title: Emerging predictable features of replicated biological invasion fronts.
abstract: Biological dispersal shapes species' distribution and affects their coexistence. The spread of organisms governs the dynamics of invasive species, the spread of pathogens, and the shifts in species ranges due to climate or environmental change. Despite its relevance for fundamental ecological processes, however, replicated experimentation on biological dispersal is lacking, and current assessments point at inherent limitations to predictability, even in the simplest ecological settings. In contrast, we show, by replicated experimentation on the spread of the ciliate Tetrahymena sp. in linear landscapes, that information on local unconstrained movement and reproduction allows us to predict reliably the existence and speed of traveling waves of invasion at the macroscopic scale. Furthermore, a theoretical approach introducing demographic stochasticity in the Fisher-Kolmogorov framework of reaction-diffusion processes captures the observed fluctuations in range expansions. Therefore, predictability of the key features of biological dispersal overcomes the inherent biological stochasticity. Our results establish a causal link from the short-term individual level to the long-term, broad-scale population patterns and may be generalized, possibly providing a general predictive framework for biological invasions in natural environments.
authors.affiliation: Laboratory of Ecohydrology, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
authors.forename: Andrea
authors.initials: A
authors.lastname: Giometto
authors.forename: Andrea
authors.initials: A
authors.lastname: Rinaldo
authors.forename: Francesco
authors.initials: F
authors.lastname: Carrara
authors.forename: Florian
authors.initials: F
authors.lastname: Altermatt
mesh_terms: D063147:Animal Distribution; D001412:Bacillus subtilis / Q000378:metabolism; D044822:Biodiversity; D017753:Ecosystem; D058865:Introduced Species; D008954:Models, Biological; D016011:Normal Distribution; D011156:Population Density; D011157:Population Dynamics; D012705:Serratia / Q000378:metabolism; D013269:Stochastic Processes; D013768:Tetrahymena / Q000502:physiology*; D014741:Video Recording
keywords: Fisher wave; colonization; frontiers; microcosm; spatial