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Updated: May 13, 2026
09:33
An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
Cadmium in marine phytoplankton
1Department of Geosciences, Princeton University, Princeton, NJ 08544, USA. yanxu12@stanford.edu
Metal Ions in Life Sciences
|February 23, 2013
Summary
Cadmium (Cd) distribution in oceans mirrors nutrients, suggesting phytoplankton uptake and deep-sea remineralization. Low Cd concentrations can boost phytoplankton growth, with a key role in diatom carbonic anhydrase.
Area of Science:
- Marine biology
- Biogeochemistry
- Oceanography
Background:
- Cadmium (Cd) distribution in the ocean parallels major nutrients, indicating biological mediation.
- Cd isotope data reveal increased ratios in surface waters, supporting uptake and remineralization cycles.
- While toxic at high levels, Cd can enhance phytoplankton growth under zinc limitation.
Purpose of the Study:
- To investigate the role of cadmium in marine phytoplankton.
- To understand cadmium's uptake mechanisms and biological functions.
- To explore cadmium's influence on biogeochemical cycling in marine environments.
Main Methods:
- Analysis of Cd isotope distribution in seawater.
- Kinetic studies on Cd uptake by phytoplankton.
- Investigation of Cd's role in phytochelatin production and carbonic anhydrase activity.
Main Results:
- Cadmium uptake by phytoplankton is linked to nutrient cycles, with surface uptake and deep-sea remineralization.
- Cadmium can stimulate phytoplankton growth when zinc is limited, via Mn or Zn transport systems.
- Cadmium is essential for diatom carbonic anhydrase (CDCA), with expression regulated by metal availability and seawater chemistry.
Conclusions:
- Cadmium plays a dual role in marine phytoplankton: essential cofactor and potential toxin.
- Understanding cadmium's biological functions is crucial for deciphering its oceanic biogeochemical cycle.
- Cadmium's interaction with zinc and its role in diatom physiology highlight its complex marine ecosystem impact.
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