Uncertain population dynamic and state variables of alfonsino (Beryx splendens)

Alfonsino (Beryx splendens) is a species associated with seamounts, with an important fishery in Juan Fernandez archipelago, Chile (33°40'S, 79°00'W). Since 2004, this resource has been managed by catch quotas estimated from stock assessment models. The alfonsino model involves high levels...

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Autores principales:	Wiff,Rodrigo, Quiroz,Juan Carlos, Gatica,Claudio, Contreras,Francisco, Paramo,Jorge, Barrientos,Mauricio A
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2012
Materias:	Beryx splendens stock assessment uncertainty seamounts population dynamics southeastern Pacific Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100019
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spelling	oai:scielo:S0718-560X20120001000192012-05-16Uncertain population dynamic and state variables of alfonsino (Beryx splendens)Wiff,RodrigoQuiroz,Juan CarlosGatica,ClaudioContreras,FranciscoParamo,JorgeBarrientos,Mauricio A Beryx splendens stock assessment uncertainty seamounts population dynamics southeastern Pacific Chile Alfonsino (Beryx splendens) is a species associated with seamounts, with an important fishery in Juan Fernandez archipelago, Chile (33°40'S, 79°00'W). Since 2004, this resource has been managed by catch quotas estimated from stock assessment models. The alfonsino model involves high levels of uncertainty for several reasons including a lack of knowledge of aspects of the population dynamics and poorly informative time-series that feed the proposed evaluation models. This work evaluated three hypotheses regarding population dynamics and their influence on the main state variables (biomass, recruitment) of the model using age-structured and dynamic biomass models. The hypotheses corresponded to de-recruitment of older individuals, non-linearity between standardized catch per unit effort, and population abundance as well as variations of the relative importance of length structures. According to the results, the depletion of the spawning biomass between 1998 and 2008 varied between 9 and 56%, depending on the combination of hypotheses used in the model. This indicates that state variables in alfonsino are not robust to the available information; rather, they depend strongly on the hypothesis of population dynamics. The discussion is focused on interpreting the causes of the changes in the state variables in light of a conceptual model for population dynamics in alfonsino and which pieces of information would be necessary to reduce the associated uncertainty.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.1 20122012-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100019en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Beryx splendens stock assessment uncertainty seamounts population dynamics southeastern Pacific Chile
spellingShingle	Beryx splendens stock assessment uncertainty seamounts population dynamics southeastern Pacific Chile Wiff,Rodrigo Quiroz,Juan Carlos Gatica,Claudio Contreras,Francisco Paramo,Jorge Barrientos,Mauricio A Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
description	Alfonsino (Beryx splendens) is a species associated with seamounts, with an important fishery in Juan Fernandez archipelago, Chile (33°40'S, 79°00'W). Since 2004, this resource has been managed by catch quotas estimated from stock assessment models. The alfonsino model involves high levels of uncertainty for several reasons including a lack of knowledge of aspects of the population dynamics and poorly informative time-series that feed the proposed evaluation models. This work evaluated three hypotheses regarding population dynamics and their influence on the main state variables (biomass, recruitment) of the model using age-structured and dynamic biomass models. The hypotheses corresponded to de-recruitment of older individuals, non-linearity between standardized catch per unit effort, and population abundance as well as variations of the relative importance of length structures. According to the results, the depletion of the spawning biomass between 1998 and 2008 varied between 9 and 56%, depending on the combination of hypotheses used in the model. This indicates that state variables in alfonsino are not robust to the available information; rather, they depend strongly on the hypothesis of population dynamics. The discussion is focused on interpreting the causes of the changes in the state variables in light of a conceptual model for population dynamics in alfonsino and which pieces of information would be necessary to reduce the associated uncertainty.
author	Wiff,Rodrigo Quiroz,Juan Carlos Gatica,Claudio Contreras,Francisco Paramo,Jorge Barrientos,Mauricio A
author_facet	Wiff,Rodrigo Quiroz,Juan Carlos Gatica,Claudio Contreras,Francisco Paramo,Jorge Barrientos,Mauricio A
author_sort	Wiff,Rodrigo
title	Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
title_short	Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
title_full	Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
title_fullStr	Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
title_full_unstemmed	Uncertain population dynamic and state variables of alfonsino (Beryx splendens)
title_sort	uncertain population dynamic and state variables of alfonsino (beryx splendens)
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=S0718-560X2012000100019
work_keys_str_mv	AT wiffrodrigo uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens AT quirozjuancarlos uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens AT gaticaclaudio uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens AT contrerasfrancisco uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens AT paramojorge uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens AT barrientosmauricioa uncertainpopulationdynamicandstatevariablesofalfonsinoberyxsplendens
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Uncertain population dynamic and state variables of alfonsino (Beryx splendens)

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