Oxygen hypothesis of polar gigantism not supported by performance of Antarctic pycnogonids in hypoxia.

  title={Oxygen hypothesis of polar gigantism not supported by performance of Antarctic pycnogonids in hypoxia.},
  author={H Arthur Woods and Amy L. Moran and Claudia P Arango and Lindy B Mullen and Chris Shields},
  journal={Proceedings. Biological sciences},
  volume={276 1659},
Compared to temperate and tropical relatives, some high-latitude marine species are large-bodied, a phenomenon known as polar gigantism. A leading hypothesis on the physiological basis of gigantism posits that, in polar water, high oxygen availability coupled to low metabolic rates relieves constraints on oxygen transport and allows the evolution of large body size. Here, we test the oxygen hypothesis using Antarctic pycnogonids, which have been evolving in very cold conditions (-1.8-0 degrees… CONTINUE READING
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