Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles

Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles

The spatial distribution of the yellowfin tuna (Thunnus albacares) abundance in the Eastern Pacific Ocean was studied from commercial catches by the Mexican tuna-fishing fleet. Concentration profiles were carried out as indicators of a realtionship between catch-per-unit effort (CPUE) and fish abund...

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Autores principales: Sosa-López, A, Manzo-Monroy, HG
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2002
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/241
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spelling oai:cienciasmarinas.com.mx:article-2412019-04-29T21:17:58Z Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles Patrones espaciales del atún aleta amarilla (Tunnus albacares) en el Océano Pacífico Oriental: una exploración de perfiles de concentración Sosa-López, A Manzo-Monroy, HG Yellowfin tuna Eastern Pacific Ocean spatial patterns concentration profiles generalized additive models Atún aleta amarilla Oceano Pacífico Oriental patrones espaciales perfiles de concentración modelos aditivos generalizados The spatial distribution of the yellowfin tuna (Thunnus albacares) abundance in the Eastern Pacific Ocean was studied from commercial catches by the Mexican tuna-fishing fleet. Concentration profiles were carried out as indicators of a realtionship between catch-per-unit effort (CPUE) and fish abundance for the period from 1992 to 1996. Spatial and temporal resolution "units" were defined by means of a semi-variogram and serial correlation analyses, respectively. The unit resolutions obtained for catch data were 1 × 1 degree (spatial) and monthly (temporal). Catch values were standardized by means of robust regression. Fish resource spatial distribution patterns were identified and estimated catch-values were obtained with Generalized Additive Models. From these estimates, a CPUE time-space matrix CPUE was defined with 60 months and 1029 locations. Nine timespace patterns explained more than 80% of the variability. Individual spatial patterns were analyzed and spatial regions were defined with homogeneous CPUE values. Similarities between the CPUE and the concentration profiles (covered area) suggest that the CPUE-relative abundance relationship is not directly proportional which indicates hyperdepletion processes. Fishery management implications are also discussed in this study. Se estudio la distribución espacial de abundancia de atún aleta amarilla (Thunnus albacares) en el Océano Pacífico Oriental, a partir de las capturas comerciales de la flota atunera mexicana. Se obtuvieron perfiles de concentración de 1992 a 1996 como indicadores de la relación entre captura por unidad de esfuerzo (CPUE) y abundancia de peces. Se definieron "unidades" de resolución espacial y temporal por medio de una semivariograma y análisis de correlación de series, respectivamente, obteniendo para los datos de captura resoluciones unitarias de un 1 × 1 grado (espacial) y un mes (temporal), para posteriormente estandarizarlos con una regresión robusta. Se identificaron patrones de distribución espacial y, por medio de Modelos Aditivos Generalizados, se estimaron valores de captura. Con estas estimaciones se definió una matriz espacio-temporal de CPUE con 60 meses y 1029 sitios. Nueve patrones temporales explicaron más del 80% de la variabilidad. Se analizó cada patrón temporal y se definieron regiones espaciales con CPUEs homogéneas. Las similitudes entre CPUE y perfiles de concentración (area de cobertura) sugieren que la relación CPUE-abundancia relativa no es directamente proporcional, lo que indica procesos de hiperagotamiento. Se discuten también las implicaciones de ésto en el manejo de la pesquería. Iniversidad Autónoma de Baja California 2002-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/241 10.7773/cm.v28i4.241 Ciencias Marinas; Vol. 28 No. 4 (2002); 331-346 Ciencias Marinas; Vol. 28 Núm. 4 (2002); 331-346 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/241/204
institution Ciencias Marinas
collection OJS
language eng
format Online
author Sosa-López, A
Manzo-Monroy, HG
spellingShingle Sosa-López, A
Manzo-Monroy, HG
Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
author_facet Sosa-López, A
Manzo-Monroy, HG
author_sort Sosa-López, A
title Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
title_short Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
title_full Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
title_fullStr Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
title_full_unstemmed Spatial patterns of the yellowfin tuna (Thunnus albacares) in the Eastern Pacific Ocean: an exploration of concentration profiles
title_sort spatial patterns of the yellowfin tuna (thunnus albacares) in the eastern pacific ocean: an exploration of concentration profiles
description The spatial distribution of the yellowfin tuna (Thunnus albacares) abundance in the Eastern Pacific Ocean was studied from commercial catches by the Mexican tuna-fishing fleet. Concentration profiles were carried out as indicators of a realtionship between catch-per-unit effort (CPUE) and fish abundance for the period from 1992 to 1996. Spatial and temporal resolution "units" were defined by means of a semi-variogram and serial correlation analyses, respectively. The unit resolutions obtained for catch data were 1 × 1 degree (spatial) and monthly (temporal). Catch values were standardized by means of robust regression. Fish resource spatial distribution patterns were identified and estimated catch-values were obtained with Generalized Additive Models. From these estimates, a CPUE time-space matrix CPUE was defined with 60 months and 1029 locations. Nine timespace patterns explained more than 80% of the variability. Individual spatial patterns were analyzed and spatial regions were defined with homogeneous CPUE values. Similarities between the CPUE and the concentration profiles (covered area) suggest that the CPUE-relative abundance relationship is not directly proportional which indicates hyperdepletion processes. Fishery management implications are also discussed in this study.
publisher Iniversidad Autónoma de Baja California
publishDate 2002
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/241
_version_ 1715723946112843776

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