RT Conference Proceedings
T1 Bottom-up control of sardine and anchovy population cycles in the canary current: insights from an end-to-end model simulation
A1 Sánchez-Garrido, José Carlos
A1 Werner, Francisco
A1 Fiechter, Jerome
A1 Ramos, Antonio
A1 Curchitser, Enrique
A1 Rose, Kenneth
A1 García-Lafuente, Jesús
A1 Arístegui, Javier
A1 Hernández León, Santiago
A1 Santana, Ángel
K1 Sardinas - Poblaciones - Métodos de simulación
AB Sardine and anchovy can exhibit dramatic decadal-scale shifts in abundance inresponse to climate variability. Sharpe declines of these populations entail particularlyserious commercial and ecological consequences in eastern boundary current ecosystems,where they sustain major world fisheries and provide the forage for a broad variety ofpredators. Understanding the mechanisms and environmental forcing that drive theobserved fish variability remains a challenging problem. The modelling study presentedhere provides an approach that bridges a comprehensive database with an end-to-endmodelling framework enabling the investigation of the sources of variability of sardine andanchovy in the Canary Current System. Different biological traits and behaviourprescribed for sardine and anchovy gave rise to different distribution and displacements ofthe populations, but to a rather synchronous variability in terms of abundance and biomass,in qualitative agreement with historical landing records. Analysis of years withanomalously high increase and decline of the adult population points to food availability(instead of temperature or other environmental drivers) as the main environmental factordetermining recruitment for both sardine (via spawning and survival of feeding age-0individuals) and anchovy (via survival of feeding age-0). Consistent with this, the twospecies thrive under enhanced upwelling-favourable winds, but only up to some thresholdof the wind velocity beyond which larval drift mortality exceeds the positive effect of theextra food supply. Based on the analysis of the simulation, we found that anchovy larvae are particularly vulnerable to enhanced wind-driven advection, and as such do better withmore moderate upwelling than sardines.
YR 2018
FD 2018-06-28
LK https://hdl.handle.net/10630/16053
UL https://hdl.handle.net/10630/16053
LA eng
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026