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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/204581
No-take fishery reserves for restoring overexploited deep-sea habitats: the case of the Norway lobster Nephrops norvegicus in the northwestern Mediterranean Sea
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[eng] In September 2017, a no-take fishery reserve was established in the deep waters of the northwestern Mediterranean Sea, specifically focused on recovering the Norway lobster (Nephrops norvegicus) population. The main objective of this Ph.D. thesis is to evaluate the effectiveness of this no-take reserve as a tool for restoring overexploited demersal populations.
In the first study, the biological parameters of the Norway lobster population in the northwestern Mediterranean Sea were updated, providing information about the status of the fishery and the population, which showed signs of overexploitation. To evaluate the effects of the no-take reserve, potential predators of the Norway lobster in the northwest Mediterranean were first identified using genetic markers and stable isotopes. It was confirmed that the size of the marine reserve was adequate by conducting tagging and recapture experiments to describe its spatial ecology and reveal its territorial and solitary behavior. The effectiveness of the reserve was evaluated using a Before-After-Control-Impact (BACI) approach, conducting experimental fishing surveys both inside the reserve and in a control zone where fishing was allowed. Through a non-invasive methodology using Remotely Operated Vehicles (ROVs), the species community and habitat were also monitored. All results indicated signs of Norway lobster recovery within the reserve in terms of abundance, biomass, size structure, and other associated species.
Finally, several configurations of no-take fishery reserve networks were simulated using the spatial planning tool "Marxan". These scenarios included a dynamic management approach to adapt the reserves according to seasonal fluctuations in species and associated costs. The simulation results showed that dynamic scenarios achieved all conservation objectives with a lower opportunity cost than the static network.
Overall, this thesis highlights the potential of spatial management measures to contribute to the recovery and sustainability of fisheries and the conservation of marine ecosystems. Although the Norway lobster population has been used as a case study, the approach can be applied to many other species and help address the global concern over the decline of fish populations.
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VIGO FERNANDEZ, Maria. No-take fishery reserves for restoring overexploited deep-sea habitats: the case of the Norway lobster Nephrops norvegicus in the northwestern Mediterranean Sea. [consulta: 3 de desembre de 2025]. [Disponible a: https://hdl.handle.net/2445/204581]