Radiolarians decreased silicification as an evolutionary response to reduced Cenozoic ocean silica availability.

  title={Radiolarians decreased silicification as an evolutionary response to reduced Cenozoic ocean silica availability.},
  author={David B. Lazarus and Benjamin Kotrc and Gerwin Wulf and Daniela N Schmidt},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={106 23},
It has been hypothesized that increased water column stratification has been an abiotic "universal driver" affecting average cell size in Cenozoic marine plankton. Gradually decreasing Cenozoic radiolarian shell weight, by contrast, suggests that competition for dissolved silica, a shared nutrient, resulted in biologic coevolution between radiolaria and marine diatoms, which expanded dramatically in the Cenozoic. We present data on the 2 components of shell weight change--size and… CONTINUE READING
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