A multiproxy approach of the Holocene evolution of shelf–slope circulation on the NW Iberian Continental Shelf

Martins, V.; Dubert, Jesús; Jouanneau, Jean-Marie; Weber, O.; Silva, Eduardo Ferreira da; Patinha, Carla; Dias, João Alveirinho; Rocha, Fernando

doi:10.1016/j.margeo.2006.11.001

Cited by 119 publications

(105 citation statements)

References 57 publications

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“…The direct comparison of our specimens with the specimens of Mendes (2010) led us to conclude that both belong to the same species and thus Mendes' (2010) identification criteria were adopted. Bolivina ordinaria distribution within the Guadiana Estuary was surprising, as it is primarily described as an abundant species at great depths on the Portuguese continental shelf (Mendes et al, 2004;Martins et al, 2006Martins et al, , 2007Mendes, 2010). Mendes (2010) considered B. ordinaria as a ubiquitous, very abundant species, highly adaptable and tolerant to a wide range of different factors or combination of factors, living at two different continental-shelf depth ranges (25-100 m in the southeast and 20-60 m in the northwest Gulf of Cadiz), and strongly associated with the direct influence of river discharges.…”

Section: Middle Estuarymentioning

confidence: 99%

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

Camacho

Moura

Connor

et al. 2015

Palaeontologia Electronica

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Section: Middle Estuarymentioning

confidence: 99%

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

Camacho

Moura

Connor

et al. 2015

Palaeontologia Electronica

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“…Similarly, hypoxic bottom water has developed intermittently in the deep basins of Baltic Sea for thousands of years as a result of climatic forcing, and has been overprinted by human influences only in recent decades (Zillén et al, 2008;Conley et al, 2009). In open-shelf settings, similar changes have arisen from alterations in the hydrodynamic regime related ultimately to climatic forcing, for example, on the northwestern Iberian shelf (Martins et al, 2007) and off Oregon (Grantham et al, 2004).…”

Section: Natural Versus Anthropogenic Drivers Of Hypoxiamentioning

confidence: 99%

Historical records of coastal eutrophication-induced hypoxia

Jorissen²,

et al. 2009

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Abstract. Under certain conditions, sediment cores from coastal settings subject to hypoxia can yield records of environmental changes over time scales ranging from decades to millennia, sometimes with a resolution of as little as a few years. A variety of biological and geochemical indicators (proxies) derived from such cores have been used to reconstruct the development of eutrophication and hypoxic conditions over time. Those based on (1) the preserved remains of benthic organisms (mainly foraminiferans and ostracods), (2) sedimentary features (e.g. laminations) and (3) sediment chemistry and mineralogy (e.g. presence of sulphides and redox-sensitive trace elements) reflect conditions at or close to the seafloor. Those based on (4) the preserved remains of planktonic organisms (mainly diatoms and dinoflagellates), (5) pigments and lipid biomarkers derived from prokaryotes and eukaryotes and (6) organic C, N and their stable isotope ratios reflect conditions in the water column. However, the interpretation of these indicators is not straightforward. A central difficulty concerns the fact that hypoxia is strongly correlated with, and often induced by, organic enrichment caused by eutrophication, making it difficult to separate the effects of these phenomena in sediment records. The problem is compounded by the enhanced preservation in anoxic and hypoxic sediments of organic microfossils and biomarkers indicating eutrophication. The use of hypoxiaCorrespondence to: A. J. Gooday (ang@noc.soton.ac.uk) specific proxies, such as the trace metals molybdenum and rhenium and the bacterial biomarker isorenieratene, together with multi-proxy approaches, may provide a way forward. All proxies of bottom-water hypoxia are basically qualitative; their quantification presents a major challenge to which there is currently no satisfactory solution. Finally, it is important to separate the effects of natural ecosystem variability from anthropogenic effects. Despite these problems, in the absence of historical data for dissolved oxygen concentrations, the analysis of sediment cores can provide plausible reconstructions of the temporal development of humaninduced hypoxia, and associated eutrophication, in vulnerable coastal environments.

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“…To obtain the mineralogical data, X-Ray Diffraction (XRD) techniques were applied, according to the methodology described by Martins et al (2007). Geochemical analysis was performed by ICP-MS (Inductively Coupled Plasma Mass Spectrometry) after multi-acid digestion of the sediments (HCl+HNO3+HF).…”

Section: Mineralogical and Geochemical Analysesmentioning

confidence: 99%

Sediments Quality and Potential Uses of Dredged Material: A Case Study (Portugal)

et al. 2017

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A multiproxy approach of the Holocene evolution of shelf–slope circulation on the NW Iberian Continental Shelf

Cited by 119 publications

References 57 publications

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

Taxonomy, ecology and biogeographical trends of dominant benthic foraminifera species from an Atlantic-Mediterranean estuary (the Guadiana, southeast Portugal)

Historical records of coastal eutrophication-induced hypoxia

Sediments Quality and Potential Uses of Dredged Material: A Case Study (Portugal)

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