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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 originale | Anglais |
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Pages (de - à) | 157-168 |
Nombre de pages | 12 |
journal | The American Naturalist |
Volume | 185 |
Numéro de publication | 2 |
Les DOIs | |
Etat de la publication | Publié - 2015 |
Empreinte digitale
Examiner les sujets de recherche de « Dispersal Dynamics in Food Webs ». Ensemble, ils forment une empreinte digitale unique.Projets
- 1 Terminé
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Biodiversity, ecosystem functioning and environmental stress
1/01/14 → 31/12/16
Projet: Axe de recherche
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Biodiversity, chemicals, and ecosystem functioning. Colloquium of the Institute for Environmental Sciences
Frédérik De Laender (Orateur invité)
5 févr. 2015Activité: Discours ou présentation › Discours invité
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Biodiversity, chemicals, and ecosystem functioning
Frédérik De Laender (Orateur invité)
21 oct. 2014Activité: Discours ou présentation › Discours invité
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Annual meeting of the Ecological Society of America (ESA)
Frédérik De Laender (Orateur)
10 août 2014Activité: Participation ou organisation d'un événement › Participation à une conférence, un congrès
Ensembles de données
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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
DOI: 10.5061/dryad.06bb5, https://datadryad.org/resource/doi:10.5061/dryad.06bb5 et 4 plus de liens, https://doi.org/10.5061/dryad.06bb5/1, https://doi.org/10.5061/dryad.06bb5/2, https://doi.org/10.5061/dryad.06bb5/3, https://doi.org/10.5061/dryad.06bb5/4 (voir moins)
Ensemble de données