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Title

Nutrient fluxes to the Bay of Biscay from Cantabrian rivers (Spain)

Other TitlesFlux de nutriments du bassin versant Cantabrique au golfe de Gascogne
AuthorsPrego, R. ; Vergara, Javier
KeywordsNitrate
Phosphate
Silicate
River
Cantabrian coast
Issue Date1998
PublisherElsevier
CitationOceanologica Acta 21(2): 271-278 (1998)
Abstract[EN] Nutrient fluxes to the Bay of Biscay from the Cantabrian basin have been quantified for the first time. Data between 1981 and 1995 of the main 16 Cantabrian rivers from the COCA monitoring programme have been used. Values of water flow and dissolved inorganic nitrogen (DIN), phosphate and silicate concentrations have been taken. Equations are proposed to quantify the fluvial nutrient contributions to the Cantabrian Sea. The annual average of continental outputs to the Bay of Biscay from the Cantabrian basin is 16.1 x 109m30f freshwater, 1.0 x IO9 mol of N in DIN, 0.062 x lo9 mol of phosphate and 1.2 x lo9 mol of silicate. In comparison with the French rivers, those of the Cantabrian have small fluxes and their outflow is very disperse, not forming large coastal plumes. From April to September, when the primary production is relatively important, the DIN contribution to the Cantabrian coastal reservoir is 10 %. Coastal fertilisation due to continental waters could be considered as negligible and only influences areas very close to river mouths, except for the Naldn River. Its flux represents 33 % of nitrate, 39 % of phosphate and 15 % of silicate of the total continental inputs of nutrients to the Cantabrian Sea.
[FR] Nutrient fluxes to the Bay of Biscay from the Cantabrian basin have been quantified for the first time. Data between 1981 and 1995 of the main 16 Cantabrian rivers from the COCA monitoring programme have been used. Values of water flow and dissolved inorganic nitrogen (DIN), phosphate and silicate concentrations have been taken. Equations are proposed to quantify the fluvial nutrient contributions to the Cantabrian Sea. The annual average of continental outputs to the Bay of Biscay from the Cantabrian basin is 16.1 x 109m30f freshwater, 1.0 x IO9 mol of N in DIN, 0.062 x lo9 mol of phosphate and 1.2 x lo9 mol of silicate. In comparison with the French rivers, those of the Cantabrian have small fluxes and their outflow is very disperse, not forming large coastal plumes. From April to September, when the primary production is relatively important, the DIN contribution to the Cantabrian coastal reservoir is 10 %. Coastal fertilisation due to continental waters could be considered as negligible and only influences areas very close to river mouths, except for the Naldn River. Its flux represents 33 % of nitrate, 39 % of phosphate and 15 % of silicate of the total continental inputs of nutrients to the Cantabrian Sea.
Description8 páginas, 3 tablas, 4 figuras
Publisher version (URL)http://dx.doi.org/10.1016/S0399-1784(98)80014-5
URIhttp://hdl.handle.net/10261/58765
DOI10.1016/S0399-1784(98)80014-5
ISSN0399-1784
Appears in Collections:(IIM) Artículos
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