@article{fdi:010094874,
  title = {{B}iobio river freshwater discharge effect on {E}ngraulis ringens early stages transport in the {G}ulf of {A}rauco ({C}hile) using biophysical modeling},
  author = {{S}oto-{M}endoza, {S}. and {V}ergara, {O}. {A}. and {E}chevin, {V}incent and {C}astro, {L}. and {C}ubillos, {L}. {A}. and {S}obarzo, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {G}ulf of {A}rauco, a highly productive area, sustains some of the primary epipelagic, mesopelagic, and benthic resources in the {S}outhern {H}umboldt {C}urrent {S}ystem. {I}t is also an important nursery and spawning area. {H}igh productivity is driven by seasonal and synoptic wind variability, coastal upwelling, topographic upwelling from the {B}iobio {S}ubmarine {C}anyon, and freshwater flow, mostly from the {B}iobio {R}iver. {T}he effect of freshwater discharge on early-stage fisheries resources has been poorly studied in central {C}hile, making our research all the more significant. {F}rom 2014 to 2018, a high-resolution interannual biophysical simulation incorporating the {B}iobio {R}iver freshwater discharge was conducted. {I}t allowed us to thoroughly examine the impact of the {B}iobio {R}iver on the abundance and transport of anchovy early-life stages in the {G}ulf of {A}rauco. {T}o ensure the accuracy of our findings, we compared model results to in-situ biological/hydrographic data in the {G}ulf of {A}rauco from 2007 to 2019. {T}he biophysical model was run with release pulses every five days from {S}eptember 1 to {O}ctober 31. {I}n the research area, the months of {S}eptember and {O}ctober have traditionally been identified as anchovy spawning months. {T}he simulation was evaluated using {G}eneral {L}inear {M}odels, which suggested that larval survival would be influenced by the spawning's temporal fluctuation (year and day of release). {T}he extension of the {B}iobo {R}iver plume, identified using the potential energy anomaly, was found to be similar to the observations. {T}he model results showed that larvae were largely transported northward, and spawning zones from the research period showed strong retention in the {G}ulf of {A}rauco. {T}he highest abundances of anchovy early-life stages were found south of the {B}iobio {R}iver mouth, in highly stratified waters associated with the {B}iobio {R}iver plume in the {G}ulf of {A}rauco. {S}ignificant correlations between {B}iobio {R}iver's monthly mean discharge, river plume extension, and anchovy early-life stages abundance were observed from 2014 to 2018, both for simulated and in situ data. {H}owever, when considering a larger egg in situ abundance time series data in situ (from 2007 to 2019), significant correlations were observed between egg abundance and the river plume extension area ({R}2 = 0.7 p = 0.03) only up to a threshold value, which ranged from 338 to 357 km2); below and above this threshold, abundance dropped drastically. {T}his research concludes that the {B}iobio {R}iver is an essential factor regulating the early stages of the life of anchovy in the {G}ulf of {A}rauco.},
  keywords = {{A}nchovy early stages transport and retention ; {B}iobio river freshwater ; discharge {G}ulf of {A}rauco ; {S}outhern {H}umboldt current system ; {CHILI} ; {PACIFIQUE} ; {ARAUCO} {GOLFE} ; {BIOBIO} {COURS} {D}'{EAU}},
  booktitle = {},
  journal = {{E}stuarine {C}oastal and {S}helf {S}cience},
  volume = {324},
  numero = {},
  pages = {109438 [17 p.]},
  ISSN = {0272-7714},
  year = {2025},
  DOI = {10.1016/j.ecss.2025.109438},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094874},
}