PHYTOPLANKTON BIOMASS INCREASES IN A SILT-IMPACTED AREA IN AN AMAZONIAN FLOOD-PLAIN LAKE OVER 15 YEARS

Authors

  • Vera Lúcia de Moraes Huszar Universidade Federal do Rio de Janeiro, Museu Nacional-UFRJ.
  • Caio Graco-Roza University of Helsinki, Department of Geosciences and Geography, FI-00014, Helsinki
  • João Carlos Nabout Universidade Estadual de Goiás, Campus Central, CEP 75132-903, Anápolis, GO
  • Patrícia Nunes Federal University of Juiz de Fora, Department of Biology, Juiz de Fora, CEP 36036-900, MG
  • Enoque G. Ribeiro Federal University of Rio de Janeiro, Institute of Biodiversity and Sustainability (NUPEM), Integrated Aquatic Ecology Laboratory, CEP 27965-045, Macaé, RJ
  • Sergio Melo Federal University of Western Pará, Institute of Water Science and Technology, CEP 68040-255, Santarém, PA
  • Simone J. Cardoso Federal University of Juiz de Fora, Department of Zoology, Juiz de Fora, CEP 36036-900, MG
  • Uanderson J. Pereira Federal University of Rio de Janeiro, Museu Nacional, Laboratory of Phycology, CEP 20940-040, Rio de Janeiro, RJ
  • Marcos Paulo Figueiredo-de-Barros Federal University of Rio de Janeiro, Institute of Biodiversity and Sustainability (NUPEM), Integrated Aquatic Ecology Laboratory, CEP 27965-045, Macaé, RJ
  • Reinaldo L Bozelli Universidade Federal do Rio de Janeiro, Departamento de Ecologia, Laboratório de Limnologia, CEP 21941-540, Rio de Janeiro, RJ
  • Fabio Roland Federal University of Juiz de Fora, Department of Biology, Juiz de Fora, CEP 36036-900, MG
  • Lucia Helena Sampaio da Silva Federal University of Rio de Janeiro, Museu Nacional, Laboratory of Phycology, CEP 20940-040, Rio de Janeiro, RJ
  • Francisco A Esteves Universidade Federal do Rio de Janeiro, Departamento de Ecologia, Laboratório de Limnologia, CEP 21941-540, Rio de Janeiro, RJ

Keywords:

Clear water lake, inorganic turbidity, restoration, linear mixed-effect regressions

Abstract

Tailings from bauxite mining in Porto Trombetas (Pará state, Central Amazonia, Brazil) was discharged (1979–1989) into Batata Lake affecting about 30% of its area. The lake belongs to a clear-water flood-plain system along the Trombetas River, a tributary of the Amazon River. Siltation is the main perceived factor impacting aquatic and flooded communities. Besides natural regeneration, a program to restore a section of igapó forest in the impacted area (IA) has been conducted since 1991. Decreased light is the main factor reducing total phytoplankton biomass (PhyBM) in IA. We hypothesized that PhyBM in IA increases over time because of the improvement of the underwater light conditions due to the natural regeneration and restoration. We sampled quarterly PhyBM and limnological variables (depth, transparency, temperature, pH, conductivity, dissolved oxygen, turbidity, suspended solids, total Kjeldahl nitrogen, and total phosphorus), over 15 years (2005–2019) at eight sampling sites in the two areas (N = 349). We also obtained daily climatic and hydrologic data. PhyBM was higher in NIA than in IA. The temporal trend in the annual mean of PhyBM increased significantly over time only in the IA, approximating the NIA values, confirming our general hypothesis. The increase of PhyBM in the IA was negatively related to the residual light attenuation caused by non-phytoplankton turbidity and to total phosphorus, and positively to air temperature and site depth (p < 0.05; Marginal r2 = 0.18; Conditional r2 = 0.29). Instead, in NIA, PhyBM was explained only by the increase in air temperature (p < 0.05; Marginal r2 = 0.15; Conditional r2 = 0.34). We concluded that the PhyBM in the IA positively responds to the synergy between increasing light availability, air temperature, and site depth, and decreasing total phosphorus concentrations, regardless of hydrologic phase.

Author Biography

Vera Lúcia de Moraes Huszar, Universidade Federal do Rio de Janeiro, Museu Nacional-UFRJ.

Tem doutorado em Ecologia e Recursos Naturais pela Universidade Federal de São Carlos (1994). Atualmente é Prof. Titular da Universidade Federal do Rio de Janeiro e Pesquisador 1C do CNPq. Realizou Pós-doutorado no Institute of Ecosystem Studies, NY, USA (1996-1997 e 2004). Coordena e mantém projetos em colaboração com instituições na Holanda, Uruguay, Argentina e Estados Unidos, incluindo o Programa Ciências Sem Fronteiras. É revisora de periódicos internacionais e nacionais e participa de comitês de agências de fomento. Tem experiência na área de Ecologia, com ênfase em ecologia aquática, atuando principalmente em ecologia do fitoplâncton, macroecologia, diversidade, balanço de carbono, abrangendo lagoas costeiras, lagos de inundação, estuários, reservatórios, sistemas de criação de peixes e rios. Atua no Programa de Pós-graduação em Ciências Biológicas (Botânica), tendo orientado ou co-orientado 10 estudantes de doutorado e 16 de mestrado, 12 dos quais são docentes em universidade públicas ou atuam em empresas públicas. Publicou 114 artigos em periódicos nacionais e internacionais (Fator H ISI=31; Scopus=34), 03 trabalhos completos em anais de congresso, 13 capítulos de livro e participou na organização de um livro

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Published

2022-07-08