Ecology and evolution unfold in spatially structured communities, where dispersal links dynamics across scales. Because dispersal is multicausal, identifying general drivers remains challenging. In a coordinated distributed experiment spanning organisms from protozoa to vertebrates, we tested whether two fundamental determinants of local dynamics, top-down and bottom-up control, generally explain active dispersal. We show that both factors consistently increased emigration rates and use metacommunity modelling to highlight consequences on local and regional dynamics.
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The data set and computer code generated and analysed during the current study are available in the Zenodo repository, https://doi.org/10.5281/zenodo.1344579.
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F.A. thanks the Swiss National Science Foundation (grant no. PP00P3_150698). D.B. and S.M. thank the Fonds Wetenschappelijk Onderzoek (grant no. 11T7518N LV). S.J., E.L. and N.S. thank Université Catholique de Louvain (UCL) and Fonds de la Recherche Scientifique (F.R.S.)-FNRS. S.J. acknowledges a ‘MOVE-IN Louvain’ postdoctoral position at UCL. N.S. is Research Associate of F.R.S.-FNRS. D.L. and M.D. thank the Fyssen Foundation for funding. J.D.R. thanks the Research Foundation Flanders (FWO; grant no. FWO14/ASP/075). Fr.P. was financially supported by Swiss National Science Foundation grant no. 31003A_159498. J.C. was supported by an ANR-12-JSV7-0004-01, by the ERA-Net BiodivERsA, with the national funder Office national de l’eau et des milieux aquatiques (Onema), part of the 2012–2013 BiodivERsA call for research proposals and by the French Laboratory of Excellence project TULIP (ANR-10-LABX-41). This work was supported by an Investissements d’avenir programme from the Agence Nationale de la recherche (no. ANR-11-INBS-0001AnaEE-Services). D.L. and J.C. thank A. Trochet and O. Calvez for their valuable input in the experiments involving newts, toads and snakes. D.L. and J.C. thank L. Raymond for providing the butterflies. M.D., A.A. and L.M. are especially grateful to C. Van Gheluwe for running the experiments and to Maryvonne Charrier for providing the D. reticulatum slugs. We thank M. Thomas for valuable input on the statistical analyses. This is publication ISEM 2018-172 of the Institut des Sciences de l'Evolution - Montpellier.