Assessment of the spawning habitat, spatial distribution, and Lagrangian dispersion of the European anchovy (Engraulis encrasicolus) early stages in the Gulf of Cadiz during an apparent anomalous episode in 2016
| Autor: | Enrique González-Ortegón, Irene Laiz, Andrea Casaucao, Sandra Plecha, Ana Teles-Machado, M. P. Jiménez, Álvaro Peliz |
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| Přispěvatelé: | CSIC - Instituto Español de Oceanografía (IEO), Universidad de Cádiz, Física Aplicada, Víctor M. León |
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Engraulis encrasicolus Spawning habitat habitat spawning 010501 environmental sciences Centro Oceanográfico de Cádiz Spatial distribution 01 natural sciences Engraulis Gulf of Cadiz ROMS geographical distribution Lagrangian transport Environmental Chemistry European anchovy Pesquerías Waste Management and Disposal 0105 earth and related environmental sciences fish Connectivity biology Lagrangian dispersion biology.organism_classification Pollution Fishery Geography dispersion Anchovy early stages |
| Zdroj: | Science of the Total Environment 781 (2021) 146530 Digital.CSIC. Repositorio Institucional del CSIC instname RODIN. Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz RODIN: Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz Universidad de Cádiz e-IEO. Repositorio Institucional Digital de Acceso Abierto del Instituto Español de Oceanografía |
| Popis: | Modelling the environmental factors influencing the spatial variation of fish early life stages density and their drift history can identify the key biological and physical processes for the recruitment variability. Distance-based linear multivariate techniques were used to characterize the spawning areas of the European anchovy Engraulis encrasicolus in the Gulf of Cadiz (GoC). Chlorophyll is the environmental variable that best characterized its spawning areas with a time-lag of three days. The use of Lagrangian models to simulate the dispersal of small pelagic species more dependent on advection such as the European anchovy early life stages (early larvae and eggs) in the GoC could provide the degree of connectivity between spawning and nursery areas and identify the physical drivers of the recruitment variability. The larval final destination is critical for the survival of a marine species which is coastal-dependent during its early life stages. Simulations with a Lagrangian transport model in the Southwest Iberian Peninsula were performed during the most intense spawning peak of 2016, when a strong and persistent countercurrent event developed. Most of the simulated early life stages were transported to the western Portuguese coast and, to a lesser extent, to the Atlantic oligotrophic waters, suggesting an increase in the connectivity between the subdivision 9a South and West components. Although different environmental processes occurring during ontogenetic stages, as well as overfishing, among others, can explain part of the variability observed in recruitment, events such as the development of coastal countercurrents during the spawning season could partly account for an increase of anchovy on the western Portuguese coast and a decrease in the Gulf of Cadiz one year later. Financial support was given by ECOCADIZ 2016 (Spanish Institute of Oceanography, Spain). The authors thank the crews of the R/V Miguel Oliver for technical assistance on the field. ATM acknowledges project 'SARDINHA2020-Abordagem Ecossistémica para a gestão da pesca da sardinha (MAR-01.04.02-FEAMP-0009)', from the Programa Operacional MAR 2020 (Portugal). Open Access has been partly financed by the University of Cadiz (Spain), the Campus de Excelencia Internacional/Global del Mar (CEI MAR, Spain), and the research group RNM337-Oceanograflía y Teedetección (Spain). |
| Databáze: | OpenAIRE |
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