Copepod community structure after a mining dam disaster in the Southwestern Atlantic Ocean

Conceição, Laura Rodrigues da; Demoner, Lilian Elisa; Pereira, Juliano Bicalho; Perassoli, Fernanda; Ghisolfi, Renato David; Bastos, Alex Cardoso; Dias, Camilo; Lázaro, Georgette Cristina Salvador; Lemos, Kássia do Nascimento; Fernandes, Luiz Fernando Loureiro

doi:10.1016/j.ecss.2021.107325

Cited by 7 publications

(2 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The data in Table 2 indicated that DSi is distributed on the continental shelf by the particulate surface dispersion in the wet season, and it is made available again by the remobilization of the seabed by the waves in the dry season, similarly which has been observed for metal(oid)s in the continental shelf adjacent to the Doce river mouth after the disaster (Longhini et al, 2022). Although the DSi indicate surface dispersion of the river input on the continental shelf, salinity is not significantly affected by freshwater, being always > 30 in shelf waters (Fernandes et al, 2020;Conceicao et al, 2021;Bonecker et al, 2022).The enrichment of DSi in the river channel highlights the influence of the continental nutrient input on the continental shelf. The DSi is crucial for maintaining diatom density and trophic chain balance in aquatic systems (Garnier et al, 2010).…”

Section: Land and Ocean Nutrients Distributionmentioning

confidence: 57%

Macronutrients and dissolved iron in a land-ocean approach: Influences of contamination by ore tailings in Southeastern Brazil

et al. 2022

View full text Add to dashboard Cite

Recently, many dam rupture disasters related to the mining industry have caused significant disruption to ecosystems globally. Contaminants, including nutrients in excess, can be transported from the river watersheds to the ocean in great quantities. In 2015, millions of m3 of iron ore tailings were released in the Doce River in southeastern Brazil, leading to several damaging effects to the river and marine ecosystem. So far, few studies have integrated the impact of these tailings on the river and the sea simultaneously. This research aims to provide a perspective on the macronutrients and iron concentrations and balance in the Doce River and the adjacent continental shelf, the related abiotic factors and the phytoplankton response under a new steady state of iron enrichment environment. The iron ore tailings increased the concentrations of nutrients in the river and on the continental shelf, especially for dissolved silica and iron. There was also a long-term indirect phosphorus enrichment associated to adsorption/desorption onto Fe-oxides and a nitrogen increase possibly due to N-fixing enhanced by iron. N fixation/remineralization predominates in the river watershed, while in the sea, the hydrodynamics provides nutrients supplied by the river and recycling from sediment resuspension. Nutrient ratios show DIP limitation in the river, while the complex marine environment brings both limitations on DIN, DIP, and DSi, as well as a stoichiometric equilibrium to the dataset. The phytoplankton response to the abiotic factors was more representative in the river watershed than on the continental shelf. This work emphasizes the importance of reporting local data for understanding global land-ocean nutrient fluxes and their potential influence on primary productivity and trophic chain balance.

show abstract

Section: Land and Ocean Nutrients Distributionmentioning

confidence: 57%

Macronutrients and dissolved iron in a land-ocean approach: Influences of contamination by ore tailings in Southeastern Brazil

et al. 2022

View full text Add to dashboard Cite

show abstract

“…A particular feature of this tropical drought-prone estuary is the low number of species (n = 20) when compared to other estuaries in Brazil ( [52] (n = 49); [53] (n = 30); [54] (n = 37)) and elsewhere in the world ( [55] (n > 100); [56] (n = 47), [57] (n = 32)). Increased salinity can modify the structure and dynamics of planktonic communities through the selection of predominantly stress-tolerant marine species [58] and consequent simplification of planktonic communities, as observed in hypersaline estuaries, which have low numbers of species with high densities [14,59].…”

Section: Discussionmentioning

confidence: 99%

Copepod Assemblages at the Base of Mangrove Food Webs during a Severe Drought

Campos

Barroso

Belmonte

et al. 2022

Water

View full text Add to dashboard Cite

The effect of severe drought on the functional groups that sustain the base of the mangrove food webs in semi-arid areas is largely unknown. We therefore analyzed the intra-annual variation in the assemblages and functional groups of copepods in a shallow, low-inflow estuary of the Brazilian semi-arid coast when the most severe drought ever occurred. The lowest density was found in April (upstream region) and the highest in August (downstream region). Three main functional groups were identified, sorted by spawning strategy, and further subdivided according to feeding strategy, trophic regime, and diel vertical migration behavior. The community was significantly influenced by the extreme drought period, presenting a temporal homogenization in terms of composition, and an expressive and unexpected increase in density in the dry period, possibly due to phytoplankton blooms resistant to hypersalinity and the occurrence of copepod species adapted to stressful conditions. The few stress-tolerant species sustaining the food webs with seasonal variations were observed simplifying the trophic variability. The results indicate that hypersalinity can induce changes in the zooplankton community, increasing copepod mortality risk and, so, promoting alteration in the trophic estuarine dynamic.

show abstract

Differences in fluctuating asymmetry and liver mass in a population of amphibians affected by the rupture of the Fundão dam, the largest environmental disaster in Brazil

Reis,

Costa,

Nali

2024

Hydrobiologia

View full text Add to dashboard Cite

Copepod community structure after a mining dam disaster in the Southwestern Atlantic Ocean

Cited by 7 publications

References 96 publications

Macronutrients and dissolved iron in a land-ocean approach: Influences of contamination by ore tailings in Southeastern Brazil

Macronutrients and dissolved iron in a land-ocean approach: Influences of contamination by ore tailings in Southeastern Brazil

Copepod Assemblages at the Base of Mangrove Food Webs during a Severe Drought

Differences in fluctuating asymmetry and liver mass in a population of amphibians affected by the rupture of the Fundão dam, the largest environmental disaster in Brazil

Contact Info

Product

Resources

About