Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model

The eastern boundary of the Chile-Peru Current System constitutes one of the most biologically productive ecosystems in the world, due largely to coastal upwelling and the horizontal advection of nutrients. In this ecosystem, El Niño events are of great importance in the interannual variability of t...

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Autores principales:	Yáñez,Eleuterio, Hormazábal,Samuel, Silva,Claudio, Montecinos,Aldo, Barbieri,M. Angela, Valdenegro,Alexander, Órdenes,Alejandra, Gómez,Fabián
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2008
Materias:	pelagic fishery environmental variability conceptual model northern Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2008000200003
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spelling	oai:scielo:S0718-560X20080002000032009-01-23Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual modelYáñez,EleuterioHormazábal,SamuelSilva,ClaudioMontecinos,AldoBarbieri,M. AngelaValdenegro,AlexanderÓrdenes,AlejandraGómez,Fabián pelagic fishery environmental variability conceptual model northern Chile The eastern boundary of the Chile-Peru Current System constitutes one of the most biologically productive ecosystems in the world, due largely to coastal upwelling and the horizontal advection of nutrients. In this ecosystem, El Niño events are of great importance in the interannual variability of the environment. A change was observed in the environmental regime at the beginning of the 1970s with the onset of the 1972-1973 El Niño, marking an important decrease in the anchovy fishery (Engraulis ringens). After the mid-1970s, sardine (Sardinops sagax) landings increased noticeably. A second regime shift at the end of the 1980s was seen mostly in the noticeable recovery of anchovy and the decline of sardine. Herein, we present an integrated conceptual model of the different local and large-scale phenomena that affect the marine environment off northern Chile and the distribution and abundance of pelagic resources. The model considers an analysis of environmental and bio-fishery data on different scales and describes how the interdecadal (associated with re-gime shifts) and interannual (associated with El Niño events) fluctuations in the Equatorial Pacific are mani-fested in the eastern South Pacific and, therefore, in the northern zone off Chile, affecting the annual eyele, the dynamic of the coastal trapped waves, and coastal upwelling. In this framework, interdecadal fluctuations play an important role in the anchovy-sardine-anchovy replacement sequence.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.36 n.2 20082008-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2008000200003en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	pelagic fishery environmental variability conceptual model northern Chile
spellingShingle	pelagic fishery environmental variability conceptual model northern Chile Yáñez,Eleuterio Hormazábal,Samuel Silva,Claudio Montecinos,Aldo Barbieri,M. Angela Valdenegro,Alexander Órdenes,Alejandra Gómez,Fabián Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
description	The eastern boundary of the Chile-Peru Current System constitutes one of the most biologically productive ecosystems in the world, due largely to coastal upwelling and the horizontal advection of nutrients. In this ecosystem, El Niño events are of great importance in the interannual variability of the environment. A change was observed in the environmental regime at the beginning of the 1970s with the onset of the 1972-1973 El Niño, marking an important decrease in the anchovy fishery (Engraulis ringens). After the mid-1970s, sardine (Sardinops sagax) landings increased noticeably. A second regime shift at the end of the 1980s was seen mostly in the noticeable recovery of anchovy and the decline of sardine. Herein, we present an integrated conceptual model of the different local and large-scale phenomena that affect the marine environment off northern Chile and the distribution and abundance of pelagic resources. The model considers an analysis of environmental and bio-fishery data on different scales and describes how the interdecadal (associated with re-gime shifts) and interannual (associated with El Niño events) fluctuations in the Equatorial Pacific are mani-fested in the eastern South Pacific and, therefore, in the northern zone off Chile, affecting the annual eyele, the dynamic of the coastal trapped waves, and coastal upwelling. In this framework, interdecadal fluctuations play an important role in the anchovy-sardine-anchovy replacement sequence.
author	Yáñez,Eleuterio Hormazábal,Samuel Silva,Claudio Montecinos,Aldo Barbieri,M. Angela Valdenegro,Alexander Órdenes,Alejandra Gómez,Fabián
author_facet	Yáñez,Eleuterio Hormazábal,Samuel Silva,Claudio Montecinos,Aldo Barbieri,M. Angela Valdenegro,Alexander Órdenes,Alejandra Gómez,Fabián
author_sort	Yáñez,Eleuterio
title	Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
title_short	Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
title_full	Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
title_fullStr	Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
title_full_unstemmed	Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model
title_sort	coupling between the environment and the pelagic resources exploited off northern chile: ecosystem indicators and a conceptual model
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2008000200003
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Coupling between the environment and the pelagic resources exploited off northern Chile: ecosystem indicators and a conceptual model

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