Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)

Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)

Concentrations of 16 PCB congeners, pp'-DDT and its metabolites (DDE and DDD) and lipid content were determined in Crassostrea angulata. The oysters were collected monthly from a natural ground of the upper Sado Estuary, from November 1987 to November 1988, and between January and December 1990...

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Hlavní autoři: Ferreira, AM, Vale, C
Médium: Online
Jazyk:eng
Vydáno: Iniversidad Autónoma de Baja California 2001
On-line přístup:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/459
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spelling oai:cienciasmarinas.com.mx:article-4592019-05-09T19:51:32Z Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal) Variaciones estacionales e interanuales de los contenidos de PCB y DDT en el ostión Crassostrea angulata del Estuario de Sado (Portugal) Ferreira, AM Vale, C PCBs DDT and metabolites bioaccumulation oyster Crassostrea angulata PCB DDT y metabolitos bioacumulación ostión Crassostrea angulata Concentrations of 16 PCB congeners, pp'-DDT and its metabolites (DDE and DDD) and lipid content were determined in Crassostrea angulata. The oysters were collected monthly from a natural ground of the upper Sado Estuary, from November 1987 to November 1988, and between January and December 1990. The same compounds were also analysed in suspended particulate matter samples collected at the same site with the same periodicity. In 1987/88, the suspended particulate matter contained uniformly low levels of pp'-DDT and its metabolites (1–5 ng g–1), except in the winter runoff period when DDT compounds reached 48 ng g–1. The river flows remained low throughout 1990 and no seasonal variation of DDT contents was found in the suspended particulate matter. Concentrations of PCBs as the sum of congeners remained within the narrow interval of 5–12 ng g–1 in the two years. The seasonal profiles of DDT and PCB compounds in oysters were characterized by the presence of a spring peak associated with the sexual cycle, and another maximum in winter. The winter peak in 1987/88 results from the input of particles enriched in DDT and the downward displacement of the maximum turbidity zone, whereas the 1990 peak was related to nutritional alterations. These results show that the accumulation pattern of organochlorines in oysters varied seasonally and inter-annually according to the timing of environmental and biological factors. Se determinaron las concentraciones de 16 congéneres de PCB, de pp'-DDT y sus metabolitos (DDE y DDD) y el contenido de lípidos en Crassostrea angulata. Los ostiones fueron recolectados mensualmente de un banco natural en la parte superior del estuario de Sado, de noviembre de 1987 a noviembre de 1988 y de enero a diciembre de 1990. Estos compuestos también fueron analizados en muestras de materia particulada en suspensión, recolectadas en el mismo sitio y durante los mismos periodos. En 1987/88, el material particulado en suspensión tuvo niveles uniformemente bajos de pp'-DDT y sus metabolitos (1–5 ng g–1), excepto en el periodo de descarga fluvial de invierno, cuando los compuestos de DDT alcanzaron 48 ng g–1. Los flujos del río permanecieron bajos durante todo 1990 y no se encontró ninguna variación estacional en los contenidos de DDT de la materia particulada en suspensión. Las concentraciones de los PCBs como la suma de los congéneres permaneció dentro de un estrecho intervalo de 5 a 12 ng g–1, durante los dos años. Los perfiles estacionales de los componentes de DDT y PCB en los ostiones se caracterizaron por la presencia de un pico máximo en la primavera, asociado con el ciclo sexual, y de otro máximo en invierno. El máximo de invierno en 1987/88 resulta de la entrada de partículas enriquecidas en DDT y del desplazamiento estuario abajo de la zona de turbidez máxima, mientras que el pico máximo de 1990 se relacionó con alteraciones en la nutrición. Estos resultados muestran que el modelo de acumulación de los compuestos organoclorados en los ostiones varió estacional e interanualmente de acuerdo con la cronología de los factores ambientales y biológicos. Iniversidad Autónoma de Baja California 2001-03-06 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/459 10.7773/cm.v27i2.459 Ciencias Marinas; Vol. 27 No. 2 (2001); 255-268 Ciencias Marinas; Vol. 27 Núm. 2 (2001); 255-268 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/459/398
institution Ciencias Marinas
collection OJS
language eng
format Online
author Ferreira, AM
Vale, C
spellingShingle Ferreira, AM
Vale, C
Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
author_facet Ferreira, AM
Vale, C
author_sort Ferreira, AM
title Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
title_short Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
title_full Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
title_fullStr Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
title_full_unstemmed Seasonal and inter-annual variations of PCB and DDT contents in the oyster Crassostrea angulata from the Sado Estuary (Portugal)
title_sort seasonal and inter-annual variations of pcb and ddt contents in the oyster crassostrea angulata from the sado estuary (portugal)
description Concentrations of 16 PCB congeners, pp'-DDT and its metabolites (DDE and DDD) and lipid content were determined in Crassostrea angulata. The oysters were collected monthly from a natural ground of the upper Sado Estuary, from November 1987 to November 1988, and between January and December 1990. The same compounds were also analysed in suspended particulate matter samples collected at the same site with the same periodicity. In 1987/88, the suspended particulate matter contained uniformly low levels of pp'-DDT and its metabolites (1–5 ng g–1), except in the winter runoff period when DDT compounds reached 48 ng g–1. The river flows remained low throughout 1990 and no seasonal variation of DDT contents was found in the suspended particulate matter. Concentrations of PCBs as the sum of congeners remained within the narrow interval of 5–12 ng g–1 in the two years. The seasonal profiles of DDT and PCB compounds in oysters were characterized by the presence of a spring peak associated with the sexual cycle, and another maximum in winter. The winter peak in 1987/88 results from the input of particles enriched in DDT and the downward displacement of the maximum turbidity zone, whereas the 1990 peak was related to nutritional alterations. These results show that the accumulation pattern of organochlorines in oysters varied seasonally and inter-annually according to the timing of environmental and biological factors.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/459
_version_ 1715723970868674560

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