Please use this identifier to cite or link to this item:
Files in This Item:
There are no files associated with this item.
Full metadata record
DC FieldValueLanguage
dc.contributor.authorRooker, Jay R.
dc.contributor.authorFraile, Igaratza
dc.contributor.authorLiu, Hui
dc.contributor.authorAbid, Noureddine and Dance, Michael A.
dc.contributor.authorItoh, Tomoyuki
dc.contributor.authorKimoto, Ai
dc.contributor.authorTsukahara, Yohei
dc.contributor.authorRodriguez-Marin, Enrique
dc.contributor.authorArrizabalaga, Haritz
dc.description.abstractUncertainty regarding the movement and population exchange of Atlantic bluefin tuna (Thunnus thynnus) from the two primary spawning areas (Gulf of Mexico, Mediterranean Sea) is increasingly implicated as a major impediment for the conservation of this species. Here, two mixture methods were applied to natural chemical markers (delta O-18 and delta C-13) in otoliths (ear stones) to comprehensively investigate the nature and degree of transoceanic movement and mixing of eastern and western populations in several areas of the North Atlantic Ocean that potentially represent mixing hotspots. Areas investigated occurred on both sides of the 45 degrees W management boundary as well as waters off the coast of Africa (Morocco, Canary Islands) where both populations are known to occur. Projections of population composition (i.e., natal or nursery origin) from a multinomial logistic regression (MLR) classification method with different probability thresholds were generally in agreement with maximum likelihood estimates from the commonly used mixed-population program HISEA; however, predicted contributions for the less abundant population were occasionally higher for MLR estimates. Both MLR and HISEA clearly showed that mixing of Atlantic bluefin tuna in the Central North Atlantic Ocean was highly variable from year to year with expatriates of eastern or western origin commonly crossing into the other management area. Pronounced transoceanic movement and mixing of western migrants was also present off the coast of Africa, with the occurrence of western migrants in the Canary Islands and Morocco ranging from zero to the majority of the individuals assayed for the years examined. Results indicate highly variable rates of movement and population exchange for Atlantic bluefin tuna, highlighting the need for temporally resolved estimates of natal origin in mixing hotspots to improve population models used to evaluate the status of this threatened species.
dc.subjectnatal origin
dc.subjectstock mixing
dc.subjectMediterranean Sea
dc.subjectotolith chemistry
dc.subjectstable isotopes
dc.subjectNATAL ORIGIN
dc.titleWide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean
dc.identifier.journalFRONTIERS IN MARINE SCIENCE
dc.contributor.funderEuropean Community, Canada [SI2/542789]
dc.contributor.funderMcDaniel Charitable Foundation
dc.contributor.funderSpanish Ministry of Economy and Competitiveness (MINECO) [CTM2011-27505]
dc.contributor.funderEuropean Community, Croatia [SI2/542789]
dc.contributor.funderEuropean Community, JapanEuropean Community (EC) [SI2/542789]
dc.contributor.funderEuropean Community, Norway [SI2/542789]
dc.contributor.funderEuropean Community, TurkeyEuropean Community (EC) [SI2/542789]
dc.contributor.funderEuropean Community, United StatesEuropean Community (EC) [SI2/542789, NMFS NA11NMF4720107]
dc.contributor.funderEuropean Community, Chinese TaipeiEuropean Community (EC) [SI2/542789]
dc.contributor.funderICCAT Secretariat
Appears in Publication types:Artículos científicos

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.