RT journal article
T1 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
A1 Casaucao Aguilar, Andrea
A1 González-Ortegón, Enrique
A1 Jiménez, María P.
A1 Teles-Machado, Ana
A1 Plecha, Sandra
A1 Peliz, A.
A1 Laiz Alonso, Irene María
A2 Física Aplicada
K1 Engraulis encrasicolus
K1 Anchovy early stages
K1 Gulf of Cadiz
K1 Lagrangian transport
K1 ROMS
K1 Connectivity
AB 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
PB ELSEVIER
SN 0048-9697
YR 2021
FD 2021-08
LK http://hdl.handle.net/10498/25261
UL http://hdl.handle.net/10498/25261
LA eng
NO 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 'SARDINHA2020Abordagem Ecossistemica para a gestAo da pesca da sardinha (MAR01.04.02FEAMP0009) ', 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 Oceanograflia y Teedeteccion (Spain) . The authors are also grateful to Dr. Morais and to another anonymous reviewer for their constructive comments.
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026