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Title: Adult-mediated connectivity and spatial population structure of sardine in the Bay of Biscay and Iberian coast
Authors: Silva, Alexandra; Garrido, Susana; Ibaibarriaga, Leire and Pawlowski, Lionel; Riveiro, Isabel; Marques, Vitor; Ramos, Fernando; Duhamel, Erwan; Iglesias, Magdalena; Bryere, Philippe and Mangin, Antoine; Citores, Leire; Carrera, Pablo; Uriarte, Andres
Abstract: This work investigated adult-mediated connectivity and spatial population structure of sardine in the European Atlantic waters. The spatial and temporal progress of cohorts was modelled using abundance-at-age survey data by area in the period 2000-2016, covering the region from the northern Bay of Biscay to the eastern Gulf of Cadiz. A novel methodology was used to calculate indices of cohort movement between areas. Movement was relatively low between three large regions, the Bay of Biscay, the northern Spanish and Portuguese waters and the Gulf of Cadiz, each hosting a recruitment hotspot. On the other hand, one half of the sardines recruited in North Portugal and a quarter of those recruited in Southwest Portugal moved to northern Spanish waters and South Portugal, sustaining local populations and fisheries. Movement was mainly driven by recruitment strength and, in a less extent, by food availability during fall. The connectivity and dynamic patterns suggest a meta population with three weakly connected populations and density-dependent source-sink movement within the northern Spanish and Portuguese waters population. While the weak connectivity does not invalidate the management boundary between the Bay of Biscay and the Iberian Peninsula, the Gulf of Cadiz may be treated as a separate stock. Multi-area/metapopulation assessment approaches should be applied to account for complex population structure, the higher risks of depleting source areas and/or less productive populations.
Keywords: Metapopulation; Source-sink dynamics; Adult-mediated connectivity; Cohort dispersal; Small pelagic fishes; Stock identity; Fisheries management; GEOGRAPHIC VARIABILITY; NORTHEASTERN ATLANTIC; EUROPEAN SARDINE; STOCK ASSESSMENT; MARINE FISH; PILCHARDUS; DYNAMICS; TEMPERATURE; SELECTION; GROWTH
Issue Date: 2019
Type: Article; Proceedings Paper
DOI: 10.1016/j.dsr2.2018.10.010
ISSN: 0967-0645
E-ISSN: 1879-0100
Funder: European Union Data Collection FrameworkEuropean Union (EU)
Institute Portugues do Mar e da Atmosfera (IPMA)
Institut de Recherche Halieutique, (IFREMER)
AZTI Technalia
Instituto Espanol de Oceanografia (IEO)
ARGANS - Satellite Remote Sensing and Earth Observation, Marine and Environmental Sciences Centre (MARE)
Portuguese Foundation for Science and TechnologyPortuguese Foundation for Science and Technology [UID/MAR/04292/2013]
Appears in Publication types:Artículos científicos

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