Trophic interactions in northern Chile upwelling ecosystem, year 1997

A food web model is constructed to describe predator-prey interactions, community structure and trophic flows in northern Chile upwelling ecosystem (18°20'S, 24°S), for the year 1997. The model is built using the Ecopath with Ecosim software version 6.4, and encompasses 21 functional groups, ra...

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Autores principales:	Barros,Mónica E, Neira,Sergio, Arancibia,Hugo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2014
Materias:	upwelling trophic level trophic interaction Ecopath Ecosim northern Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000500015
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spelling	oai:scielo:S0718-560X20140005000152015-11-12Trophic interactions in northern Chile upwelling ecosystem, year 1997Barros,Mónica ENeira,SergioArancibia,Hugo upwelling trophic level trophic interaction Ecopath Ecosim northern Chile A food web model is constructed to describe predator-prey interactions, community structure and trophic flows in northern Chile upwelling ecosystem (18°20'S, 24°S), for the year 1997. The model is built using the Ecopath with Ecosim software version 6.4, and encompasses 21 functional groups, ranging from primary producers (phytoplankton) to top predators (birds and marine mammals), the principal fishing resources and the fishery. Input parameters required to build the model were gathered from specialized literature, grey literature and our own estimates. The results indicated that the total biomass (B T) was estimated at 624.7 ton km-2. The combined biomass of small pelagic fish represented 26% of B T, while the combined biomass of demersal fish represented only 0.1% of B T. These results highlight the importance of pelagic fish in this system. Predation mortality resulted to be the main source of mortality. Nevertheless, fishing mortality was important in anchovy, mackerel, common dolphinfish and jack mackerel. The mean trophic level of the fishery was estimated as 3.7, with landings sustained mainly by anchovy. Primary production required to sustain the landings (PPR) was estimated at 7.5% of calculated total net primary production, which is lower than PPR estimates in other upwelling ecosystems. The average trophic transfer efficiency was 18%, which is in the range (10-20%) informed for marine ecosystems. Results indicate that in 1997 the northern Chile marine ecosystem was characterized for being a system far from maturity, dominated in terms of biomass and flows by the pelagic realm.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.42 n.5 20142014-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000500015en10.3856/vol42-issue5-fulltext-15
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	upwelling trophic level trophic interaction Ecopath Ecosim northern Chile
spellingShingle	upwelling trophic level trophic interaction Ecopath Ecosim northern Chile Barros,Mónica E Neira,Sergio Arancibia,Hugo Trophic interactions in northern Chile upwelling ecosystem, year 1997
description	A food web model is constructed to describe predator-prey interactions, community structure and trophic flows in northern Chile upwelling ecosystem (18°20'S, 24°S), for the year 1997. The model is built using the Ecopath with Ecosim software version 6.4, and encompasses 21 functional groups, ranging from primary producers (phytoplankton) to top predators (birds and marine mammals), the principal fishing resources and the fishery. Input parameters required to build the model were gathered from specialized literature, grey literature and our own estimates. The results indicated that the total biomass (B T) was estimated at 624.7 ton km-2. The combined biomass of small pelagic fish represented 26% of B T, while the combined biomass of demersal fish represented only 0.1% of B T. These results highlight the importance of pelagic fish in this system. Predation mortality resulted to be the main source of mortality. Nevertheless, fishing mortality was important in anchovy, mackerel, common dolphinfish and jack mackerel. The mean trophic level of the fishery was estimated as 3.7, with landings sustained mainly by anchovy. Primary production required to sustain the landings (PPR) was estimated at 7.5% of calculated total net primary production, which is lower than PPR estimates in other upwelling ecosystems. The average trophic transfer efficiency was 18%, which is in the range (10-20%) informed for marine ecosystems. Results indicate that in 1997 the northern Chile marine ecosystem was characterized for being a system far from maturity, dominated in terms of biomass and flows by the pelagic realm.
author	Barros,Mónica E Neira,Sergio Arancibia,Hugo
author_facet	Barros,Mónica E Neira,Sergio Arancibia,Hugo
author_sort	Barros,Mónica E
title	Trophic interactions in northern Chile upwelling ecosystem, year 1997
title_short	Trophic interactions in northern Chile upwelling ecosystem, year 1997
title_full	Trophic interactions in northern Chile upwelling ecosystem, year 1997
title_fullStr	Trophic interactions in northern Chile upwelling ecosystem, year 1997
title_full_unstemmed	Trophic interactions in northern Chile upwelling ecosystem, year 1997
title_sort	trophic interactions in northern chile upwelling ecosystem, year 1997
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000500015
work_keys_str_mv	AT barrosmonicae trophicinteractionsinnorthernchileupwellingecosystemyear1997 AT neirasergio trophicinteractionsinnorthernchileupwellingecosystemyear1997 AT arancibiahugo trophicinteractionsinnorthernchileupwellingecosystemyear1997
_version_	1714205134779580416

Trophic interactions in northern Chile upwelling ecosystem, year 1997

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