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Title: Effect of circulation at early life stages of European anchovy in the Bay of Biscay from observational data and a Lagrangian approach
Authors: Manso-Narvarte, Ivan; Caballero, Ainhoa; Hernandez-Carrasco, Ismael; Orfila, Alejandro; Mocoroa, Maria Santos; Cotano, Unai; Jorda, Gabriel; Declerck, Amandine; Delpey, Matthias; Rubio, Anna
Abstract: Coastal circulation influences the distribution of European anchovy (Engraulis encrasicolus) at early life stages (ELS) in the Bay of Biscay (BoB). However, how this happens is not yet fully understood. In this work, further insight is provided by performing Lagrangian diagnostics based on observations of ELS anchovies' initial distributions and currents. Surface diagnostics were obtained by using high-frequency radar (HFR) currents and were applied to analyse multiyear variability and detect the coastal processes that affect the distribution. Since ELS anchovies are also located at subsurface levels, subsurface diagnostics were obtained by using currents reconstructed from HFR and ADCP observations with a reduced order optimal interpolation (ROOI) method. The analyses included transport computations as well as the analysis of flow properties by Lagrangian Coherent Structures and chlorophyll-a satellite images.Results suggest that ELS anchovies are mostly retained over the shelf and slope, and that transport patterns highly vary across different periods. Mesoscale structures such as eddies, fronts and along-slope currents within the slope and the Capbreton canyon area, as well as strong and persistent winds, could significantly impact the distribution of ELS anchovies. In some periods, the resulting distribution might be due to a combination of these processes. Circulation can also play a key role in ELS anchovy aggregation within short time scales (20 days). This work showcases the potential of observation-based approaches and emphasizes the relevance of coastal observatories for integrated studies.
Keywords: Lagrangian diagnostics; Coastal circulation; Transport processes; Fish larvae; HF radar; Multiplatform observations; 3D data reconstruction; Lagrangian Coherent Structures; Bay of Biscay; ENGRAULIS-ENCRASICOLUS-L.; HIGH-FREQUENCY RADAR; HF RADAR; VERTICAL-DISTRIBUTION; SPATIAL-DISTRIBUTION; COHERENT STRUCTURES; SURFACE DRIFTERS; SOUTHERN BAY; FISH LARVAE; SE BAY
Issue Date: 2024
Publisher: ELSEVIER
Type: Article; Early Access
DOI: 10.1016/j.jmarsys.2023.103938
ISSN: 0924-7963
E-ISSN: 1879-1573
Funder: JERICO-S3 project - European Union [871153]
Departamento de Medio Ambiente, Ordenacion del Territorio, Agricultura y Pesca of the Basque Government
LAMARCA - MICIN/AEI [PID2021-123352OB- C31, PID2021-123352OB-C33]
Tech2Coast - MCIN/AEI [TED2021- 130949B-I00]
EU ``NextGenerationEU/PRTR��
European Union [862626]
EMFF (European Maritime Fishing Funds)
Project TRITOP - University of the Balearic Islands [UIB2021-PD06]
Appears in Publication types:Artículos científicos

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