Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)

Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)

A non-stationary state mass balance of the type advocated by the International Geosphere-Biosphere Programme/Land-Ocean Interactions in the Coastal Zone (IGBP/LOICZ) has been used to assess net ecosystem metabolism in the Pontevedra Ria (NW Spain), a large embayment subject to transient upwelling of...

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Principais autores: Dale, AW, Prego, R
Formato: Online
Idioma:eng
Publicado em: Iniversidad Autónoma de Baja California 2005
Acesso em linha:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/94
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spelling oai:cienciasmarinas.com.mx:article-942019-04-26T00:47:32Z Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin) Autotrofia y heterotrofia neta en un sistema costero de afloramiento, la Ría de Pontevedra Dale, AW Prego, R upwelling nutrient budget Pontevedra Ria NW Spain nutriente balance afloramiento ría Pontevedra NO de España A non-stationary state mass balance of the type advocated by the International Geosphere-Biosphere Programme/Land-Ocean Interactions in the Coastal Zone (IGBP/LOICZ) has been used to assess net ecosystem metabolism in the Pontevedra Ria (NW Spain), a large embayment subject to transient upwelling of Eastern North Atlantic Central Water (ENACW) under favourable meteorological conditions. Nitrate (NO3–) and phosphate (PO43–) data spanning 12 months were resolved at the oceanic boundary by treating the ria as a single box of constant volume. The nutrient budget was scaled up to an estimate of net community production (NCP) using the compositional relationship of local phytoplankton. The mean annual NCP predicted by the NO3– balance was 24.0 mgC m–2 h–1, and 35.8 mgC m–2 h–1 by the PO43– budget. Nutrient fluxes into the reservoir were strongly driven by the incoming oceanic flow throughout the year, which supplied 88% and 98% of the total NO3– and PO43– load, respectively. A high NCP (NO3–) of 57.2 mgC m–2 h–1 was calculated for the height of the growth season contemporaneous with ENACW intrusion, whereas a slightly higher value of 61.4 mgC m–2 h–1 corresponded to PO43–. Nutrient limitation was variable throughout the sampling, switching from PO43– to NO3– from winter to spring concurrent with a drop in riverine PO43– input. Scaling the inorganic nutrients to carbon units, the Pontevedra Ria may be considered as net autotrophic, although the NO3– budget suggests alternation between autotrophy and heterotrophy over an annual cycle. Se aplicó un balance no estacionario, siguiendo el modelo aconsejado por el programa IGBP-LOICZ, para calcular el metabolismo neto del ecosistema en la Ría de Pontevedra, un sistema costero sujeto a eventos de afloramiento de ENACW (Agua Central del Noreste Atlántico) bajo condiciones meteorológicas favorables. Para realizar dicho balance se utilizaron los datos de nitrato y fosfato obtenidos durante un lapso de doce meses en la frontera oceánica de la ría, considerada ésta como un único compartimento de volumen constante. Se estimó la producción neta (NCP, net community production) en base al balance de nutrientes y la composición elemental del fitoplancton local, obteniéndose un valor medio anual de 24.0 mgC m–2 h–1 en base al nitrato y de 35.8 mgC m–2 h–1 a partir del fosfato. El aporte de nutrientes hacia el compartimento fue muy dependiente del flujo entrante desde el océano a lo largo del año ya que éste contribuye con 88% y 98% del nitrato y fosfato total recibido, respectivamente. El máximo de NCP, 57.2 mgC m–2 h–1 en base al nitrato y 61.4 mgC m–2 h–1 partiendo del fosfato, se obtuvo durante la época de floraciones coetáneas a la intrusion de ENACW en la ría. La limitación de nutrientes fue variable durante todo el periodo de muestreo, cambiando del fosfato al nitrato desde el invierno hasta la primavera de acuerdo con la baja entrada de fosfato fluvial. Al convertir los nutrientes inorgánicos en unidades de carbono, la ría de Pontevedra puede ser considerada por su balance neto anual como autótrofa, aunque el balance de nitrato sugiere una alternancia entre autotrofía y heterotrofía durante el ciclo anual. Iniversidad Autónoma de Baja California 2005-03-06 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/94 10.7773/cm.v31i12.94 Ciencias Marinas; Vol. 31 No. 1B (2005); 213-220 Ciencias Marinas; Vol. 31 Núm. 1B (2005); 213-220 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/94/74
institution Ciencias Marinas
collection OJS
language eng
format Online
author Dale, AW
Prego, R
spellingShingle Dale, AW
Prego, R
Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
author_facet Dale, AW
Prego, R
author_sort Dale, AW
title Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
title_short Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
title_full Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
title_fullStr Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
title_full_unstemmed Net autotrophy and heterotrophy in the Pontevedra Ria upwelling system (NW Iberian margin)
title_sort net autotrophy and heterotrophy in the pontevedra ria upwelling system (nw iberian margin)
description A non-stationary state mass balance of the type advocated by the International Geosphere-Biosphere Programme/Land-Ocean Interactions in the Coastal Zone (IGBP/LOICZ) has been used to assess net ecosystem metabolism in the Pontevedra Ria (NW Spain), a large embayment subject to transient upwelling of Eastern North Atlantic Central Water (ENACW) under favourable meteorological conditions. Nitrate (NO3–) and phosphate (PO43–) data spanning 12 months were resolved at the oceanic boundary by treating the ria as a single box of constant volume. The nutrient budget was scaled up to an estimate of net community production (NCP) using the compositional relationship of local phytoplankton. The mean annual NCP predicted by the NO3– balance was 24.0 mgC m–2 h–1, and 35.8 mgC m–2 h–1 by the PO43– budget. Nutrient fluxes into the reservoir were strongly driven by the incoming oceanic flow throughout the year, which supplied 88% and 98% of the total NO3– and PO43– load, respectively. A high NCP (NO3–) of 57.2 mgC m–2 h–1 was calculated for the height of the growth season contemporaneous with ENACW intrusion, whereas a slightly higher value of 61.4 mgC m–2 h–1 corresponded to PO43–. Nutrient limitation was variable throughout the sampling, switching from PO43– to NO3– from winter to spring concurrent with a drop in riverine PO43– input. Scaling the inorganic nutrients to carbon units, the Pontevedra Ria may be considered as net autotrophic, although the NO3– budget suggests alternation between autotrophy and heterotrophy over an annual cycle.
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/94
_version_ 1715723933762715648

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