Ranking species based on sensitivity to perturbations under non-equilibrium community dynamics |
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| Authors: | Lucas P Medeiros Stefano Allesina Vasilis Dakos George Sugihara Serguei Saavedra |
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| Institution: | 1. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Massachusetts, Cambridge, USA;2. Department of Ecology & Evolution, University of Chicago, Illinois, Chicago, USA;3. Institut des Sciences de l'Evolution de Montpellier, Université de Montpellier, Montpellier, France;4. Scripps Institution of Oceanography, University of California San Diego, California, La Jolla, USA |
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| Abstract: | Managing ecological communities requires fast detection of species that are sensitive to perturbations. Yet, the focus on recovery to equilibrium has prevented us from assessing species responses to perturbations when abundances fluctuate over time. Here, we introduce two data-driven approaches (expected sensitivity and eigenvector rankings) based on the time-varying Jacobian matrix to rank species over time according to their sensitivity to perturbations on abundances. Using several population dynamics models, we demonstrate that we can infer these rankings from time-series data to predict the order of species sensitivities. We find that the most sensitive species are not always the ones with the most rapidly changing or lowest abundance, which are typical criteria used to monitor populations. Finally, using two empirical time series, we show that sensitive species tend to be harder to forecast. Our results suggest that incorporating information on species interactions can improve how we manage communities out of equilibrium. |
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| Keywords: | eigenvector forecasting Jacobian matrix population dynamics species interactions time series |
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