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Toxicity of algal cells exposed to the phosphorus and zinc to the cladoceran Ceriodaphnia silvestrii

Grant number: 16/22620-9
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2017
Effective date (End): February 28, 2018
Field of knowledge:Biological Sciences - Ecology
Principal Investigator:Suzelei Rodgher
Grantee:Fernanda Campos de Paulo
Home Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil


Contamination of aquatic systems with trace metals has increased since revolution industrial. Zinc is essential micronutrient for organisms; however Zn at high level can be toxic. Phosphorus is one the most nutrient regulating plankton growth in aquatic ecosystems. It is known that the availability and uptake of metals on phytoplankton are influenced by nutrients, like phosphorus. The dietary is an important exposure route of metals to zooplankton. In the sense, to better understand the impact of toxic metals in water bodies with varying nutrient conditions is necessary to elucidate the interaction between metal and nutrients with respect to their effect on biota. The present study will aim to assess the effects of Raphidocelis subcapitata exposed to the phosphorus and zinc combinations to the zooplankton Ceriodaphnia silvestrii. The green algae R. subcapitata will be exposed to 2.3x10-4 mol L-1 (recommended in L.C. Oligo medium), 2.3×10-6 mol L1 and 6.7×10-7 mol L1 and zinc (1x10-7 mol L-1, 1.22x10-6 and 2.45x10-6 mol L-1 Zn). Metal accumulated by algal cells will be determined. After, algal cells will be provided as food for the cladoceran, in chronic toxicity tests. The life cycle parameters (time of embryonic development, age at first reproduction, number of eggs and live neonates per female and survival of adults). (AU)