Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity

Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity

 Silicates, nitrates, phosphates, chlorophyll a and primary productivity were monitored at low and high tide between September 1985 and September 1986, at four stations in Ria Formosa, a meso-tidal coastal lagoon located in the south of Portugal. The water sampling and the in situ observati...

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Autores principales: Falcao, M, Vale, C
Formato: Online
Idioma:eng
Publicado em: Iniversidad Autónoma de Baja California 2003
Acesso em linha:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/173
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spelling oai:cienciasmarinas.com.mx:article-1732019-04-24T18:55:22Z Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity Dinámica de nutrientes en una laguna costera (Ría Formosa, Portugal): La importancia del intercambio de agua laguna–mar en la productividad biológica Falcao, M Vale, C Coastal lagoon nutrients chlorophyll primary productivity lagoon-sea exchanges Laguna costera nutrientes clorofila productividad primaria intercambios laguna-mar  Silicates, nitrates, phosphates, chlorophyll a and primary productivity were monitored at low and high tide between September 1985 and September 1986, at four stations in Ria Formosa, a meso-tidal coastal lagoon located in the south of Portugal. The water sampling and the in situ observations were done alternatively in neap and spring tide. While silicates at low tide exceeded values at high tide thorughout the year and a weak seasonal trend was discerned, nitrates and phosphates exhibited a clear-cut seasonal variation at high spring tide. Pronounced maxima in the period of low temperatures (early spring), 7 µM of nitrates and 3 µM of phosphates, indicate their import from the adjacent coastal zone. Lower values at low tide and chlorophyll a increases (up to 2 µg g–1) point to a rapid biological consumption of the imported nutrients. Differences of temperature between coastal waters and those of the lagoon in early spring account for the more efficient consumption by the primary producers of the lagoon. The primary productivity varied from 2 mg C m–3 h–1 (winter) to 30 mg C m–3 h–1 (summer), reflecting the intensive 14C incorporation during the warmer period. High rates of nitrates and phosphates consumption could be observed during spring, when their concentrations decreased 50% within a narrow period of 6 hours from high to low tide. Se monitorearon silicatos, nitratos, fosfatos, clorofila a y productividad primaria en mareas altas y bajas entre septiembre de 1985 y septiembre de 1986, en cuatro estaciones en la Ría Formosa, una laguna costera meso-mareal localizada en el sur de Portugal. Las muestras de agua y las observaciones in situ se realizaron en mareas muertas y vivas, de forma alternada. Mientras que durante la marea baja los silicatos excedieron los valores obtenidos en marea alta durante todo el año, estableciéndose una débil tendencia estacional, los nitratos y fosfatos mostraron una notoria variación estacional durante la pleamar de las mareas vivas. Los máximos pronunciados en el periodo de bajas temperaturas (inicios de primavera), de 7∞M para nitratos y 3 ∞M para fosfatos, indican su advección desde la zona costera contigua. Los valores menores durante la marea baja y el incremento en la clorofila a (hasta 2 mg g–1), señalan un rápido consumo biológico de los nutrientes importados. Las diferencias de temperatura entre las aguas costeras, y las de la laguna al inicio de la primavera, promueven un consumo más eficiente entre los productores primarios de la laguna. La productividad primaria varió de 2 mg C m–3 h–1 (invierno) a 30 mg C m–3 h–1 (verano), reflejando una intensa incorporación de 14C durante los periodos cálidos. Se pudo observar una elevada tasa de consumo de nitratos y fosfatos durante la primavera, cuando las concentraciones disminuyeron en un 50% dentro de un corto período de 6 horas entre pleamar y bajamar. Iniversidad Autónoma de Baja California 2003-03-06 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/173 10.7773/cm.v29i4.173 Ciencias Marinas; Vol. 29 No. 4 (2003); 425-433 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 425-433 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/173/148
institution Ciencias Marinas
collection OJS
language eng
format Online
author Falcao, M
Vale, C
spellingShingle Falcao, M
Vale, C
Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
author_facet Falcao, M
Vale, C
author_sort Falcao, M
title Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
title_short Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
title_full Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
title_fullStr Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
title_full_unstemmed Nutrient dynamics in a coastal lagoon (Ria Formosa, Portugal): The importance of lagoon–sea water exchanges on the biological productivity
title_sort nutrient dynamics in a coastal lagoon (ria formosa, portugal): the importance of lagoon–sea water exchanges on the biological productivity
description  Silicates, nitrates, phosphates, chlorophyll a and primary productivity were monitored at low and high tide between September 1985 and September 1986, at four stations in Ria Formosa, a meso-tidal coastal lagoon located in the south of Portugal. The water sampling and the in situ observations were done alternatively in neap and spring tide. While silicates at low tide exceeded values at high tide thorughout the year and a weak seasonal trend was discerned, nitrates and phosphates exhibited a clear-cut seasonal variation at high spring tide. Pronounced maxima in the period of low temperatures (early spring), 7 µM of nitrates and 3 µM of phosphates, indicate their import from the adjacent coastal zone. Lower values at low tide and chlorophyll a increases (up to 2 µg g–1) point to a rapid biological consumption of the imported nutrients. Differences of temperature between coastal waters and those of the lagoon in early spring account for the more efficient consumption by the primary producers of the lagoon. The primary productivity varied from 2 mg C m–3 h–1 (winter) to 30 mg C m–3 h–1 (summer), reflecting the intensive 14C incorporation during the warmer period. High rates of nitrates and phosphates consumption could be observed during spring, when their concentrations decreased 50% within a narrow period of 6 hours from high to low tide.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/173
_version_ 1715723938898640896

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