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• W4225137462 endingPage "107860" @default.
• W4225137462 startingPage "107860" @default.
• W4225137462 abstract "The blue jack mackerel Trachurus picturatus is one of the most important pelagic fish captured in the Macaronesian islands of the Azores and Madeira. However, in the last years' landings registered substantial decreases. Fluctuations may be related to oscillations in the cohorts’ recruitment rates, although no information regarding the species movements and connectivity is available. The present study applies laser ablation inductively coupled-plasma mass spectrometry (LA-ICP-MS) to investigate the otolith chemical fingerprints (core and edge) of three cohorts sampled off the Azores, Madeira, Canaries and Peniche (Portuguese coast) in 2013, 2016 and 2019. Otoliths from juveniles (age 0+ and 1+) and adults (age 3+) were examined to infer the scale of geographical variation among fishing grounds and years. Univariate analyses showed significant differences among locations based on Li:Ca, Mg:Ca, Sr:Ca and Ba:Ca concentration ratios. Multi-elemental analyses allocated 70% (2013), 43% (2016) and 43% (2019) of the individuals to their original location based on core elemental fingerprint, and 63% (2013), 75% (2016) and 83% (2019) based on the edge elemental signature. The natal signature suggests that there is some degree of self-recruitment in the fishing grounds and that the subpopulations are connected essentially by dispersal of larvae/juveniles. Furthermore, data suggests that self-recruitment is variable among the cohorts sampled. The discrimination of individuals observed at the time of collection suggests that T. picturatus populations across the north-eastern Atlantic should be regarded as different population units and manage accordingly, as previously observed. Future works should focus on identifying the natal sources of each fishing ground and assess the impact of environmental changes on the distance and direction of larval dispersal." @default.
• W4225137462 created "2022-05-01" @default.
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• W4225137462 date "2022-08-01" @default.
• W4225137462 modified "2023-09-27" @default.
• W4225137462 title "Unravelling the spatial-temporal population structure of Trachurus picturatus across the North-East Atlantic using otolith fingerprinting" @default.
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• W4225137462 doi "https://doi.org/10.1016/j.ecss.2022.107860" @default.
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