Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific

The pattern of the spatial-temporal distribution of the fishing yields (catch rates) of swordfish {Xiphias gladius) from the Chilean industrial longline fleet it was determined using generalized additives models, autocorrelation analysis and Fourier spectral analysis. The basic information carne fro...

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Autores principales:	Espíndola,Fernando, Vega,Rodrigo, Yáñez,Eleuterio
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
Materias:	Xiphias gladius pelagic longline SST spatial-temporal pattern southeastern Pacific
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100004
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spelling	oai:scielo:S0718-560X20090001000042009-04-22Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern PacificEspíndola,FernandoVega,RodrigoYáñez,Eleuterio Xiphias gladius pelagic longline SST spatial-temporal pattern southeastern Pacific The pattern of the spatial-temporal distribution of the fishing yields (catch rates) of swordfish {Xiphias gladius) from the Chilean industrial longline fleet it was determined using generalized additives models, autocorrelation analysis and Fourier spectral analysis. The basic information carne from fishing log-book recorded by scientific observers between January 2001 and December 2005. The generalized additives models included five physical variables (latitude, longitude, date, lunar Índex and sea surface temperature (SST)), which affect the availability and vulnerability of swordfish, and two operational variables (length of the vessel and type of longline), which are directly associated with the effectiveness of the fishing system. The non-linear effects were established significantly (p < 0.01) for each of the independent variables. There was a typical annual cycle in the catch rates, with high values from March to July/August, and displacement of the fishing operation northward from the 38° to 32°S, in a SST range of 17° to 19°C. Subsequently, catch rates decrease in a northerly direction from 32°S in SST higher than 20°C. This spatial-temporal pattern was determinates with a high square coherency (79%) in the time series of nominal catch rates and latitudinal component analyzed in the Fourier spectral analysis. It also established for the time series of swordfish nominal catch rates, low-frequency fluctuations with periods of 28, 38 and 59 days. This intraseasonal variability in swordfish catch rates coincides with changes in mesoscale oceanographic conditions in the area where the fishery is developed off the coast of Chile.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.37 n.1 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100004en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Xiphias gladius pelagic longline SST spatial-temporal pattern southeastern Pacific
spellingShingle	Xiphias gladius pelagic longline SST spatial-temporal pattern southeastern Pacific Espíndola,Fernando Vega,Rodrigo Yáñez,Eleuterio Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
description	The pattern of the spatial-temporal distribution of the fishing yields (catch rates) of swordfish {Xiphias gladius) from the Chilean industrial longline fleet it was determined using generalized additives models, autocorrelation analysis and Fourier spectral analysis. The basic information carne from fishing log-book recorded by scientific observers between January 2001 and December 2005. The generalized additives models included five physical variables (latitude, longitude, date, lunar Índex and sea surface temperature (SST)), which affect the availability and vulnerability of swordfish, and two operational variables (length of the vessel and type of longline), which are directly associated with the effectiveness of the fishing system. The non-linear effects were established significantly (p < 0.01) for each of the independent variables. There was a typical annual cycle in the catch rates, with high values from March to July/August, and displacement of the fishing operation northward from the 38° to 32°S, in a SST range of 17° to 19°C. Subsequently, catch rates decrease in a northerly direction from 32°S in SST higher than 20°C. This spatial-temporal pattern was determinates with a high square coherency (79%) in the time series of nominal catch rates and latitudinal component analyzed in the Fourier spectral analysis. It also established for the time series of swordfish nominal catch rates, low-frequency fluctuations with periods of 28, 38 and 59 days. This intraseasonal variability in swordfish catch rates coincides with changes in mesoscale oceanographic conditions in the area where the fishery is developed off the coast of Chile.
author	Espíndola,Fernando Vega,Rodrigo Yáñez,Eleuterio
author_facet	Espíndola,Fernando Vega,Rodrigo Yáñez,Eleuterio
author_sort	Espíndola,Fernando
title	Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
title_short	Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
title_full	Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
title_fullStr	Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
title_full_unstemmed	Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific
title_sort	identification of the spatial-temporal distribution pattern of swordfish (xiphias gladius) in the southeastern pacific
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000100004
work_keys_str_mv	AT espindolafernando identificationofthespatialtemporaldistributionpatternofswordfishxiphiasgladiusinthesoutheasternpacific AT vegarodrigo identificationofthespatialtemporaldistributionpatternofswordfishxiphiasgladiusinthesoutheasternpacific AT yanezeleuterio identificationofthespatialtemporaldistributionpatternofswordfishxiphiasgladiusinthesoutheasternpacific
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Identification of the spatial-temporal distribution pattern of swordfish (Xiphias gladius) in the southeastern Pacific

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