Nutrient retention in the sediments and the submerged aquatic vegetation of the coastal lagoon of the Ria de Aveiro, Portugal

Silva, José Figueiredo da; Duck, R. W.; Catarino, J. B.

doi:10.1016/j.seares.2009.06.007

Cited by 21 publications

(13 citation statements)

References 33 publications

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“…Considering the entire Ria de Aveiro system, there was an apparent decrease in seagrass meadows extent from 300 ha in 2002–2004, recorded by Silva et al . 31 , to 226 ha in 2014, as obtained in the present study. However, it must be mentioned that Silva et al .…”

Section: Discussionsupporting

confidence: 80%

“…However, it must be mentioned that Silva et al . 31 data included macroalgae areas adjacent to Z. noltei , and not only Z. noltei as performed in the 2014 survey. Seagrass meadows located at the Ovar channel were accounted for by Silva et al .…”

Section: Discussionmentioning

confidence: 99%

“…Azevedo et al . 27 summarized the available seagrass data for Ria de Aveiro, describing a decrease in coverage in the last decades 31,32 , and mentioning that by 2008 and 2010, in Mira and Ovar channels 28 , respectively, Zostera noltei (dwarf eelgrass) was restricted to intertidal areas. Nevertheless, these studies focused on confined seagrass meadows within Ria de Aveiro.…”

Section: Methodsmentioning

confidence: 99%

“…loss of Zostera marina Linnaeus, 1753, Stuckenia pectinata (L.) Börner, 1912, and Ruppia cirrhosa (Petagna) Grande, 1918), the loss of subtidal Zostera noltei Hornemann, 1832 meadows and reduction of its intertidal meadows 27,28 . The main causes for seagrass decline in Ria de Aveiro were changes in the lagoon hydrodynamics 29–31 , particularly those resulting from harbour related activities (main driving forces) 29 . These activities resulted in the increase of hydromorphological pressures in the lagoon due to dredging of navigable channels, and in changes of hydrodynamic features, such as increased tidal amplitude and current velocity 30–33 .…”

Section: Introductionmentioning

confidence: 99%

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Blue Carbon stock in Zostera noltei meadows at Ria de Aveiro coastal lagoon (Portugal) over a decade

Sousa

Silva

Azevedo

et al. 2019

Sci Rep

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This work assessed the Blue Carbon (C) stock in the seagrass meadows (Zostera noltei) of Ria de Aveiro coastal lagoon (Portugal), and evaluated its spatio-temporal trend over the 2003–2005 to 2013–2014 period. Zostera noltei spatial distribution, restricted to intertidal areas in 2014, was mapped by remote sensing using an unmanned aerial vehicle (UAV) and aerial photography. Zostera noltei biomass was also monitored in situ over a year and its Blue C stock was estimated. By 2014, intertidal meadows covered an area of 226 ± 4 ha and their Blue C stock ranged from 227 ± 6 to 453 ± 13 Mg C. Overall, Ria de Aveiro Z. noltei intertidal meadows increased in extent over the 2003–2005 to 2013–2014 period, corroborating the recent declining trend reversal observed in Europe and contrary to the global decline trend. This spatio-temporal shift might be related to a natural adjustment of the intertidal meadows to past human intervention in Ria de Aveiro, namely large-scale dredging activities, particularly in the 1996–1998 period, combined with the more accurate assessment performed in 2014 using the UAV. This recovery contributes to the effective increase of the Blue C stock in Ria de Aveiro and, ultimately, to supporting climate regulation and improving ecosystem health. However, major dredging activities are foreseen in the system’s management plan, which can again endanger the recovery trend of Z. noltei intertidal meadows in Ria de Aveiro.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Blue Carbon stock in Zostera noltei meadows at Ria de Aveiro coastal lagoon (Portugal) over a decade

Sousa

Silva

Azevedo

et al. 2019

Sci Rep

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“…However, major transformations in the pools of organic and inorganic nutrients that reach the lagoon are related to biological processes associated with bacteria-plankton (Cunha et al 2003a, b). This contributes to the accumulation of fine sediment particles (silt and clay) and organic matter (Figueiredo da Silva et al 2009). This contributes to the accumulation of fine sediment particles (silt and clay) and organic matter (Figueiredo da Silva et al 2009).…”

Section: Sedimentary Processes and Metal Retention/mobilizationmentioning

confidence: 99%

Early diagenesis and clay mineral adsorption as driving factors of metal pollution in sediments: the case of Aveiro Lagoon (Portugal)

Martins

Mané

Frontalini

et al. 2015

Environ Sci Pollut Res

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This work aims to define the factors driving the accumulation of metals in the sediment of the lagoon of Aveiro (Portugal). The role of initial diagenetic processes in controlling trace metal retention in surface sediment is traced by mineralogy, magnetic susceptibility and geochemical analyses. Although several studies have focused on the metal distribution in this polihaline and anthropized coastal lagoon, most of them have been solely focused on the total metal concentrations. This study instead represents the first attempt to evaluate in a vast area of the Aveiro Lagoon the role of biogeochemical processes in metal availability and distribution in three extracted phases: exchangeable cations adsorbed by clay and elements co-precipitated with carbonates (S1), organic matter (S2) and amorphous Mn hydroxides (S3). According to the sediment guideline values, the sediment is polluted by, for instance, As and Hg in the inner area of the Murtosa Channel, Pb in the Espinheiro Channel, Aveiro City canals and Aveiro Harbour, and Zn in the northern area of the Ovar Channel. These sites are located near the source areas of pollutants and have the highest total available concentrations in each extracted phase. The total available concentrations of all toxic metals are however associated, firstly, with the production of amorphous Mn hydroxides in most of the areas and, secondly, with adsorption by organic compounds. The interplay of the different processes implies that not all of the sites near pollution sources have polluted surface sediment. The accumulation of metals depends on not only the pollution source but also the changing in the redox state of the sediments that may cause alterations in the sediment retention or releasing of redox-sensitive metals. Results of this work suggest that the biogeochemical processes may play a significant role in the increase of the pollutants in the sediment of the Aveiro Lagoon.

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Advances in Modeling of Water Quality in Estuaries

Kenov

Campuzano

Franz

et al. 2014

Remote Sensing and Modeling

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Nutrient retention in the sediments and the submerged aquatic vegetation of the coastal lagoon of the Ria de Aveiro, Portugal

Cited by 21 publications

References 33 publications

Blue Carbon stock in Zostera noltei meadows at Ria de Aveiro coastal lagoon (Portugal) over a decade

Blue Carbon stock in Zostera noltei meadows at Ria de Aveiro coastal lagoon (Portugal) over a decade

Early diagenesis and clay mineral adsorption as driving factors of metal pollution in sediments: the case of Aveiro Lagoon (Portugal)

Advances in Modeling of Water Quality in Estuaries

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