[OANNES Foro] Benguelan current overfished ecosystem gobies transfers "dead-end" resources back into the food chain

[Mario Cabrejos]

      Science 16 July 2010:
      Vol. 329. no. 5989, pp. 333 - 336
      DOI: 10.1126/science.1190708
       

Trophic Structure and Community Stability in an Overfished Ecosystem
Anne C. Utne-Palm,1,* Anne G. V. Salvanes,1 Bronwen Currie,2 Stein Kaartvedt,3,10 Göran E. Nilsson,4 Victoria A. Braithwaite,5,1 Jonathan A. W. Stecyk,4 Matthias Hundt,1 Megan van der Bank,7 Bradley Flynn,7 Guro K. Sandvik,4 Thor A. Klevjer,3 Andrew K. Sweetman,8 Volker Brüchert,9 Karin Pittman,1 Kathleen R. Peard,6 Ida G. Lunde,4 Rønnaug A. U. Strandabø,4 Mark J. Gibbons7 

1 Department of Biology, University of Bergen, Bergen, Norway.
2 National Marine Information and Research Centre, Swakopmund, Namibia.
3 Department of Biology, University of Oslo, Oslo, Norway.
4 Department of Molecular Biosciences, University of Oslo, Oslo, Norway.
5 School of Forest Resources and Department of Biology, Pennsylvania State University, State College, PA, USA.
6 Ministry of Fisheries and Marine Resources, Lüderitz, Namibia.
7 Department of Biodiversity and Conservation Biology, University of the Western Cape, Bellville, South Africa.
8 Norwegian Institute for Water Research (NIVA), Regional Office Bergen, Bergen, Norway.
9 Department of Sciences, Stockholm University, Stockholm, Sweden.
10 King Abdullah University of Science and Technology, Thuwai, Saudi Arabia. 

* To whom correspondence should be addressed. E-mail: anne.palm en bio.uib.no 


Since the collapse of the pelagic fisheries off southwest Africa in the late 1960s, jellyfish biomass has increased and the structure of the Benguelan fish community has shifted, making the bearded goby (Sufflogobius bibarbatus) the new predominant prey species. Despite increased predation pressure and a harsh environment, the gobies are thriving. Here we show that physiological adaptations and antipredator and foraging behaviors underpin the success of these fish. In particular, body-tissue isotope signatures reveal that gobies consume jellyfish and sulphidic diatomaceous mud, transferring "dead-end" resources back into the food chain. 

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