Tracking Baltic hypoxia and cod migration over millennia with natural tags.

  title={Tracking Baltic hypoxia and cod migration over millennia with natural tags.},
  author={Karin E. Limburg and Carina Olson and Yvonne Walther and Darren L Dale and Caroline P. Slomp and Hans H\oie},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={108 22},
Growing hypoxic and anoxic areas in coastal environments reduce fish habitat, but the interactions and impact on fish in these areas are poorly understood. Using "natural tag" properties of otoliths, we found significant correlations between the extent of Baltic Sea hypoxia and Mn/Ca ratios in regions of cod (Gadus morhua) otoliths corresponding to year 1 of life; this is associated with elevated bottom water dissolved manganese that increases with hypoxia. Elevated Mn/Ca ratios were also found… CONTINUE READING

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