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Location of the Fundão tailing dam (Mariana, Brazil) and the path taken by the tailings until reaching the sea. The Aquatic Biodiversity Monitoring Program (ABMP-ES) monitoring area is highlighted at the Doce River and adjacent marine region.
Contexts in source publication
Context 1
... Fundão tailing dam failure generated a spill of 39.2 million m 3 of tailings into the Gualaxo do Norte River (Minas Gerais) (Fig. 1). As the massive slur of tailing moved downriver, it caused immediate death of entire fish populations when the slurry buried them or clogged their gills (Fernandes et al., 2016). Of the total volume, about 20.3 million m 3 was held at the Risoleta Neves Hydroelectric Plant Dam (Doce River). The iron ore tailings reached the Doce River ...
Context 2
... Fundão tailing dam failure generated a spill of 39.2 million m 3 of tailings into the Gualaxo do Norte River (Minas Gerais) (Fig. 1). As the massive slur of tailing moved downriver, it caused immediate death of entire fish populations when the slurry buried them or clogged their gills (Fernandes et al., 2016). Of the total volume, about 20.3 million m 3 was held at the Risoleta Neves Hydroelectric Plant Dam (Doce River). The iron ore tailings reached the Doce River ...
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... The mud tailings traveled more than 600 km and reached the Doce River's mouth, creating a tailing plume that dispersed along the coast [13]. About 10 years later, environmental consequences are still observed in the area, including the MPA sediment and biota [14]. Seabed relict morphology, combined with Holocene carbonate sedimentation and low sediment input, creates a complex geodiversity in the area. ...
... The CDs are distributed along the mapped area, occupying distinct morphological aspects imprinted by the shelf valleys and the flat area between the valleys (inter-valleys; Figures 2,4,and 5). The CDs are mainly distributed within three distinct morphologies: valley edges (CD01, 02, and 06), inter-valleys (CD08, 10,13,14,15), and valley flanks (CD19 and CD20) ( Figure 5). ...
... A synthesis of the interpretation of the acoustic response combined with the findings from bottom images and sediment sampling is presented for the 11 sampled CDs (Tables 2-5, Figure 7). The CDs are mainly distributed within three distinct morphologies: valley edges (CD01, 02, and 06), inter-valleys (CD08, 10,13,14,15), and valley flanks (CD19 and CD20) ( Figure 5). A synthesis of the interpretation of the acoustic response combined with the findings from bottom images and sediment sampling is presented for the 11 sampled CDs (Table 2, Figure 7, Tables 3-5). ...
Initiatives such as the United Nations Decade of Ocean Science for Sustainable Development and Seabed 2030 promote seabed mapping worldwide. In Brazil, especially on the Espírito Santo Continental Shelf, high-resolution seabed mapping has revealed an unknown complex seascape. Circular depressions (CDs) were mapped for the first time in the Costa das Algas Marine Protection Area. Herein, we aim to present the CD metrics characteristics and discuss their relationship with morphology and relevance as a habitat based on multibeam bathymetry and ground truthing. A total of 3660 depressions were mapped between 46 and 85 m in depth, reaching an area of 460 m2 and 5 m relief. The continental shelf morphology was subdivided into three sectors based on morphology: inter-valleys, valley edges, and valley flanks, and eleven sites were selected for direct sampling/imaging at the CDs along the sectors. The direct sampling was carried out by scuba-diving with video images and sediment samples collected inside and outside the depressions. The deeper central parts of the circular depressions appear to function as a sink, presenting aggregations of rhodoliths or other carbonate fragments. In most inter-valley depressions, mounds were observed along the edges of the depression. We did not have any indication of gas seeps and no clear sedimentological or morphological control on their occurrence. We first hypothesize that their origin results from combined diachronous processes. The circular depressions mapped at high resolution could be related to sea level processes acting during the last glacial period and shelf exposure, i.e., relict features. The CDs are responsible for biomass aggregation and fish bioturbation, forming holes and rubble mounds, representing a modern process occurring on a centimetric scale. The data collected so far indicate that this fine-scale feature is an important habitat for different fish species. The modern maintenance of these structures could be due to low sedimentation regime areas shaped by biotic excavation.
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•The marine mesocosm is a reliable tool to study the isolated effects of metal(loid)s on reef organisms.
