Sediment Quality and Possible Uses of Dredged Materials: The Ria De Aveiro Lagoon Mouth Area (Portugal)

Martins, Maria Virgínia Alves; Laut, Lázaro; Duleba, Wânia; Zaaboub, Noureddine; Aleya, Lotfi; Terroso, Denise; Sequeira, Cristina; Pena, Assane Luis; Rodrigues, Maria Antonieta da Conceição; Rocha, Fernando

doi:10.12957/jse.2017.30055

Cited by 6 publications

(6 citation statements)

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“…The higher values of SMGS are common in samples collected along the inlet and S. Jacinto channels where the tidal currents are stronger and reach frequently velocities >2 m s −1 [29], and in stations of other channels due to stronger currents activity in interaction with local topographic effects. Tidal currents affect not only the sediments' texture but also their chemical composition in Aveiro Lagoon [37,38]. The sediments are coarse-grained and have low organic matter content where the currents are strong.…”

Section: Discussion Of the Results Obtained In Aveiro Lagoonmentioning

confidence: 99%

Response of Benthic Foraminifera to Environmental Variability: Importance of Benthic Foraminifera in Monitoring Studies

Martins¹,

Yamashita²,

Sousa³

et al. 2019

Monitoring of Marine Pollution

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Foraminifera are eukaryotic unicellular microorganisms inhabiting all marine environments. The study of these protists has huge potential implications and benefits. They are good indicators of global change and are also promising indicators of the environmental health of marine ecosystems. Nevertheless, much remains to be learned about foraminiferal ecology. The goals of this chapter are (1) to provide a few examples from foraminifera studies, presenting possible use of foraminifera as bioindicators for the monitoring of transitional and marine ecosystems and (2) to highlight the importance of applying these organisms in environmental monitoring studies. A semienclosed coastal lagoon (Aveiro Lagoon; Portugal), an estuarine system (São Sebastião Channel; SE Brazil), a continental shelf sector (Campos Basin; SE Brazil), and a segment of continental slope (Campos Basin; SE Brazil) are used as examples.

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Section: Discussion Of the Results Obtained In Aveiro Lagoonmentioning

confidence: 99%

Response of Benthic Foraminifera to Environmental Variability: Importance of Benthic Foraminifera in Monitoring Studies

Martins¹,

Yamashita²,

Sousa³

et al. 2019

Monitoring of Marine Pollution

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“…Dredged and Undreged areas of the lagoon, following trends in Ria De Aveiro Lagoon in Portugal [28]. A plausible factor for this high level is associated with deposition of petroleum products from motorised out board engines by artisanal fishing folks into the water in both Dredge and Undredged areas.…”

Section: Discussionmentioning

confidence: 96%

Impact of Sand Dredging Activities on Ecosystem and Community Survival in Ibeshe Area of Lagos Lagoon, Nigeria

Adekunbi¹,

Elegbede²,

Akhiromen³

et al. 2018

GEP

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This study investigates the impact of sand dredging activities on coastal ecosystem and community survival around Ibeshe area of the Lagos Lagoon, Nigeria. Surface water and bottom sediment samples were collected from locations partitioned into Dredged Area (DA) and Undredged Area (UA) in the lagoon for laboratory analyses. Questionnaires were administered to community dwellers and sand miners to further analyze perception of locals. Significant differences in water quality parameters and sediments properties from Dredged and Undredged areas, and highly significant relationship between sand dredging and unsustainable ecological practices in Ibeshe were observed. One way ANOVA test indicates that all water quality parameters measured with exception of turbidity and nitrate concentration were not significantly different (P > 0.05) between Dredged and Undredged area. With exception of moisture content other sediment parameters measured were not significantly different (P > 0.05) between Dredged and Undredged areas. The project also determined the impact of dredging activities on the fisheries and fishing business in the environment. Turbidity values revealed that fishes will be negatively affected due to dredging activities; moreover dwellers pay little or no attention to conservation of the area due to unawareness. Sand dredging operations negatively influence ecological resources and water composition of the area. This project is designed to randomly sample the opinion of sand mining operators and residents; and questionnaires were administered to obtain data. Strict regulation and enforcement will assist to control ecological destruction and solve problems facing the lagoon environment.

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“…5). Aluminum concentrations are mainly associated with phyllosilicates (Martins et al, 2015b(Martins et al, , 2017, which are the main mineralogical component of the sediments of core SP6. This core was collected in a marginal area of the Guandú River delta front, probably in a protected zone, out of the high continental sediment load.…”

Section: Characteristics Of the Sediments Deposited Before And After mentioning

confidence: 99%

Impact of Eutrophication on Benthic Foraminifera in Sepetiba Bay (Rio De Janeiro State, Se Brazil)

et al. 2019

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The main objective of this work is to analyze the consequences of eutrophication in benthic meiofaunal organisms (foraminifera) in an internal area of Sepetiba Bay (State of Rio de Janeiro, SE, Brazil). This study is interesting because, at the studied site, the sediments corresponding to the period of greatest accumulation of organic matter were not contaminated by metals, although Sepetiba Bay has areas known to be polluted by this type of contaminants. Thus, in this study, it was possible to consider only the impact caused by eutrophication.In the SP6 core, collected in the Sepetiba Bay internal area and studied in this work, textural, geochemical (concentration of chemical elements; 210Pb and 137Cs; radiocarbon data) and foraminifera were analyzed in a muddy section, with a few intercalations of sandy layers. The sediments of the analyzed section were deposited in the last ≈2,350 BP years. The concentrations of Al, Cd, Co, Fe, Mn, Ni, Pb, Sn, Ti, V and Zn are higher at the base of the core and decrease towards the top. The contents of TOC, P and Zr have inverse paterns. The ratios of these elements to their background value have similar patterns. However, previous studies have recognized that during the twentieth century Cd, Zn, Cr and Pb concentrations increased in several areas of Sepetiba Bay, mainly due to industrial activity. The area where this core was collected may have been dredged. Radiocarbon ages suggest a loss of ≈2000 years of sedimentary registration, marked by an unconformity at a depth of 126 cm, probably caused by dredging. A new sedimentary sequence unpolluted by metals but highly enriched in organic matter was deposited on the surface of that discontinuity. Foraminifera were quite abundants in the lower section (240-126 cm; between ≈2,400-2,090 years BP, execept in the sandy layers), corresponding to sediment deposition before dredging. After dredging, the accumulation of very fine-grained sediments rich in organic matter generated eutrophication phenomena, which caused a drastic reduction in the abundance and diversity of these organisms. This work testifies the effect of eutrophication on meiofaunal organisms. Although some coastal foraminifer species tolerate harmful effects caused by eutrophication, it is recognized that the impact has been so negative that even these species occur with reduced abundance in the study area. IMPACTO DA EUTROFICAÇÃO EM FORAMINIFEROS BÊNTONICOS NA BAÍA DE SEPETIBA (ESTADO DO RIO DE JANEIRO, SE BRASIL) ResumoO principal objetivo deste trabalho é analisar as conseqüências da eutrofização em organismos meiofaunais bentônicos (foraminíferos) em uma área interna da Baía de Sepetiba (Estado do Rio de Janeiro, SE, Brasil). Este estudo é interessante porque, no local estudado, os sedimentos correspondentes ao período de maior acumulação de matéria orgânica, não estavam contaminados por metais, apesar da Baía de Sepetiba ter áreas reconhecidamente poluídas por este tipo de contaminantes. Assim neste estudo foi possível considerar apenas o impacto causado pela eutrofização.No testemunho SP6, coletado na área interna da Baía de Sepetiba e estudado neste trabalho, foram analisados dados texturais, geoquímicos (concentração de elementos químicos; 210Pb e 137Cs; dados de radiocarbono) e foraminíferos numa secção lamosa, com intercalações de camadas arenosas.Os sedimentos da seção analisada foram depositados nos últimos 2.350 anos BP. As concentrações de Al, Cd, Co, Fe, Mn, Ni, Pb, Sn, Ti, V e Zn são mais elevadas na base do testemunho e diminuem em direção ao topo. O conteúdo de TOC, P e Zr possui padrões inversos. As razões destes elementos com o respectivo valor de fundo possuem padrões semelhantes. Porém, estudos anteriores reconheceram em várias áreas da Baía de Sepetiba um aumento das concentrações de Cd, Zn, Cr e Pb durante o século XX, principalmente devido à atividade industrial. A área onde foi coletado este testemunho poderá ter sido dragada. As idades de radiocarbono sugerem uma perda de aproximadamente 2000 anos de registro sedimentar, marcada por uma inconformidade a 126 cm de profundidade, causada provavelmente por dragagem. Uma nova sequência sedimentar não poluída por metais, mas bastante enriquecida em matéria orgânica foi depositada sobre a superfície da descontinuidade. Os foraminíferos eram relativamente abundantes na seção inferior (240-126 cm; entre ≈2.400-2.090 anos BP), correspondente á deposição de sedimentos antes da dragagem. Após a dragagem, a acumulação de sedimentos muito finos e ricos em matéria orgânica, gerou fenómenos de eutrofização, que terão causado uma redução drástica da abundância e diversidade destes organismos. Este trabalho testemunha o efeito da eutrofização em organismos meiofaunais. Apesar de algumas espécies de foraminíferos costeiros tolerarem efeitos nefastos causados pela eutrofização, reconhece-se que o impacto foi tão negativo que mesmo estas espécies ocorrem com abundância reduzida na área estudada. Palavras-chave: Área Costeira. Registro Paleoambiental. Impacto Antrópico. Meiofauna, Abordagem Multiproxy.

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Sediment Quality and Possible Uses of Dredged Materials: The Ria De Aveiro Lagoon Mouth Area (Portugal)

Abstract: Sediment quality and possible uses of dredged materials: the Ria de Aveiro lagoon mouth area (Portugal). Journal of Sedimentary Environments, 2 (2): 149-166.

Cited by 6 publications

References 26 publications

Response of Benthic Foraminifera to Environmental Variability: Importance of Benthic Foraminifera in Monitoring Studies

Response of Benthic Foraminifera to Environmental Variability: Importance of Benthic Foraminifera in Monitoring Studies

Impact of Sand Dredging Activities on Ecosystem and Community Survival in Ibeshe Area of Lagos Lagoon, Nigeria

Impact of Eutrophication on Benthic Foraminifera in Sepetiba Bay (Rio De Janeiro State, Se Brazil)

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