Copper-Phytoplankton reciprocal interaction: Biogeochemical cycling of copper and its isotopes ...
Copper (Cu) is involved in multiple metabolic processes in phytoplankton. However, dissolved Cu (dCu) concentrations that exceed a tolerance level can be toxic. Owing to its biological relevance to marine phytoplankton, there is a need to better understand the distribution of Cu in the ocean. The ov...
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| Format: | Thesis |
| Language: | English |
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The Australian National University
2023
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| Online Access: | https://dx.doi.org/10.25911/pwjt-dw04 https://openresearch-repository.anu.edu.au/handle/1885/303387 |
| Summary: | Copper (Cu) is involved in multiple metabolic processes in phytoplankton. However, dissolved Cu (dCu) concentrations that exceed a tolerance level can be toxic. Owing to its biological relevance to marine phytoplankton, there is a need to better understand the distribution of Cu in the ocean. The overarching aim of this study was to investigate the feedback interaction Cu has with marine phytoplankton and to understand better the biogeochemical cycling of Cu and its isotopes in the marine realm. Firstly, two Southern Ocean (SO) diatoms, Proboscia inermis and Chaetoceros flexuosus were cultured under various concentrations of Cu and iron (Fe) in order to investigate the effects of Cu-Fe interaction on growth rate, silicon (Si) uptake kinetics and Si isotope fractionation. Overall, divergent responses were observed in Michaelis-Menten kinetic uptake parameters and Si isotope fractionation. Our findings confirmed that Cu has a significant effect on biochemical processes in diatoms and can potentially alter ... |
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