Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms

Detalhes bibliográficos
Autor(a) principal: Lillebø, A. I.
Data de Publicação: 2007
Outros Autores: Teixeira, H., Pardal, M. A., Marques, J. C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/5331
https://doi.org/10.1016/j.ecss.2006.10.012
Resumo: The Mondego estuary is a well-described polyhaline type of transitional water located at the North Atlantic Ocean Ecoregion, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to huge productivity of Ulva spp. Zostera noltii meadows were severely reduced causing the whole ecosystem to become impoverished in terms of macrofaunal abundance, biomass and species richness with a concomitant lowering of secondary production. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient rich freshwater inflow, to reverse the process in the most affected area of the estuary - its south arm. Thus, the system quality status was assessed before and after 1998, over a ten year period. The OSPAR comprehensive procedure, the first phase of the US-NEEA procedure and the proposed EU-WFD physicochemical status criteria were applied to the data before and after the modifications and all show that the system health has improved. Nonetheless, the annual means of the oxidised forms of nitrogen and of phosphate were not reduced. In fact, applying criteria used in classifying the nutrient levels in transitional waters and the Baltic sea trophic condition, the system has not improved. Meaning that, to look forward to a "higher" quality status, future measures should also consider longer term solutions such as improved agriculture practices in the Mondego River valley through environmental friendly technological solutions that will reduce the nutrient loads to this system.
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spelling Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptomseutrophicationtransitional watersquality statusestuaryThe Mondego estuary is a well-described polyhaline type of transitional water located at the North Atlantic Ocean Ecoregion, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to huge productivity of Ulva spp. Zostera noltii meadows were severely reduced causing the whole ecosystem to become impoverished in terms of macrofaunal abundance, biomass and species richness with a concomitant lowering of secondary production. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient rich freshwater inflow, to reverse the process in the most affected area of the estuary - its south arm. Thus, the system quality status was assessed before and after 1998, over a ten year period. The OSPAR comprehensive procedure, the first phase of the US-NEEA procedure and the proposed EU-WFD physicochemical status criteria were applied to the data before and after the modifications and all show that the system health has improved. Nonetheless, the annual means of the oxidised forms of nitrogen and of phosphate were not reduced. In fact, applying criteria used in classifying the nutrient levels in transitional waters and the Baltic sea trophic condition, the system has not improved. Meaning that, to look forward to a "higher" quality status, future measures should also consider longer term solutions such as improved agriculture practices in the Mondego River valley through environmental friendly technological solutions that will reduce the nutrient loads to this system.http://www.sciencedirect.com/science/article/B6WDV-4MGVJC1-2/1/03fe02fbee910b8a14bda9085a80f06e2007info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/5331http://hdl.handle.net/10316/5331https://doi.org/10.1016/j.ecss.2006.10.012engEstuarine, Coastal and Shelf Science. 72:1-2 (2007) 177-187Lillebø, A. I.Teixeira, H.Pardal, M. A.Marques, J. C.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2021-11-17T14:17:00Zoai:estudogeral.uc.pt:10316/5331Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:37.399676Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
title Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
spellingShingle Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
Lillebø, A. I.
eutrophication
transitional waters
quality status
estuary
title_short Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
title_full Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
title_fullStr Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
title_full_unstemmed Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
title_sort Applying quality status criteria to a temperate estuary before and after the mitigation measures to reduce eutrophication symptoms
author Lillebø, A. I.
author_facet Lillebø, A. I.
Teixeira, H.
Pardal, M. A.
Marques, J. C.
author_role author
author2 Teixeira, H.
Pardal, M. A.
Marques, J. C.
author2_role author
author
author
dc.contributor.author.fl_str_mv Lillebø, A. I.
Teixeira, H.
Pardal, M. A.
Marques, J. C.
dc.subject.por.fl_str_mv eutrophication
transitional waters
quality status
estuary
topic eutrophication
transitional waters
quality status
estuary
description The Mondego estuary is a well-described polyhaline type of transitional water located at the North Atlantic Ocean Ecoregion, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to huge productivity of Ulva spp. Zostera noltii meadows were severely reduced causing the whole ecosystem to become impoverished in terms of macrofaunal abundance, biomass and species richness with a concomitant lowering of secondary production. In 1998, experimental mitigation measures were implemented, via changes in hydrology to increase circulation and diversion of nutrient rich freshwater inflow, to reverse the process in the most affected area of the estuary - its south arm. Thus, the system quality status was assessed before and after 1998, over a ten year period. The OSPAR comprehensive procedure, the first phase of the US-NEEA procedure and the proposed EU-WFD physicochemical status criteria were applied to the data before and after the modifications and all show that the system health has improved. Nonetheless, the annual means of the oxidised forms of nitrogen and of phosphate were not reduced. In fact, applying criteria used in classifying the nutrient levels in transitional waters and the Baltic sea trophic condition, the system has not improved. Meaning that, to look forward to a "higher" quality status, future measures should also consider longer term solutions such as improved agriculture practices in the Mondego River valley through environmental friendly technological solutions that will reduce the nutrient loads to this system.
publishDate 2007
dc.date.none.fl_str_mv 2007
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/5331
http://hdl.handle.net/10316/5331
https://doi.org/10.1016/j.ecss.2006.10.012
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https://doi.org/10.1016/j.ecss.2006.10.012
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dc.relation.none.fl_str_mv Estuarine, Coastal and Shelf Science. 72:1-2 (2007) 177-187
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