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Jellyfication of marine ecosystems as a likely consequence of overfishing small pelagic fishes: lessons from the Benguela

Citation

Roux, J-P and van der Lingen, CD and Gibbons, MJ and Moroff, NE and Shannon, LJ and Smith, ADM and Cury, PM, Jellyfication of marine ecosystems as a likely consequence of overfishing small pelagic fishes: lessons from the Benguela, Bulletin of Marine Science, 89, (1) pp. 249-284. ISSN 0007-4977 (2013) [Refereed Article]


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Copyright Statement

2013 Rosenstiel School of Marine & Atmospheric Science of the University of Miami

DOI: doi:10.5343/bms.2011.1145

Abstract

Changes in two contrasting ecosystems of the Benguela upwelling region, one dominated at mid-trophic level by jellyfishes (Namibia, northern Benguela ecosystem, where small pelagic fish abundance has been severely depleted) and one still dominated by small pelagic fishes (South Africa, southern Benguela) were compared in an effort to determine ecosystem trajectories under different exploitation regimes. The role of small pelagic fishes (clupeoids) was highlighted in the context of their importance in maintaining interactions in marine ecosystems. In particular, we examined trophic cascades and possible irreversible changes that promote the proliferation of jellyfishes in marine systems. We found that the presence of large populations of small pelagic fishes has a fundamental role in preserving beneficial trophic interactions in these marine ecosystems. The implications of trophic cascades, such as those observed in the northern Benguela, for ecosystem-based management were apparent. In addition, this comparison provides contrasting case studies to inform the development of management scenarios that avoid ecosystem shifts that affect predators and reduce the value of fisheries production.

Item Details

Item Type:Refereed Article
Keywords:abundance, fishery management, fishery production, jellyfish, marine ecosystem, overfishing, pelagic fish, trophic cascade, trophic level
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fisheries Management
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Marine Environments
Author:Smith, ADM (Dr Tony Smith)
ID Code:119552
Year Published:2013
Web of Science® Times Cited:31
Deposited By:Centre for Fisheries and Aquaculture
Deposited On:2017-08-02
Last Modified:2017-09-22
Downloads:0

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