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Antarctic ecosystems show ultratrace levels of most metals, but human activities significantly increase lead (Pb) pollution. Antarctic biota accumulate metals like cadmium (Cd) and mercury (Hg) comparable to Northern Hemisphere levels.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Ecotoxicology

Background:

  • Trace element concentrations in Antarctic ecosystems are crucial for pollution detection.
  • Antarctic ice cores reveal historical atmospheric levels of trace elements, showing pre-human variations and post-human contamination.
  • Human activities are a significant source of lead (Pb) pollution in Antarctica, while other metals like cadmium (Cd) and mercury (Hg) have localized impacts.

Purpose of the Study:

  • To establish a background database for trace element concentrations in Antarctic ecosystems.
  • To assess past and present-day changes in global atmospheric trace element levels using Antarctic ice and snow cores.
  • To investigate the sources, distribution, and biomonitoring potential of trace elements in Antarctica.

Main Methods:

  • Analysis of trace element concentrations (Pb, Cd, Hg, Zn) in abiotic components (ice, snow, soil, air, sediment) and biotic components (fish, mollusks, lichens, mosses).
  • Utilizing Antarctic ancient ice and snow cores to reconstruct historical atmospheric trace element levels.
  • Field and experimental data collection on human activities and their localized environmental impact.

Main Results:

  • Most trace element concentrations in Antarctic abiotic matrices are at ultratrace levels, with Pb and Hg being exceptionally low in snow, soil, air, and sediment.
  • Lead (Pb) concentrations in Antarctica are largely anthropogenic, decreasing recently due to reduced leaded gasoline use, but local human activity still increases atmospheric Pb.
  • Trace element concentrations in Antarctic biota, particularly Cd and Hg, are comparable to those in polar and temperate regions of the Northern Hemisphere.

Conclusions:

  • Antarctic ecosystems are sensitive indicators of global and local pollution.
  • Environmental and biological factors in Antarctica influence metal accumulation in biota, with extreme conditions affecting detoxification mechanisms.
  • Antarctic organisms like fish, mollusks, lichens, and mosses show potential as biomonitors for assessing metal pollution and establishing baselines.