Evolution of Oxygen Secretion in Fishes and the Emergence of a Complex Physiological System

@article{Berenbrink2005EvolutionOO,
  title={Evolution of Oxygen Secretion in Fishes and the Emergence of a Complex Physiological System},
  author={M. Berenbrink and P. Koldkj{\ae}r and O. Kepp and A. Cossins},
  journal={Science},
  year={2005},
  volume={307},
  pages={1752 - 1757}
}
We have reconstructed the events that led to the evolution of a key physiological innovation underpinning the large adaptive radiation of fishes, namely their unique ability to secrete molecular oxygen (O2). We show that O2 secretion into the swimbladder evolved some 100 million years after another O2-secreting system in the eye. We unravel the likely sequence in which the functional components of both systems evolved. These components include ocular and swimbladder countercurrent exchangers… Expand
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