Regime shifts, resilience, and biodiversity in ecosystem management

  • Folke C
  • Carpenter S
  • Walker B
 et al. 
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Large-scale transitions between alternative states in ecosystems are known as regime shifts. Once described as healthy and dominated by various marine predators, the Black Sea ecosystem by the late 20th century had experienced anthropogenic impacts such as heavy fishing, cultural eutrophication, and invasions by alien species. We studied changes related to these "natural experiments" to reveal the mechanisms of regime shifts. Two major shifts were detected, the first related to a depletion of marine predators and the second to an outburst of the alien comb jelly Mnemiopsis leidyi; both shifts were triggered by intense fishing resulting in system-wide trophic cascades. The complex nature of ecosystem responses to human activities calls for more elaborate approaches than currently provided by traditional environmental and fisheries management. This implies challenging existing practices and implementing explanatory models of ecosystem interactions that can better reconcile conservation and ecosystem management ideals.

Author-supplied keywords

  • abstract we review the
  • alternate states
  • complex adaptive
  • ecosystem services
  • ecosystems and the functional
  • envi-
  • evidence of regime shifts
  • in terrestrial and aquatic
  • regime shifts
  • resilience of complex adaptive
  • response diversity
  • ronments in relation to
  • systems

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  • Carl Folke

  • Stephen R. Steve Carpenter

  • Brian Walker

  • Marten Scheffer

  • Thomas Elmqvist

  • Lance Gunderson

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