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Ecosystem models for management advice: An analysis of recreational and commercial fisheries policies in Baja California Sur, Mexico

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  • Cisneros-Montemayor, Andrés M.
  • Christensen, Villy
  • Arreguín-Sánchez, Francisco
  • Sumaila, U. Rashid

Abstract

Recreational fishing is a vital component of the tourism economy in Baja California Sur (BCS), Mexico, although several artisanal and industrial fisheries continue to operate in the region. The commercial long-liner fleet in particular is widely held to be responsible both for diminishing shark populations and declines in billfish through bycatch. Using available fisheries and ecosystem data, we develop an Ecopath with Ecosim (EwE) model to represent current ecosystem and fishing dynamics in BCS and explore the ecological and economic effects of specific fisheries policy measures. Results suggest that currently mandated bycatch limits for the longlining fleet will have little effect on marlin abundance in the area. In an overfished ecosystem, decreasing fishing effort can result in higher overall catches through population rebuilding. While perhaps ecologically justified, increases in the abundance of sharks, a top predator, can have negative effects on other valued species in the ecosystem. The effects of these trophic dynamics must not be overlooked, as they can negate or even reverse desired outcomes from fisheries management.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:ecomod:v:228:y:2012:i:c:p:8-16
    DOI: 10.1016/j.ecolmodel.2011.12.021
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    References listed on IDEAS

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    1. Piroddi, Chiara & Giovanni, Bearzi & Villy, Christensen, 2010. "Effects of local fisheries and ocean productivity on the northeastern Ionian Sea ecosystem," Ecological Modelling, Elsevier, vol. 221(11), pages 1526-1544.
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    3. U. Sumaila & A. Marsden & Reg Watson & Daniel Pauly, 2007. "A Global Ex-vessel Fish Price Database: Construction and Applications," Journal of Bioeconomics, Springer, vol. 9(1), pages 39-51, April.
    4. Ransom A. Myers & Boris Worm, 2003. "Rapid worldwide depletion of predatory fish communities," Nature, Nature, vol. 423(6937), pages 280-283, May.
    5. Andrés Cisneros-Montemayor & U. Sumaila, 2010. "A global estimate of benefits from ecosystem-based marine recreation: potential impacts and implications for management," Journal of Bioeconomics, Springer, vol. 12(3), pages 245-268, October.
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    Cited by:

    1. Steenbeek, Jeroen & Coll, Marta & Gurney, Leigh & Mélin, Frédéric & Hoepffner, Nicolas & Buszowski, Joe & Christensen, Villy, 2013. "Bridging the gap between ecosystem modeling tools and geographic information systems: Driving a food web model with external spatial–temporal data," Ecological Modelling, Elsevier, vol. 263(C), pages 139-151.
    2. Andrés M. Cisneros‐Montemayor & Sarah Harper & Travis C. Tai, 2018. "The market and shadow value of informal fish catch: a framework and application to Panama," Natural Resources Forum, Blackwell Publishing, vol. 42(2), pages 83-92, May.
    3. Deehr, Rebecca A. & Luczkovich, Joseph J. & Hart, Kevin J. & Clough, Lisa M. & Johnson, Beverly J. & Johnson, Jeffrey C., 2014. "Using stable isotope analysis to validate effective trophic levels from Ecopath models of areas closed and open to shrimp trawling in Core Sound, NC, USA," Ecological Modelling, Elsevier, vol. 282(C), pages 1-17.

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