Dispersal and the underlying movement behaviour are processes of pivotal importance for understanding and predicting metapopulation and metacommunity dynamics. Generally, dispersal decisions are condition-dependent and rely on information in the broad sense, like the presence of conspecifics. However, studies on metacommunities that include interspecific interactions generally disregard condition-dependence. Therefore, it remains unclear whether and how dispersal in metacommunities is condition-dependent and whether rules derived from single-species contexts can be scaled up to (meta)communities. Using experimental protist metacommunities, we show how dispersal and movement depend on and are adjusted by the strength of interspecific interactions. We found that the predicting movement and dispersal in metacommunities requires knowledge on behavioural responses to intra- and interspecific interaction strengths. Consequently, metacommunity dynamics inferred directly from single-species metapopulations without taking interspecific interactions into account are likely flawed. Our work identifies the significance of condition-dependence for understanding metacommunity dynamics, stability and the coexistence and distribution of species.

Department of Aquatic Ecology Eawag Swiss Federal Institute of Aquatic Science and Technology Überlandstrasse 133 CH 8600 Dübendorf Switzerland Institute of Evolutionary Biology and Environmental Studies University of Zurich Winterthurerstrasse 190 CH 8057 Zürich Switzerland

Department of Fish Ecology and Evolution Eawag Swiss Federal Institute of Aquatic Science and Technology Seestrasse 79 CH 6047 Kastanienbaum Switzerland

Department of Fish Ecology and Evolution Eawag Swiss Federal Institute of Aquatic Science and Technology Seestrasse 79 CH 6047 Kastanienbaum Switzerland Laboratory of Theoretical Ecology Institute of Entomology Biology Centre of the Czech Academy of Sciences České Budějovice Czech Republic

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