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Article . 2009
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Identificación del patrón de distribución espacio-temporal del pez espada (Xiphias gladius) en el océano Pacífico suroriental.

Authors: Espíndola, F.; Vega, R.; Yáñez, E.;

Identificación del patrón de distribución espacio-temporal del pez espada (Xiphias gladius) en el océano Pacífico suroriental.

Abstract

Se determinó el patrón de distribución espacio-temporal de los rendimientos de pesca (tasa de captura) de pez espada (Xiphias gladius) de la flota palangrera industrial chilena, mediante el uso de modelos aditivos generalizados, análisis de autocorrelación y análisis espectral de Fourier. La información base provino de bitácoras de pesca registradas por observadores científicos entre enero de 2001 y diciembre de 2005. En los modelos aditivos generalizados se incluyeron cinco variables físicas (latitud, longitud, fecha, temperatura superficial del mar (TSM) y el índice lunar), que afectarían la disponibilidad y vulnerabilidad del pez espada, y dos variables operacionales (largo del barco y tipo de palangre), que se asociarían directamente con la efectividad del sistema de pesca. Los efectos no lineales fueron establecidos significativamente (p < 0,01) para cada una de las variables independientes. Se observó un ciclo anual característico en la tasa de captura, con valores elevados de marzo a julio-agosto, y desplazamientos de la operación de pesca de sur a norte de 38~’ a 32~’S, en un rango de TSM de 17~’ a 19~’C. Posteriormente, los rendimientos disminuyeron en dirección norte desde los 32°S con TSM mayores a 20~’C. Este patrón espacio-temporal fue determinado con una alta coherencia cuadrada (79%) en las series temporales de las tasas de captura nominal y la componente latitudinal analizadas en el análisis espectral de Fourier. Además, para la serie temporal de la tasa de captura nominal se establecieron fluctuaciones de baja frecuencia con períodos de 28, 38 y 59 días. Esta variabilidad intraestacional en la tasa de captura coincide con las variaciones en las condiciones oceanográficas de mesoescala en la zona donde se desarrolla la pesquería frente a la costa de Chile. 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 came from fishing logbook recorded by scientific observers between January 2001 and December 2005. The generalized additives models included five physical variables (latitude, longitude, date, lunar index 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. Published

Keywords

Xiphias gladius, Biogeography, High frequency, Pattern recognition, Pelagic fisheries

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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