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Importance of jumbo squid Dosidicus gigas (Orbigny, 1835) in the pelagic ecosystem of the central Gulf of California

Author

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  • Rosas-Luis, R.
  • Salinas-Zavala, C.A.
  • Koch, V.
  • Luna, P. Del Monte
  • Morales-Zárate, M.V.

Abstract

The Humboldt squid is an important predator in the pelagic ecosystem of the central Gulf of California and the commercial catch of this species has increased over the past decade, probable due to a decrease of several top predators (sharks, large pelagic fish and the marine mammals) and the optimal feeding conditions in this area. Its high abundance and important position in the pelagic food web was quantified through two trophic models of the pelagic ecosystem of the central Gulf of California. Models represented conditions in 1980 and 2002, to document the decadal changes in ecosystem structure and function. The models were composed of 18 functional groups, including marine mammals, birds, fish, mollusks, crustaceans, and primary producers. Model results show direct negative effects on principal prey groups such as myctophids and pelagic red crab and positive effects on sharks, marine mammals and specifically sperm whales. It thus appears that the jumbo squid has an important role in the ecosystem and plays a central part in the overall energy flow as main food item for most top predators, and due to its predation of organisms on lower tropic levels.

Suggested Citation

  • Rosas-Luis, R. & Salinas-Zavala, C.A. & Koch, V. & Luna, P. Del Monte & Morales-Zárate, M.V., 2008. "Importance of jumbo squid Dosidicus gigas (Orbigny, 1835) in the pelagic ecosystem of the central Gulf of California," Ecological Modelling, Elsevier, vol. 218(1), pages 149-161.
    • Handle: RePEc:eee:ecomod:v:218:y:2008:i:1:p:149-161
    DOI: 10.1016/j.ecolmodel.2008.06.036
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    References listed on IDEAS

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    1. Christensen, V. & Pauly, D. (eds.), 1993. "Trophic models of aquatic ecosystems," Monographs, The WorldFish Center, number 8432, April.
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    1. Zepeda-Benitez, Viridiana Y. & Morales-Bojórquez, Enrique & Díaz-Uribe, Juan Gabriel & Nevárez-Martínez, Manuel O. & Hernández-Herrera, Agustín & López-Martínez, Juana, 2017. "Implementation of catch-at-age model for the jumbo squid Dosidicus gigas," Ecological Modelling, Elsevier, vol. 344(C), pages 6-16.
    2. Cisneros-Montemayor, Andrés M. & Christensen, Villy & Arreguín-Sánchez, Francisco & Sumaila, U. Rashid, 2012. "Ecosystem models for management advice: An analysis of recreational and commercial fisheries policies in Baja California Sur, Mexico," Ecological Modelling, Elsevier, vol. 228(C), pages 8-16.
    3. Navia, Andrés Felipe & Cruz-Escalona, Víctor Hugo & Giraldo, Alan & Barausse, Alberto, 2016. "The structure of a marine tropical food web, and its implications for ecosystem-based fisheries management," Ecological Modelling, Elsevier, vol. 328(C), pages 23-33.

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