Seminars & Discussions
Week beginning 14 December 2014
Wednesday 17 Dec 14 - 2:15pm
To be confirmed
Friday 19 Dec 14 - 11:30am
Emerging predictable features of replicated biological invasion fronts
Authors: Andrea Giometto, Andrea Rinaldo, Francesco Carrara, and Florian Altermatt
Speaker: Bartlomiej Waclaw
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 themacroscopic 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.
pages 297-301 (2014) pdf version
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