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Forecasting unprecedented ecological fluctuations

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  • Samuel R Bray
  • Bo Wang

Abstract

Forecasting ‘Black Swan’ events in ecosystems is an important but challenging task. Many ecosystems display aperiodic fluctuations in species abundance spanning orders of magnitude in scale, which have vast environmental and economic impact. Empirical evidence and theoretical analyses suggest that these dynamics are in a regime where system nonlinearities limit accurate forecasting of unprecedented events due to poor extrapolation of historical data to unsampled states. Leveraging increasingly available long-term high-frequency ecological tracking data, we analyze multiple natural and experimental ecosystems (marine plankton, intertidal mollusks, and deciduous forest), and recover hidden linearity embedded in universal ‘scaling laws’ of species dynamics. We then develop a method using these scaling laws to reduce data dependence in ecological forecasting and accurately predict extreme events beyond the span of historical observations in diverse ecosystems.Author summary: Rare large-amplitude ‘Black Swan’ fluctuation events have significant ecological and economic impact. In this work, we tackle the grand challenge in forecasting critical fluctuations in ecosystems, in particular in data sparse regimes. We take an unconventional approach by bridging the fields of statistical physics and ecological forecasting. We apply theory from avalanche systems (such as earthquakes) to analyze long-term monitoring data from diverse natural ecosystems, including marine plankton, intertidal mollusks, and deciduous forest. These datasets allow us to recover the clean power-law relations, or ‘scaling laws’ in statistical physics terms, in system fluctuations that are ubiquitous across species and communities. Leveraging these scaling laws, we extrapolate rare, extreme dynamics from limited historical data and accurately forecast unprecedented events. Therefore, our results have the potential to maximize data value in ecological forecasting with a broad set of applications.

Suggested Citation

  • Samuel R Bray & Bo Wang, 2020. "Forecasting unprecedented ecological fluctuations," PLOS Computational Biology, Public Library of Science, vol. 16(6), pages 1-17, June.
  • Handle: RePEc:plo:pcbi00:1008021
    DOI: 10.1371/journal.pcbi.1008021
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    References listed on IDEAS

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    3. Masayuki Ushio & Chih-hao Hsieh & Reiji Masuda & Ethan R Deyle & Hao Ye & Chun-Wei Chang & George Sugihara & Michio Kondoh, 2018. "Fluctuating interaction network and time-varying stability of a natural fish community," Nature, Nature, vol. 554(7692), pages 360-363, February.
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