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Roses' no-take marine zone effectiveness and spatiotemporal hake population assessment using GIS tools

AuthorsSala Coromina, Joan
AdvisorRecasens, Laura ; García, José A. ; Cardona, Luis
Issue DateJun-2017
PublisherCSIC - Instituto de Ciencias del Mar (ICM)
Universidad de Barcelona
AbstractMarine protected areas (MPA) have been a management tool implemented both for biodiversity conservation and fisheries sustainability. Proofs for biodiversity conservation are consistent but for fisheries sustainability remain scarce. The establishment of MPA also has social consequences as it is introduced in a particular social context where conflicts might be already occurring. Co-management appears like a solution to involve all stakeholders on MPA management, minimize social conflicts derived from its establishment and therefore enhance its effectiveness. In 2013, Roses (NW Mediterranean, Catalan coast) Hake fishermen decided to establish a no-take area in front of Roses Gulf assolution for Hake catches declining trends observed over the past 25 years. Scientific organizations collaborate with fishermen in management and already demonstrated positive effects on biodiversity and biomass inside the area borders. In the present study we analyse the possible effect of the no-take zone beyond its boundaries and the presence of biomass spillover. Using GIS tools we defined analogous areas to the protected one in order to compare them over time. Data analysed was obtained by merging Vessel Monitoring System (VMS) positioning data with daily landings data in order to have geo-referenced Hake catches. Using this methodology we were able to analyse spatiotemporal Hake population behaviour and no-take zone effectiveness. Our results on hake distributions were consistent with previous studies; juveniles concentrated on the continental shelf whereas adults were found to be spread over the self and the slope. Summer-spring recruitment peak evidences were found whereas adult spawning aggregation behaviour was not recorded in our data. We found a positive spillover effect for Hake juveniles confirming the effectiveness of the no-take zone implementation. However, spillover effect was not strong enough to counteract global population declining trends and therefore more protection time will be needed to disentangle if this effect will reverse the general declining hake population trend
DescriptionTrabajo final presentado por Joan Sala Coromina para el Máster en Oceanografía y Gestión del Medio Marino impartido por el Institut de Ciències del Mar (ICM-CSIC) y la Universitat de Barcelona (UB), realizado bajo la dirección de la Dra. Laura Recasen y del Dr. José Antonio García del Arco del Institut de Ciències del Mar (ICM-CSIC) y del Dr. Lluís Cardona de la Universitat de Barcelona (UB).-- 38 pages, 13 figures, 6 tables, 2 annexes
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