Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach

ABSTRACT The continental shelf off central-south Chile sustains highly productive fisheries. The sustainability of these resources is nevertheless in jeopardy since many of them are either overexploited or collapsed. Using an allometrically (size-based) parameterized model of the shelf s food web, w...

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Autores principales:	Gómez-Canchong,Paúl, Quiñones,Renato A., Neira,Sergio, Arancibia,Hugo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2017
Materias:	allometry bio-energetic modeling ecological indicators fishing pressure food webs central-south Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000400748
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spelling	oai:scielo:S0718-560X20170004007482017-10-11Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approachGómez-Canchong,PaúlQuiñones,Renato A.Neira,SergioArancibia,Hugo allometry bio-energetic modeling ecological indicators fishing pressure food webs central-south Chile ABSTRACT The continental shelf off central-south Chile sustains highly productive fisheries. The sustainability of these resources is nevertheless in jeopardy since many of them are either overexploited or collapsed. Using an allometrically (size-based) parameterized model of the shelf s food web, we analyze the likely ecosystem effects of fishing in this system by measuring the response of several ecological indicators to changes in fishing pressure. Indicators performed as follows: i) insensitive (community biomass stability, clustering coefficient), ii) varying directly (number of species going "extinct") or inversely (Normalized biomass size spectra (NBSS) coefficient of determination), and iii) abrupt inverse change, but then insensitive beyond a threshold (Fishing in Balance (FiB) index, Mean Trophic Level of the Catch, NBSS slope, and total community biomass). The latter four indicators seem less informative for management once a fishery has developed. Simulations showed that fishing any single species affected several species through food web-mediated mechanisms, then making difficult to predict the effects of fishing on the abundance of target and non-target species. Therefore, conservation measures should not rely exclusively on reducing fishing mortality for a given target species, but also take into account the status of interacting species.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.45 n.4 20172017-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000400748en10.3856/vol45-issue4-fulltext-11
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	allometry bio-energetic modeling ecological indicators fishing pressure food webs central-south Chile
spellingShingle	allometry bio-energetic modeling ecological indicators fishing pressure food webs central-south Chile Gómez-Canchong,Paúl Quiñones,Renato A. Neira,Sergio Arancibia,Hugo Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
description	ABSTRACT The continental shelf off central-south Chile sustains highly productive fisheries. The sustainability of these resources is nevertheless in jeopardy since many of them are either overexploited or collapsed. Using an allometrically (size-based) parameterized model of the shelf s food web, we analyze the likely ecosystem effects of fishing in this system by measuring the response of several ecological indicators to changes in fishing pressure. Indicators performed as follows: i) insensitive (community biomass stability, clustering coefficient), ii) varying directly (number of species going "extinct") or inversely (Normalized biomass size spectra (NBSS) coefficient of determination), and iii) abrupt inverse change, but then insensitive beyond a threshold (Fishing in Balance (FiB) index, Mean Trophic Level of the Catch, NBSS slope, and total community biomass). The latter four indicators seem less informative for management once a fishery has developed. Simulations showed that fishing any single species affected several species through food web-mediated mechanisms, then making difficult to predict the effects of fishing on the abundance of target and non-target species. Therefore, conservation measures should not rely exclusively on reducing fishing mortality for a given target species, but also take into account the status of interacting species.
author	Gómez-Canchong,Paúl Quiñones,Renato A. Neira,Sergio Arancibia,Hugo
author_facet	Gómez-Canchong,Paúl Quiñones,Renato A. Neira,Sergio Arancibia,Hugo
author_sort	Gómez-Canchong,Paúl
title	Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
title_short	Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
title_full	Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
title_fullStr	Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
title_full_unstemmed	Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach
title_sort	modelling fishery-induced impacts on the food web of the continental shelf off central-south chile using a size-based network approach
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2017
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2017000400748
work_keys_str_mv	AT gomezcanchongpaul modellingfisheryinducedimpactsonthefoodwebofthecontinentalshelfoffcentralsouthchileusingasizebasednetworkapproach AT quinonesrenatoa modellingfisheryinducedimpactsonthefoodwebofthecontinentalshelfoffcentralsouthchileusingasizebasednetworkapproach AT neirasergio modellingfisheryinducedimpactsonthefoodwebofthecontinentalshelfoffcentralsouthchileusingasizebasednetworkapproach AT arancibiahugo modellingfisheryinducedimpactsonthefoodwebofthecontinentalshelfoffcentralsouthchileusingasizebasednetworkapproach
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Modelling fishery-induced impacts on the food web of the continental shelf off central-south Chile using a size-based network approach

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