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Modeling an exploited rocky coastal ecosystem: Bahia Tortugas, Mexico

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  • Morales-Zárate, M.V.
  • Lluch-Cota, S.E.
  • Serviere-Zaragoza, E.
  • del Próo, S. Guzmán

Abstract

A trophic structure model of the rocky coastal ecosystem in Bahia Tortugas, Mexico was constructed using Ecopath software to represent the main biomass flows in the system. Data for the model came from field observations (biomass estimates, stomach contents, and ecological observations for sea snails, abalones, lobster, some demersal finfishes, and macroalgae) carried out through ten field trips from 2006 to 2008. The results provide a snapshot of how the ecosystem operates. The model considers 23 functional groups. The total system throughput was 553t/km2/year, 57% corresponds to internal consumption, 28% to respiration, 14% becomes detritus, and only 1% is removed through commercial fishing. The model suggests that even for exploited populations, predation and competition are heavier stresses than current fishing effort; however, because spiny lobster showed the second highest keystoneness’ index value, increasing fishing pressure on this group could strongly impact the entire ecosystem. We believe that this model has the potential to support management by allowing the exploration of the potential impacts of different fishing decisions at ecosystem level.

Suggested Citation

  • Morales-Zárate, M.V. & Lluch-Cota, S.E. & Serviere-Zaragoza, E. & del Próo, S. Guzmán, 2011. "Modeling an exploited rocky coastal ecosystem: Bahia Tortugas, Mexico," Ecological Modelling, Elsevier, vol. 222(5), pages 1185-1191.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:5:p:1185-1191
    DOI: 10.1016/j.ecolmodel.2010.12.011
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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.
    2. Jarre, A. & Palomares, M.L. & Soriano, M.L. & Sambilay, V.C., Jr. & Pauly, D., 1990. "MAXIMS: a computer program for estimating the food consumption of fishes from diel stomach contents data and population parameters," Monographs, The WorldFish Center, number 11231, April.
    3. Zhang, Yuying & Chen, Yong, 2007. "Modeling and evaluating ecosystem in 1980s and 1990s for American lobster (Homarus americanus) in the Gulf of Maine," Ecological Modelling, Elsevier, vol. 203(3), pages 475-489.
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    1. Morales-Zárate, M.V. & López-Ramírez, J.A. & Salinas-Zavala, C.A., 2021. "Loggerhead marine turtle (Caretta caretta) ecological facts from a trophic relationship model in a hot spot fishery area: Gulf of Ulloa, Mexico," Ecological Modelling, Elsevier, vol. 439(C).

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