Anna Sanchez-Vidal

Anna Sanchez-Vidal
University of Barcelona | UB · Department of Stratigraphy, Paleontology and Marine Geosciences

PhD

About

158
Publications
34,905
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Introduction
The main axis of my research is to characterise and quantify mass and energy fluxes on marine environments. Based on a detailed geochemical characterisation of settling particles and sediments, and the understanding of the external (climatic) and internal (oceanographic) forcing conditions to each studied environment (from the Southern Ocean to the Arctic), I aim at investigating the natural drivers of marine ecosystems, and the climate change and human induced impacts on them.
Additional affiliations
April 2006 - April 2008
French National Centre for Scientific Research
Position
  • Marie Curie Researcher

Publications

Publications (158)
Article
Full-text available
Research on plastic pollution has rapidly expanded in recent years and has led to the discovery of vast amounts of microplastics floating on the surface of subtropical oceanic gyres. However, the distribution of floating plastic in the ocean is still poorly constrained, and there is a lack of information from a few meters from the coastline where t...
Article
Investigating the transfer of particulate matter from the continental shelf to the deep basin is critical to understand the functioning of deep sea ecosystems. In this paper we present novel results on the temporal variability of particle fluxes to the deep in three physiographic domains of a 240 km long margin segment and nearby basin off Murcia a...
Article
Full-text available
Plastic debris provides long-lasting substrates for benthic organisms, thus acting as a potential vector for their dispersion. Its interaction with these colonizers is, however, still poorly known. This study examines fouling communities on beached, buoyant and benthic plastic debris in the Catalan Sea (NW Mediterranean), and characterizes the plas...
Article
Industrial seabed mining is expected to cause significant impacts on marine ecosystems, including physical disturbance and the generation of plumes of toxin-laden water. Portmán Bay (NW Mediterranean Sea), where an estimated amount of 60 Mt of mine tailings from sulphide ores were dumped from 1957 to 1990, is one of the most metal-polluted marine a...
Article
Full-text available
Portmán Bay in Southern Spain is one of the most extreme cases in Europe of anthropogenic impact on the marine ecosystem by the disposal of mine tailings resulting from the processing of sulphide ores. First, the composition and extent of the surficial deposit were investigated from geochemical and metal analysis on high spatial density of sediment...
Article
Full-text available
Physical and biogeochemical processes in the Southern Ocean are fundamental for modulating global climate. In this context, a process-based understanding of how Antarctic diatoms control primary production and carbon export, and hence global-ocean carbon sequestration, has been identified as a scientific priority. Here we use novel sediment trap ob...
Article
Full-text available
Quantitative knowledge about the burial of sedimentary components at the seafloor has wide-ranging implications in ocean science, from global climate to continental weathering. The use of ²³⁰Th-normalized fluxes reduces uncertainties that many prior studies faced by accounting for the effects of sediment redistribution by bottom currents and minimi...
Article
Full-text available
Sinking particles are a critical conduit for the export of organic material from surface waters to the deep ocean. Despite their importance in oceanic carbon cycling, little is known about the biotic composition and seasonal variability of sinking particles reaching abyssal depths. Herein, sinking particle flux data, collected in the deep Ierapetra...
Article
Full-text available
The seafloor covers some 70% of the Earth's surface and has been recognized as a major sink for marine litter. Still, litter on the seafloor is the least investigated fraction of marine litter, which is not surprising as most of it lies in the deep sea, i.e. the least explored ecosystem. Although marine litter is considered a major threat for the o...
Article
Full-text available
There is strong evidence that the seafloor constitutes a final sink for plastics from land sources. There is also evidence that part of the plastics lying on the shallow seafloor are washed up back to the shoreline. However, little is known on the natural trapping processes leading to such landwards return. Here we investigate microplastics and lar...
Chapter
Submarine canyons are deep, large-scale incisions that occur on the continental shelf and slope of all ocean margins. These landforms serve as preferential particle-transport conduits that connect the coastal zone with the deep-sea. Canyons have been studied for decades and are among the most iconic submarine geomorphic features. Advances in marine...
Article
We analyzed litter occurrence in 68 underwater video transects performed on the middle/outer continental shelf and submarine canyon off Cap de Creus (NW Mediterranean), an area recently declared Site of Community Importance (SCI). Low densities of urban litter were registered on the shelf (7.2 items ha−1), increasing in abundance towards the deepes...
Article
Full-text available
Involving and engaging stakeholders is crucial for studying and managing the complex interactions between marine ecosystems and human health and wellbeing. The Oceans and Human Health Chair was founded in the town of Roses (Catalonia, Spain, NW Mediterranean) in 2018, the fruit of a regional partnership between various stakeholders, and for the pur...
Poster
Full-text available
Study area and objectives Preliminary results Preliminary conclusions Material and methods Acnkowledgements This work has been carried out in the framework of the Spanish RTD project NUREIEVA (ref. CTM2016-75953-C2-1-R). CRG on Marine Geosciences is recognized by Generalitat de Catalunya in its program for excellence research groups (ref. 2017 SGR...
Article
Portmán Bay is one of the most contaminated and chronically impacted coastal marine areas of the world. Here, from the 1957 to 1990, about 60 million tons of mine tailings from the processing of sulfide ores were dumped directly at the shoreline. The resulting deposit provides a unique opportunity to assess the impact of mine tailings on coastal ma...
Article
X-ray fluorescence core scanners (XRF-CS) allow rapid, non-destructive, continuous and high-resolution analyses of the elemental composition of sediment cores, providing large sets of semi-quantitative data. These data can be converted to quantitative data through the linear regression approach using a relatively small number of discrete samples an...
Article
Copious quantities of microplastics enter the sewage system on a daily basis, and hence wastewater treatment plants (WWTPs) could be an important source of microplastic pollution in coastal waters. Influent and effluent discharges from three WWTPs in Mersin Bay, Turkey were sampled at monthly intervals over a one-year period during 2017. When data...
Chapter
Based on remotely operated vehicle video imaging, we describe a cold-water coral habitat in La Fonera canyon head (northwestern Mediterranean Sea) and the human impacts which threat this habitat. The dominant cold-water coral species is Madrepora oculata along with Dendrophyllia cornigera. The first occur on highly sloping rocky outcrops most frequ...
Article
Full-text available
Mining impacts on coastal environments have been extensively studied around the world. However, the role of Submarine Groundwater Discharge (SGD) and Porewater Exchange (PEX) as pathways for pollutants from mining waste deposits into seawater has been largely overlooked. Portmán Bay is located in the Cartagena-La Unión Pb-Zn sulphur mining district...
Article
Pollution by large-sized plastics and microplastic debris is widespread in all Earth environments, also threatening marine ecosystems worldwide. In this study we determine the load of microplastics in the Western Mediterranean Sea and evaluate their aggregation potential into marine aggregates. We report average microplastic abundances of 0.10 ± 0....
Article
Full-text available
Here we investigate the sensitivity of deep-water formation in the north-western Mediterranean Sea to climate variability during the last 2500 yr. With this purpose, the grain-size parameter UP10 (fraction > 10 μm) is used as a proxy for intensity of deep-water circulation. Such a proxy is first validated through the analysis of oceanographic data...
Technical Report
Full-text available
The JRC exploratory project RIMMEL provides information about litter, mainly plastic waste, entering the European Seas through river systems. RIMMEL has collected data on riverine floating macro litter inputs to the sea. Data acquisition was based on the Riverine Litter Observation Network (RiLON) activities, which collected data from rivers in the...
Article
Full-text available
Pollution of the marine environment by large and microscopic plastic fragments and their potential impacts on organisms has stimulated considerable research interest and has received widespread publicity. However, relatively little attention has been paid to the fate and effects of microplastic particles that are fibrous in shape, also referred as...
Data
Details of sampling location and quantity (microfibres per 50 ml of sediment, MF50) and type (polymer) of fibres found. (DOCX)
Article
Full-text available
High-latitude regions are warming faster than other areas due to reduction of snow cover and sea ice loss and changes in atmospheric and ocean circulation. The combination of these processes, collectively known as polar amplification, provides an extraordinary opportunity to document the ongoing thermal destabilisation of the terrestrial cryosphere...
Article
A detailed study of 15 sediment cores from Blanes Canyon and its immediate surroundings (NW Mediterranean Sea) was conducted to compare historic sedimentation rates and evaluate the possible impact of bottom-trawling intensification on the sedimentary regimes over the past 50 years. The canyon axis and flanks, as well as the adjacent open slope, we...
Article
Full-text available
High latitude regions are warming faster than other areas due to reduction of snow cover, sea ice loss, changes in atmospheric and ocean circulation. The combination of these processes, collectively known as polar amplification, provides an extraordinary opportunity to document the ongoing thermal destabilisation of the terrestrial cryosphere and t...
Poster
A comprehensive study of 15 sediment cores from the Blanes Canyon area was conducted to understand natural sedimentary processes and alterations caused by bottom trawling. Canyon axis and flanks, as well as adjacent open slope areas were sampled at depths ranging from 300 m to 2200 m. Grain size, dry bulk density and 210Pb concentration profiles we...
Article
Full-text available
In January 2017, the International Seabed Authority released a discussion paper on the development of Environmental Regulations for deep-sea mining (DSM) within the Area Beyond National Jurisdiction (the “Area”). With the release of this paper, the prospect for commercial mining in the Area within the next decade has become very real. Moreover, wit...
Article
Numerous organisms, including both passive sinkers and active migrators, are captured in sediment traps together with sediments. By capturing these “swimmers”, the traps become an extraordinarily tool to obtain relevant information on the biodiversity and dynamics of deep-sea organisms. Here we analyze near-bottom swimmers larger than 500 μm and th...
Article
Settling particles were collected by a set of moored sediment traps deployed during one year in the western Gulf of Lion along Cap de Creus and Lacaze-Duthiers submarine canyons and on the adjacent southern open slope. These traps collected particles during periods of pelagic settling and also during events of deep water flushing by dense shelf wat...
Chapter
Submarine canyons are deep incisions observed along most of the world’s continental margins. Their topographic relief is as dramatic as that of any canyon or river valley on land but is hidden beneath the surface of the ocean. Our knowledge of canyons has therefore come primarily from remote sensing and sampling, and has involved contributions from...
Article
Information on the dynamics of deep-sea biota is extremely scant particularly for long-term time series on deep-sea zooplankton. Here, we present the results of a deep-sea zooplankton investigation over one annual cycle based on samples from sediment trap moorings in three sub-basins along the Mediterranean Sea. Deep-sea zooplankton assemblages wer...
Article
Nature Ecology & Evolution 1 , 0144 (2017); published 24 April 2017; corrected 22 May 2017. In the original version of this Article Rut Pedrosa-Pàmies's name was listed incorrectly.
Article
Portmán Bay is a heavily contaminated area resulting from decades of metal mine tailings disposal, and is considered a suitable shallow-water analogue to investigate the potential ecotoxicological impact of deep-sea mining. Resuspension plumes were artificially created by removing the top layer of the mine tailings deposit by bottom trawling. Musse...
Chapter
The western Mediterranean Sea includes several archipelagos of which the largest ones are, from west to east, the Baleares (Balearics Islands) and the Corsica and Sardinia block. The sea area between Sardinia and Sicily represents the transition from the western Mediterranean Sea to the Ligurian and Ionian seas. The continental shelves of the weste...
Article
Submarine volcanic eruptions are major catastrophic events that allow investigation of the colonization mechanisms of newly formed seabed. We explored the seafloor after the eruption of the Tagoro submarine volcano off El Hierro Island, Canary Archipelago. Near the summit of the volcanic cone, at about 130 m depth, we found massive mats of long, wh...
Article
With increasing demand for mineral resources, extraction of polymetallic sulphides at hydrothermal vents, cobalt-rich ferromanganese crusts at seamounts, and polymetallic nodules on abyssal plains may be imminent. Here, we shortly introduce ecosystem characteristics of mining areas, report on recent mining developments, and identify potential stres...
Article
Continental shelves are recognized to play a key role in the biogeochemical cycle of carbon, linking terrestrial and marine carbon reservoirs. In this study we investigate the physical and biogeochemical processes that control the source, transport and fate of organic carbon (OC) in the continental shelf off Barcelona city, in the NW Mediterranean...
Conference Paper
Full-text available
The ocean response to atmospheric forcing is critical to many oceanographic processes. Data on air temperature, heat and buoyancy losses, and water temperature from winter 2005 allowed detecting the formation of dense water in the NW Mediterranean Sea, both on the continental shelf and offshore, which led to cascading and open sea convection, respe...
Poster
Full-text available
The present work aims at understanding the synchronous response of oceanographic processes in the Cantabrian Sea (southern Bay of Biscay) and the Gulf of Lion (NW Mediterranean Sea) as a consequence of atmospheric forcing.
Poster
Full-text available
OBJECTIVE: Integrate analyses of changes in deep and surface marine conditions and atmosphere in the central western Mediterranean region during the last 2700 years through the join geochemical and sedimentological analyses of marine sediment cores and cave speleothems from the Balearic sector. Instrumental measurements of deep sea currents are als...
Poster
Western Mediterranean Deep Water (WMDW) forms in the Gulf of Lion by the action of winter cold and dry winds. Here we analyse ocean-atmosphere linkages in this region for the last 2.7 kyr. Ocean conditions are evaluated in base to a group of sediment cores from the North Minorca drift and atmospheric conditions in base to speleothem records from a...
Article
The transport and fate of organic matter (OM) sources within the Avilés submarine canyon (Cantabrian Sea, Southern Bay of Biscay) were studied using carbon and nitrogen stable isotope ratios. The isotopic composition of settling particles and deep bottom sediments closely resembled that of surface particulate OM, and there were no marked difference...
Article
Full-text available
Long-term biogeochemical observations are critical to understand the natural ability of the oceans to fix CO2 into organic carbon and export it to the deep as sinking particles. Here we present results from a three-year (2010-13) sediment trap deployment that allowed to detect interannual variations of carbon fluxes beyond 4000 m depth in the Easte...
Poster
Full-text available
We present a detailed multibeam bathymetry mapping of the Avilés submarine canyon system carried out in the frame of the Spanish DOS MARES research project, jointly with a year-round (March 2012 to April 2013) monitoring of environmental variables and particle fluxes. Remote sensing images and meteorological and hydrographical data are also incorpo...
Article
Full-text available
We assess the occurrence and extent of cold-water coral (CWC) species Madrepora oculata and Dendrophyllia cornigera, as well as gorgonian red coral Corallium rubrum, in La Fonera canyon head (Northwestern Mediterranean Sea), as well as human impacts taking place in their habitats. Occurrence is assessed based on Remotely Operated Vehicle (ROV) vide...
Data
Jackknife tests of variable importance. For each plot, red bar indicates the total gain when all variables are used; blue bars indicate the gain when each environmental variable is used in isolation, the highest gains indicating the variables that appear to have the most useful information by themselves; and green bars indicate the gain when the en...
Data
ROV images depicting substrate types in the study area. Location in Fig 1. A: Rock outcrops covered by a very thin mud veneer at the foot of Illa Negra western wall (306 mwd, footwall). B: Rock outcrop in the western wall of Illa Negra branch (246 mwd, near-vertical wall), with sponges Poecillastra compressa, Hamacantha cf falcula, polychaete Vermi...
Data
ROV images depicting cold-water and red coral colonies in the study area. Location in Fig 1. A: Dense overhanging M. oculata living colonies at the foot of Cap de Begur eastern wall (205 m, near-vertical wall). B: M. oculata and D. cornigera living colonies at the foot of Cap de Begur eastern wall (236 m, footwall). C: M. oculata and D. cornigera l...
Data
Examples of cold-water and red coral colonies in the study area. Most examples image the largest colonies in Cap de Begur branch (transects 16, 17, 20 and 22) as well as the only large one observed in Illa Negra branch (transect 9). Other occurrences in the canyon are smaller in size. Note also that some images example dead coral rubble in the vici...
Data
ROV images depicting cold-water and red coral colonies in the study area. Location in Fig 1. A: Living colony of M. oculata growing on lost fishing gear, with ophiurioid Ophiothrix sp., polychaetes S. pavonina and Vermiliopsis sp., oyster N. cochlear and sponge Reniera sp. (279 m, gentle slope). B: D. cornigera isolated polyp, together with sponge...
Data
Examples of litter observed on the seafloor of the study area. Location in Fig 1. A: Longline entangled on M. oculata colonies located on a rock outcrop near the axis of Cap de Begur branch (369 m, near-vertical wall). B: Longlines and ropes entangled on the rocks of the western wall of Illa Negra branch, with M. oculata colonies (194 m, steep slop...
Data
ROV images depicting substrate types in the study area. Location in Fig 1. A: Bioclastic sand on the eastern wall of the canyon close to Sant Sebastià fishing ground (226 mwd, gentle slope), with Octopus salutii and hydrarians. B: Muddy bottom along the axis of Cap de Begur branch with L. conchilega (387 mwd, footwall). C: Muddy bottom along the ax...
Data
Compressed file including spreadsheet with all observations and bathymetric-derived parameters, and text file with instructions. (ZIP)
Data
Examples of human impacts in the study area. These include litter (plastics and other garbage, and entangled nets and longlines), increased sediment loads and trawling marks. (AVI)
Article
The Avilés Canyon in the central Cantabrian margin is one of the largest submarine canyons in Europe, extending from the shelf edge at 130 m depth to 4765 m depth in the Biscay abyssal plain. In this paper we present the results of a year-round (from March 2012 to April 2013) study of particle fluxes in this canyon and the adjacent continental slop...
Article
Full-text available
Surface sediments collected from deep slopes and basins (1018-4087 m depth) of the oligotrophic Eastern Mediterranean Sea have been analysed for bulk elemental and isotopic composition of organic carbon, total nitrogen and selected lipid biomarkers, jointly with grain size distribution and other geochemical proxies. The distribution and sources of...
Conference Paper
Full-text available
We review and provide semiquantitative analysis of the most significant anthropogenic impacts that affect submarine canyons in the western Mediterranean Sea within three categories: marine litter, microplastics, and emerging pollutants. The analysis shows the existence of links between high-energy oceanographic processes such as dense shelf water c...