empirical data. In contrast, models with density-independent dispersal do not predict such a threshold. Moreover, preferential dispersal from more centrally located sites to peripheral sites does not provide a better fit to empirical data when compared with symmetric dispersal between sites. Our results suggest that nonrandom dispersal in heterogeneous landscapes is an important driver that shapes local and regional richness (i.e., α and γ tritrophic richness, respectively) as well as the distance-decay relationship (i.e., β tritrophic richness) in food webs.

langue originaleAnglais
Pages (de - à)157-168
Nombre de pages12
journalThe American Naturalist
Volume185
Numéro de publication2
Les DOIs
Etat de la publicationPublié - 2015

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    • 3 Discours invité
    • 1 Participation à une conférence, un congrès

    Biodiversity, chemicals, and ecosystem functioning. Colloquium of the Institute for Environmental Sciences

    Frédérik De Laender (Orateur invité)

    5 févr. 2015

    Activité: Types de discours ou de présentationDiscours invité

    Biodiversity, chemicals, and ecosystem functioning

    Frédérik De Laender (Orateur invité)

    21 oct. 2014

    Activité: Types de discours ou de présentationDiscours invité

    Biodiversity models for the risk assessment of pesticides

    Frédérik De Laender (Orateur invité)

    10 août 2014

    Activité: Types de discours ou de présentationDiscours invité

    Ensembles de données

    Data from: Dispersal dynamics in food webs

    Altermatt, F. (Contributeur), DE LAENDER, F. (Contributeur), Křivan, V. (Contributeur), Melián, C. J. (Contributeur), Pellissier, L. (Contributeur) & Starý, P. (Contributeur), Dryad Digital Repository, 7 oct. 2014

    Ensemble de données

    Contient cette citation

    Melián, C. J., Křivan, V., Altermatt, F., Stary, P., Pellissier, L., & De Laender, F. (2015). Dispersal Dynamics in Food Webs. The American Naturalist, 185(2), 157-168. https://doi.org/10.1086/679505