@article{fdi:010063603,
  title = {{A}nchovy population and ocean-climatic fluctuations in the {H}umboldt {C}urrent {S}ystem during the last 700 years and their implications},
  author = {{G}uinez, {M}. and {V}aldes, {J}. and {S}ifeddine, {A}bdelfettah and {B}oussafir, {M}. and {D}avila, {P}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} marine sedimentary record collected from 87 m water depth in a coastal environment of the {H}umboldt {C}urrent {S}ystem ({M}ejillones {B}ay, 23 degrees {S}, northern {C}hile) was used to reconstruct the past 700 years of ocean-climatic conditions and to study the influence of any changes on anchovy population dynamics. {W}e analyzed quartz, organic carbon, total nitrogen, alkenones and fish scales. {F}our stratigraphic units in the sediment column correspond with fluctuations in these and other proxies. {L}ow {S}cale {D}eposition {R}ate ({SDR}) values from 1330 to 1420 suggest a low abundance of anchovy in this coastal environment. {T}hree subsequent cycles of ca. 170 years each showed an increase and decrease of anchovy populations, which is in agreement with changes in the wind regime, sea surface temperature and primary productivity. {S}ince ca. 1840, marked fluctuations of {SDR} have been observed, probably as a consequence of the onset of a different oceanographic regime characterized by intensified southern winds and upwelling, colder surface waters, higher primary productivity, and enhanced "{L}a {N}ina like" interdecadal variability. {A}n increase of the anchovy population was observed until halfway through the 20th century, followed by a decrease, even though water temperature decreased and primary productivity increased. {T}his situation is likely the consequence of the increased fishery activity that developed in this zone during the last 60 years. {A}fter analyzing the results obtained for anchovy {SDR}, we can determine that there is a relation between the abundance of this species and phases of the {P}acific {D}ecadal {O}scillation ({PDO}), in which an increase in the {SDR} coincides with a {PDO} cold phase, while a decline coincides with a warm phase. {F}ast {F}ourier transformation analysis applied to the time series obtained from the {M}ejillones sediment core and to the {N}orth {A}tlantic {O}scillation ({NAO}), the {PDO}, and the solar irradiance index time series shows three different decadal cycles (80-100 years, 61-75 years and 45-48 years approximately). {F}urthermore, the results of this study suggest that both the {PDO} and the {NAO} and the biogeochemical markers of {M}ejillones exhibit periodicities that fall within the 80 to 100 year {G}leissberg solar cycle, indicating that global solar radiation plays a key role in the local ocean-climatic processes and confirming teleconnection linkages between widely separated regions.},
  keywords = {{S}edimentary record ; {O}cean-climatic conditions ; {A}nchovy population ; {G}leissberg solar cycle ; {CHILI} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {415},
  numero = {{SI}},
  pages = {210--224},
  ISSN = {0031-0182},
  year = {2014},
  DOI = {10.1016/j.palaeo.2014.08.026},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063603},
}