Monitoring of ichthyoplanktonic community at the Doce River mouth and adjacent marine region in Southeast Brazil after Fundão dam collapse

• DOI: 10.1016/j.seares.2022.102284
• Publication Date: 2022-09-30T04:24:11Z
• Authors: Ana Cristina Teix...; Márcia Salustiano...; Cristina de Olive...; Fabian Sá; Guilherme Nogueir...; Renato David Ghis...; Sérgio Luiz Costa...
• Keywords: Ichthyoplankton; Carangidae; Sciaenidae

In November 2015, the Fundão dam located in southeast Brazil collapsed, releasing approximately 50 million cubic meters of slurry contaminated with metals into Doce River, reaching marine coastal area. The main objective this study was to analyze effect mud plume after collapse on abundance, composition, and diversity ichthyoplankton during monitoring period one year. We also aimed verify impact River discharge, meteoceanographic events, environmental factors abundance fish eggs larvae. Samplings were conducted at 32 stations 2018, January, April, July 2019. Water temperature, salinity, dissolved oxygen, nutrients assessed from samples obtained water's surface. Ichthyoplankton collected surface along water column using a Neuston Bongo nets, respectively. Most non-viable most sampling periods areas. A total 65 families recorded area, Engraulidae, Clupeidae, Gobiidae, Carangidae, Labridae, Haemulidae, Sciaenidae dominated. Average equitability higher column. influence tailings evidenced by negative correlation larvae abundances some metals, association cobalt. addition, greater flow related lower mean abundances. Further studies are needed monitor continuity effects toxic possible changes it causes ichthyoplanktonic assemblages.