Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism.

@article{Kaiser2007IncreaseIT,
  title={Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism.},
  author={Alexander Kaiser and Cornelis J Klok and John J. Socha and W K Lee and Michael C. Quinlan and Jon Fewell Harrison},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2007},
  volume={104 32},
  pages={13198-203}
}
Recent studies have suggested that Paleozoic hyperoxia enabled animal gigantism, and the subsequent hypoxia drove a reduction in animal size. This evolutionary hypothesis depends on the argument that gas exchange in many invertebrates and skin-breathing vertebrates becomes compromised at large sizes because of distance effects on diffusion. In contrast to vertebrates, which use respiratory and circulatory systems in series, gas exchange in insects is almost exclusively determined by the… CONTINUE READING
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