Nutrient concentrations in coastal waters: Impact of the Guadiana River
Water samples were collected over an area of 900 km2 adjacent to the outflow of the Guadiana River in January 1999 to characterize the concentrations and spatial distribution of nutrients (ammonium, nitrite, nitrate, phosphate and silicate) in the water column. The purpose of the study was to char...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
2003-03-01
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| Series: | Ciencias Marinas |
| Subjects: | |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/167 |
| _version_ | 1797279397211799552 |
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| author | A Cravo M Madureira F Rita AJ Silva MJ Bebianno |
| author_facet | A Cravo M Madureira F Rita AJ Silva MJ Bebianno |
| author_sort | A Cravo |
| collection | DOAJ |
| description |
Water samples were collected over an area of 900 km2 adjacent to the outflow of the Guadiana River in January 1999 to characterize the concentrations and spatial distribution of nutrients (ammonium, nitrite, nitrate, phosphate and silicate) in the water column. The purpose of the study was to characterize a winter situation of low discharge in terms of nutrient concentrations in the coastal area adjacent to the Guadiana outflow, before the reduction of the river flow due to the completion of the Alqueva Dam. The results show that the maximum influence of the Guadiana outflow was close to the mouth of the Guadiana River, where the highest nutrient concentrations and the minimum of salinity were registered. At the surface, the nutrient concentrations decreased gradually as the distance from the coast increased. The influence of the Guadiana outflow at the surface, despite being small, was evident in the area of about 90 km2 that extends westwards from the mouth of the river. In this area, the increase in N compounds was more significant than in P and Si. The vertical influence of the outflow of the Guadiana River, until over the isobath lower than 30 m, was reflected in nutrient concentrations that decreased with the increase in depth. However, when the depth of the water column was greater than 30 m, the nutrient concentrations increased with the increase in depth. It is expected that with the completion of the Alqueva Dam, the outflow of the Guadiana River will be reduced even further. Nutrient concentrations will also be reduced and the influence of the river in the coastal zone will be even smaller. This could have a negative impact on the nutrient biogeochemical cycles and on the overall productivity of the area.
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| first_indexed | 2024-03-07T16:24:44Z |
| format | Article |
| id | doaj.art-8191d8a58bec457f90c120a9ad8a346c |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:24:44Z |
| publishDate | 2003-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-8191d8a58bec457f90c120a9ad8a346c2024-03-03T19:18:15ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532003-03-0129410.7773/cm.v29i4.167Nutrient concentrations in coastal waters: Impact of the Guadiana RiverA Cravo0M Madureira1F Rita2AJ Silva3MJ Bebianno4University of AlgarveUniversity of AlgarveUniversity of AlgarveHydrographic Institute, Oceanographic DivisionUniversity of Algarve Water samples were collected over an area of 900 km2 adjacent to the outflow of the Guadiana River in January 1999 to characterize the concentrations and spatial distribution of nutrients (ammonium, nitrite, nitrate, phosphate and silicate) in the water column. The purpose of the study was to characterize a winter situation of low discharge in terms of nutrient concentrations in the coastal area adjacent to the Guadiana outflow, before the reduction of the river flow due to the completion of the Alqueva Dam. The results show that the maximum influence of the Guadiana outflow was close to the mouth of the Guadiana River, where the highest nutrient concentrations and the minimum of salinity were registered. At the surface, the nutrient concentrations decreased gradually as the distance from the coast increased. The influence of the Guadiana outflow at the surface, despite being small, was evident in the area of about 90 km2 that extends westwards from the mouth of the river. In this area, the increase in N compounds was more significant than in P and Si. The vertical influence of the outflow of the Guadiana River, until over the isobath lower than 30 m, was reflected in nutrient concentrations that decreased with the increase in depth. However, when the depth of the water column was greater than 30 m, the nutrient concentrations increased with the increase in depth. It is expected that with the completion of the Alqueva Dam, the outflow of the Guadiana River will be reduced even further. Nutrient concentrations will also be reduced and the influence of the river in the coastal zone will be even smaller. This could have a negative impact on the nutrient biogeochemical cycles and on the overall productivity of the area. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/167nutrientsGuadiana Rivercoastal watersAlqueva Dam |
| spellingShingle | A Cravo M Madureira F Rita AJ Silva MJ Bebianno Nutrient concentrations in coastal waters: Impact of the Guadiana River Ciencias Marinas nutrients Guadiana River coastal waters Alqueva Dam |
| title | Nutrient concentrations in coastal waters: Impact of the Guadiana River |
| title_full | Nutrient concentrations in coastal waters: Impact of the Guadiana River |
| title_fullStr | Nutrient concentrations in coastal waters: Impact of the Guadiana River |
| title_full_unstemmed | Nutrient concentrations in coastal waters: Impact of the Guadiana River |
| title_short | Nutrient concentrations in coastal waters: Impact of the Guadiana River |
| title_sort | nutrient concentrations in coastal waters impact of the guadiana river |
| topic | nutrients Guadiana River coastal waters Alqueva Dam |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/167 |
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