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Regime shifts in the Northern Benguela ecosystem: Challenges for management

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  • Heymans, Johanna J.
  • Tomczak, Maciej T.

Abstract

An existing Ecopath with Ecosim model of the Northern Benguela ecosystem for 1956, previously fitted to time series for 50 years, was used to describe the impact that the different pressures (fishing and climate drivers) had on the structure of the ecosystem. Ecological network analysis indices and Integrated Trend Assessment of the input data and model outputs were used to describe the changes in this ecosystem over time. We test the hypothesis that the system has been reorganised over the course of the past 50 years, probably due to the cumulative effects of overfishing and environmental drivers such as the Benguela Niño, showing two large changes, with a transition period between the early 1970s and the early 1980s. The ecosystem has moved into a new stable state and this reorganised system will need a large shift to change with the consequential change not necessarily being back towards the pre-existing system.

Suggested Citation

  • Heymans, Johanna J. & Tomczak, Maciej T., 2016. "Regime shifts in the Northern Benguela ecosystem: Challenges for management," Ecological Modelling, Elsevier, vol. 331(C), pages 151-159.
    • Handle: RePEc:eee:ecomod:v:331:y:2016:i:c:p:151-159
    DOI: 10.1016/j.ecolmodel.2015.10.027
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    References listed on IDEAS

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    1. Maciej T Tomczak & Johanna J Heymans & Johanna Yletyinen & Susa Niiranen & Saskia A Otto & Thorsten Blenckner, 2013. "Ecological Network Indicators of Ecosystem Status and Change in the Baltic Sea," PLOS ONE, Public Library of Science, vol. 8(10), pages 1-11, October.
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    1. Guan, Lisha & Shan, Xiujuan & Jin, Xianshi & Gorfine, Harry & Yang, Tao & Li, Zhongyi, 2020. "Evaluating spatio-temporal dynamics of multiple fisheries-targeted populations simultaneously: A case study of the Bohai Sea ecosystem in China," Ecological Modelling, Elsevier, vol. 422(C).
    2. Fu, Caihong & Travers-Trolet, Morgane & Velez, Laure & Grüss, Arnaud & Bundy, Alida & Shannon, Lynne J. & Fulton, Elizabeth A. & Akoglu, Ekin & Houle, Jennifer E. & Coll, Marta & Verley, Philippe & He, 2018. "Risky business: The combined effects of fishing and changes in primary productivity on fish communities," Ecological Modelling, Elsevier, vol. 368(C), pages 265-276.
    3. Borrett, Stuart R. & Sheble, Laura & Moody, James & Anway, Evan C., 2018. "Bibliometric review of ecological network analysis: 2010–2016," Ecological Modelling, Elsevier, vol. 382(C), pages 63-82.
    4. Heymans, Johanna Jacomina & Coll, Marta & Link, Jason S. & Mackinson, Steven & Steenbeek, Jeroen & Walters, Carl & Christensen, Villy, 2016. "Best practice in Ecopath with Ecosim food-web models for ecosystem-based management," Ecological Modelling, Elsevier, vol. 331(C), pages 173-184.

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