Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009

Changes in abundance and distribution of anchovy and other species of pelagic fish of the Northern Humboldt Current System (NHCS) are driven by environmental forcing variations in different time and spatial scales between the coastal 'cold' ecosystem and the 'warm' oceanic one. D...

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Autores principales:	Gutiérrez,Mariano, Castillo,Ramiro, Segura,Marceliano, Peraltilla,Salvador, Flores,Miguel
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2012
Materias:	acoustics small pelagic fish landings biomass latitudinal distribution El Nino Perú
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300012
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spelling	oai:scielo:S0718-560X20120003000122013-01-03Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009Gutiérrez,MarianoCastillo,RamiroSegura,MarcelianoPeraltilla,SalvadorFlores,Miguel acoustics small pelagic fish landings biomass latitudinal distribution El Nino Perú Changes in abundance and distribution of anchovy and other species of pelagic fish of the Northern Humboldt Current System (NHCS) are driven by environmental forcing variations in different time and spatial scales between the coastal 'cold' ecosystem and the 'warm' oceanic one. Data to study these fluctuations have come mostly from the fishery to show how anchovy (Engraulis ringens) increases when sardine (Sardinops sagax) declines and vice versa. However, using acoustic data on latitudinal biomass we show that other species as mackerel (Scomber japonicus) and jack mackerel (Trachurus murphyi) also follow the same opposed trend, then the fishery data hides the true dimension of the balance of abundance among species. Based on Hovmoller diagrams we scrutinized the changes in interannual latitudinal acoustic biomass, landings and influence of El Nino events from 1966 to 2009 in order to describe: 1) how the anchovy decadal distribution pattern moved from south to north since the 1960's; 2) how there have been produced concomitant changes in the latitudinal abundance and distribution of other species such as sardine, jack mackerel and mackerel before, during and after El Nino events; and 3) what was the overall effect of the succession of El Nino events on all these pelagic species. We concluded that: a) every El Nino event has had an effect on the expansion or contraction of pelagic species distribution and abundance, with different latitudinal effects; and b) the El Nino 1997-98 did not trigger but accelerated a decline phase on the abundance of sardine, jack mackerel and mackerel by a reduction of their ideal habitat due to an expansion of the coastal ecosystem caused by a shallower location of the upper limit of the Oxygen Minimum Zone (OMZ) These findings observed using past data might be taken into consideration for fishery management purposes when considering future scenarios.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.40 n.SpecIssue 20122012-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300012en103856/vol40-issue3-fulltext-12
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	acoustics small pelagic fish landings biomass latitudinal distribution El Nino Perú
spellingShingle	acoustics small pelagic fish landings biomass latitudinal distribution El Nino Perú Gutiérrez,Mariano Castillo,Ramiro Segura,Marceliano Peraltilla,Salvador Flores,Miguel Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
description	Changes in abundance and distribution of anchovy and other species of pelagic fish of the Northern Humboldt Current System (NHCS) are driven by environmental forcing variations in different time and spatial scales between the coastal 'cold' ecosystem and the 'warm' oceanic one. Data to study these fluctuations have come mostly from the fishery to show how anchovy (Engraulis ringens) increases when sardine (Sardinops sagax) declines and vice versa. However, using acoustic data on latitudinal biomass we show that other species as mackerel (Scomber japonicus) and jack mackerel (Trachurus murphyi) also follow the same opposed trend, then the fishery data hides the true dimension of the balance of abundance among species. Based on Hovmoller diagrams we scrutinized the changes in interannual latitudinal acoustic biomass, landings and influence of El Nino events from 1966 to 2009 in order to describe: 1) how the anchovy decadal distribution pattern moved from south to north since the 1960's; 2) how there have been produced concomitant changes in the latitudinal abundance and distribution of other species such as sardine, jack mackerel and mackerel before, during and after El Nino events; and 3) what was the overall effect of the succession of El Nino events on all these pelagic species. We concluded that: a) every El Nino event has had an effect on the expansion or contraction of pelagic species distribution and abundance, with different latitudinal effects; and b) the El Nino 1997-98 did not trigger but accelerated a decline phase on the abundance of sardine, jack mackerel and mackerel by a reduction of their ideal habitat due to an expansion of the coastal ecosystem caused by a shallower location of the upper limit of the Oxygen Minimum Zone (OMZ) These findings observed using past data might be taken into consideration for fishery management purposes when considering future scenarios.
author	Gutiérrez,Mariano Castillo,Ramiro Segura,Marceliano Peraltilla,Salvador Flores,Miguel
author_facet	Gutiérrez,Mariano Castillo,Ramiro Segura,Marceliano Peraltilla,Salvador Flores,Miguel
author_sort	Gutiérrez,Mariano
title	Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
title_short	Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
title_full	Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
title_fullStr	Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
title_full_unstemmed	Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009
title_sort	trends in spatio-temporal distribution of peruvian anchovy and other small pelagic fish biomass from 1966-2009
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000300012
work_keys_str_mv	AT gutierrezmariano trendsinspatiotemporaldistributionofperuviananchovyandothersmallpelagicfishbiomassfrom19662009 AT castilloramiro trendsinspatiotemporaldistributionofperuviananchovyandothersmallpelagicfishbiomassfrom19662009 AT seguramarceliano trendsinspatiotemporaldistributionofperuviananchovyandothersmallpelagicfishbiomassfrom19662009 AT peraltillasalvador trendsinspatiotemporaldistributionofperuviananchovyandothersmallpelagicfishbiomassfrom19662009 AT floresmiguel trendsinspatiotemporaldistributionofperuviananchovyandothersmallpelagicfishbiomassfrom19662009
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Trends in spatio-temporal distribution of Peruvian anchovy and other small pelagic fish biomass from 1966-2009

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