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Transient dynamics of an altered large marine ecosystem
Frank, K.T.; Petrie, B.; Fisher, J.A.D.; Leggett, W.C. (2011). Transient dynamics of an altered large marine ecosystem. Nature (Lond.) 477(7362): 86-89. https://hdl.handle.net/10.1038/nature10285
In: Nature: International Weekly Journal of Science. Nature Publishing Group: London. ISSN 0028-0836, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Frank, K.T.
  • Petrie, B.
  • Fisher, J.A.D.
  • Leggett, W.C.

Abstract
    Overfishing of large-bodied benthic fishes and their subsequent population collapses on the Scotian Shelf of Canada's east coast(1,2) and elsewhere(3,4) resulted in restructuring of entire food webs now dominated by planktivorous, forage fish species and macroinvertebrates. Despite the imposition of strict management measures in force since the early 1990s, the Scotian Shelf ecosystem has not reverted back to its former structure. Here we provide evidence of the transient nature of this ecosystem and its current return path towards benthic fish species domination. The prolonged duration of the altered food web, and its current recovery, was and is being governed by the oscillatory, runaway consumption dynamics of the forage fish complex. These erupting forage species, which reached biomass levels 900% greater than those prevalent during the pre-collapse years of large benthic predators, are now in decline, having outstripped their zooplankton food supply. This dampening, and the associated reduction in the intensity of predation, was accompanied by lagged increases in species abundances at both lower and higher trophic levels, first witnessed in zooplankton and then in large-bodied predators, all consistent with a return towards the earlier ecosystem structure. We conclude that the reversibility of perturbed ecosystems can occur and that this bodes well for other collapsed fisheries.

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