Interactions Between a Large Marine Protected Area, Pelagic Tuna and Associated Fisheries

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dc.contributor.authorCurnick, David J.en
dc.contributor.authorCollen, Benen
dc.contributor.authorKoldewey, Heather J.en
dc.contributor.authorJones, Kate E.en
dc.contributor.authorKemp, Kirsty M.en
dc.contributor.authorFerretti, Francescoen
dc.contributor.departmentFish and Wildlife Conservationen
dc.date.accessioned2020-08-17T19:11:33Zen
dc.date.available2020-08-17T19:11:33Zen
dc.date.issued2020-05-14en
dc.description.abstractThe efficacy of large marine protected areas (MPA) for the conservation of mobile pelagic species is widely debated. Here, we quantified spatial and temporal trends in standardized catch per unit effort (CPUE) of two target pelagic species, yellowfin (Thunnus albacares) and bigeye tuna (Thunnus obesus) in the Indian Ocean to analyze the impact of the British Indian Ocean Territory (BIOT) MPA's creation in 2010. We applied generalized additive mixed effects models to historical BIOT longline fishery logbooks and official catch and effort statistics from the Indian Ocean Tuna Commission (IOTC) to standardize CPUEs and to evaluate long-term trends and distribution patterns across the equatorial Indian Ocean. We find that trends in population indices from within BIOT prior to the MPA's establishment mirror those of the wider Indian Ocean. We also suggest that there may be behavioral plasticity within the yellowfin tuna stock, with some individuals possibly undertaking alternative migration patterns or exhibiting residency behavior within BIOT. Yet, we find no direct evidence of any improvement in standardized CPUE indices of either species in the area surrounding the BIOT MPA, nearly 8 years after its establishment. The average size of yellowfin and bigeye tunas caught both increased after the MPA's establishment. These patterns were also evident across the equatorial Indian Ocean, suggesting that any MPA effect is in combination with other regional drivers, such as behavioral changes in the fishing fleets in response to the threat of Somali Piracy. We therefore conclude that BIOT MPA may be providing local conservation value to tunas, but it is not significant enough to halt the overall regional decline in yellowfin tuna stocks. Thus, we emphasize that large MPAs should be considered in conjunction with other fishery management regulations and wider regional processes, rather than as a silver bullet, in order to provide the conservation and management benefits needed for mobile species like tunas.en
dc.description.notesThis work was funded by the Zoological Society of London, a University College London Impact Award and the Bertarelli Foundation through the Bertarelli Programme in Marine Science.en
dc.description.sponsorshipZoological Society of London; University College London Impact Award; Bertarelli Foundation through the Bertarelli Programme in Marine Scienceen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.3389/fmars.2020.00318en
dc.identifier.eissn2296-7745en
dc.identifier.other318en
dc.identifier.urihttp://hdl.handle.net/10919/99726en
dc.identifier.volume7en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectBritish Indian Ocean Territory (BIOT)en
dc.subjectfisheriesen
dc.subjectgeneralized additive mixed models (GAMM)en
dc.subjectlonglineen
dc.subjectmarine protected area (MPA)en
dc.subjectThunnus albacaresen
dc.subjectThunnus obesusen
dc.subjecttunaen
dc.titleInteractions Between a Large Marine Protected Area, Pelagic Tuna and Associated Fisheriesen
dc.title.serialFrontiers In Marine Scienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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