Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities

Detalhes bibliográficos
Autor(a) principal: Cunha, A.
Data de Publicação: 2006
Outros Autores: Almeida, A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/11269
Resumo: Marine bacterioplankton in the coastal region off Aveiro (NW Portugal) develop under the influence of the plume of a mesotrophic estuarine system (Ria de Aveiro) and, more recently, under the influence of the discharges of a marine sewage outfall (S. Jacinto). In an attempt to compare the degree of disturbance introduced by these 2 features to the abundance of sewage bacteria and heterotrophic activity of natural bacterioplankton, water samples were collected at 10 offshore and nearshore locations. Rates of ectoenzymatic activity and monomer incorporation were determined as proxies for potential heterotrophic activity of natural bacterial communities. ATP and chl a concentrations were used as estimates of the total abundance of phytoplankton. Faecal coliforms and total colony counts were used as indicators of sewage bacteria contamination. However, ATP, chl a, faecal coliforms, total colony counts, aminopeptidase activity and the maximum rate of leucine incorporation (leucine Vm) correlated negatively with linear distance to the mouth of the estuary, establishing the estuarine plume as an importance source of disturbance. Chl a, aminopeptidase activity and total colony counts also correlated negatively with linear distance to the sewage outfall, but no significant impact on the concentration of faecal bacteria could be detected. Compliance with the European Union Bathing Water Directive 76/160/EEC was achieved in 97% of samples. The ratio between β-glucosidase activity (polymer degradation) and glucose incorporation (monomer uptake) increased as the distance from the mouth of the estuary and from the sewage outfall increased. This indicates that, in addition to inputs of bacteria and nutrients, changes in the quality of the available organic substrates and/or sewage-related toxic effects may impose a shift in the functioning of heterotrophic bacterioplankton communities in this costal area.
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spelling Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communitiesMarine bacterioplanktonMarine outfallEstuarine plumeCoastal oceanMarine bacterioplankton in the coastal region off Aveiro (NW Portugal) develop under the influence of the plume of a mesotrophic estuarine system (Ria de Aveiro) and, more recently, under the influence of the discharges of a marine sewage outfall (S. Jacinto). In an attempt to compare the degree of disturbance introduced by these 2 features to the abundance of sewage bacteria and heterotrophic activity of natural bacterioplankton, water samples were collected at 10 offshore and nearshore locations. Rates of ectoenzymatic activity and monomer incorporation were determined as proxies for potential heterotrophic activity of natural bacterial communities. ATP and chl a concentrations were used as estimates of the total abundance of phytoplankton. Faecal coliforms and total colony counts were used as indicators of sewage bacteria contamination. However, ATP, chl a, faecal coliforms, total colony counts, aminopeptidase activity and the maximum rate of leucine incorporation (leucine Vm) correlated negatively with linear distance to the mouth of the estuary, establishing the estuarine plume as an importance source of disturbance. Chl a, aminopeptidase activity and total colony counts also correlated negatively with linear distance to the sewage outfall, but no significant impact on the concentration of faecal bacteria could be detected. Compliance with the European Union Bathing Water Directive 76/160/EEC was achieved in 97% of samples. The ratio between β-glucosidase activity (polymer degradation) and glucose incorporation (monomer uptake) increased as the distance from the mouth of the estuary and from the sewage outfall increased. This indicates that, in addition to inputs of bacteria and nutrients, changes in the quality of the available organic substrates and/or sewage-related toxic effects may impose a shift in the functioning of heterotrophic bacterioplankton communities in this costal area.Inter Research2013-10-17T10:57:40Z2006-01-01T00:00:00Z2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/11269eng0948-305510.3354/ame044253Cunha, A.Almeida, A.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:RCAAP2024-02-22T11:19:15Zoai:ria.ua.pt:10773/11269Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:47:22.926681Repositório 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 Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
title Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
spellingShingle Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
Cunha, A.
Marine bacterioplankton
Marine outfall
Estuarine plume
Coastal ocean
title_short Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
title_full Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
title_fullStr Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
title_full_unstemmed Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
title_sort Influence of an estuarine plume and marine sewage outfall on the dynamics of coastal bacterioplankton communities
author Cunha, A.
author_facet Cunha, A.
Almeida, A.
author_role author
author2 Almeida, A.
author2_role author
dc.contributor.author.fl_str_mv Cunha, A.
Almeida, A.
dc.subject.por.fl_str_mv Marine bacterioplankton
Marine outfall
Estuarine plume
Coastal ocean
topic Marine bacterioplankton
Marine outfall
Estuarine plume
Coastal ocean
description Marine bacterioplankton in the coastal region off Aveiro (NW Portugal) develop under the influence of the plume of a mesotrophic estuarine system (Ria de Aveiro) and, more recently, under the influence of the discharges of a marine sewage outfall (S. Jacinto). In an attempt to compare the degree of disturbance introduced by these 2 features to the abundance of sewage bacteria and heterotrophic activity of natural bacterioplankton, water samples were collected at 10 offshore and nearshore locations. Rates of ectoenzymatic activity and monomer incorporation were determined as proxies for potential heterotrophic activity of natural bacterial communities. ATP and chl a concentrations were used as estimates of the total abundance of phytoplankton. Faecal coliforms and total colony counts were used as indicators of sewage bacteria contamination. However, ATP, chl a, faecal coliforms, total colony counts, aminopeptidase activity and the maximum rate of leucine incorporation (leucine Vm) correlated negatively with linear distance to the mouth of the estuary, establishing the estuarine plume as an importance source of disturbance. Chl a, aminopeptidase activity and total colony counts also correlated negatively with linear distance to the sewage outfall, but no significant impact on the concentration of faecal bacteria could be detected. Compliance with the European Union Bathing Water Directive 76/160/EEC was achieved in 97% of samples. The ratio between β-glucosidase activity (polymer degradation) and glucose incorporation (monomer uptake) increased as the distance from the mouth of the estuary and from the sewage outfall increased. This indicates that, in addition to inputs of bacteria and nutrients, changes in the quality of the available organic substrates and/or sewage-related toxic effects may impose a shift in the functioning of heterotrophic bacterioplankton communities in this costal area.
publishDate 2006
dc.date.none.fl_str_mv 2006-01-01T00:00:00Z
2006
2013-10-17T10:57:40Z
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10.3354/ame044253
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dc.publisher.none.fl_str_mv Inter Research
publisher.none.fl_str_mv Inter Research
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