Dynamics of mercury in the plankton of a hydroelectric reservoir, Western Amazon
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Dynamics of mercury in the plankton of a hydroelectric reservoir, Western Amazon Elisabete Lourdes do Nascimento & Roberto Keidy Miyai & João Paulo de Oliveira Gomes & Ronado de Almeida & Dario Pires de Carvalho & Ângelo Gilberto Manzatto & José Vicente Elias Bernardi & Ene Glória da Silveira & Wanderley Rodrigues Bastos
Received: 10 March 2020 / Accepted: 10 September 2020 # Springer Nature Switzerland AG 2020
Abstract The energy transfer in the aquatic food chain is an important way for mercury (Hg) to enter other trophic levels. The objective of this work was to evaluate the Hg concentrations in plankton upstream and downstream of the Samuel Hydroelectric Reservoir, Rondônia, Brazil. Phytoplankton and zooplankton samples were collected with 20-μm and 68-μm nylon nets. An aliquot was removed for taxonomic analysis and another for total mercury determination, performed by cold vapor atomic absorption spectroscopy. Water physical-chemical parameters were also measured. The Hg concentrations in total plankton (phytoplankton and zooplankton samples) obtained at the three sampling upstream stations showed the same behavior, with the highest values registered in June 2005 (232 μg kg−1,
118 μg kg−1, 128 μg kg−1). The lowest values at stations J1 and M1 were recorded in November 2005 (4 μg kg−1 and 22 μg kg−1, respectively), while the lowest values at stations M4 and M8 were recorded in October 2005 (22 μg kg−1 and 5 μg kg−1, respectively). The Hg results found in the plankton in this study corroborate the results of other recent studies in the same region. The statistical analyses revealed that Hg concentrations in plankton do not explain the distribution of these organisms at the four sampling stations of Samuel Reservoir.
Keywords Hg . Environmental variables . Phytoplankton . Zooplankton . Jamari River
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10661-020-08600-y) contains supplementary material, which is available to authorized users. E. L. do Nascimento (*) : W. R. Bastos Grupo de Pesquisa em Águas Superficiais e Subterrâneas-GPEASS. Laboratório de Limnologia e Microbiologia-LABLIM. Departamento Acadêmico de Engenharia Ambiental-DAEA, Fundação Universidade Federal de Rondônia-UNIR, Rua Rio Amazonas, 351, Jardins dos Migrantes, Ji-Paraná CEP: 76900-726, Brazil e-mail: [email protected] R. K. Miyai Centrais Elétricas do Norte do Brasil S/A, Rua Major Amarante, 513, Arigolândia, Porto Velho CEP: 76801-180, Brazil J. de Oliveira Gomes Instituto Chico Mendes de Conservação da Biodiversidade-ICMBio, Rua São Cristovão, 903 - Bairro Jardim Presidencial, Ji-Paraná CEP:76901-038, Brasil
R. de Almeida Departamento de Ciências Sociais e Ambientais, Fundação Universidade Federal de Rondônia-UNIR, Rodovia 425 - km 2,5 Jardim das Esmeraldas, Guajara-Mirim CEP: 76850-000, Brazil D. P. de Carvalho : Â. G. Manzatto : E. G. da Silveira : W. R. Bastos Laboratório de Biogeoquímica Ambiental Wolfgang C. Pfeiffer. Departamento de Ciências Biológicas, Fundação Universidade
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