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Jens Randel Nyengaard

Retinal oxygen supply shaped the functional evolution of the vertebrate eye

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  • Christian Damsgaard
  • Henrik Lauridsen
  • Anette Marianne Daa Funder
  • ,
  • Jesper Skovhus Thomsen
  • Thomas Desvignes, University of Oregon, United States
  • Dane A. Crossley, II, University of North Texas, United States
  • Peter Rask Møller, University of Copenhagen, Denmark
  • Do Thi Thanh Huong, Can Tho University, Viet Nam
  • Nguyen T. Phuong, Can Tho University, Viet Nam
  • H William Detrich, Northeastern University, United States
  • Annemarie Brüel
  • Horts Wilkens, Univ Hamburg, Dept Biol, Inst Zool, Germany
  • Eric Warrant, Lund University, Sweden
  • Tobias Wang
  • Jens Randel Nyengaard
  • Michael Berenbrink, University of Liverpool, United Kingdom
  • Mark Bayley
The retina has a very high energy demand but lacks an internal blood supply in most vertebrates. Here we explore the hypothesis that oxygen diffusion limited the evolution of retinal morphology by reconstructing the evolution of retinal thickness and the various mechanisms for retinal oxygen supply, including capillarization and acid-induced haemoglobin oxygen unloading. We show that a common ancestor of bony fishes likely had a thin retina without additional retinal oxygen supply mechanisms and that three different types of retinal capillaries were gained and lost independently multiple times during the radiation of vertebrates, and that these were invariably associated with parallel changes in retinal thickness. Since retinal thickness confers multiple advantages to vision, we propose that insufficient retinal oxygen supply constrained the functional evolution of the eye in early vertebrates, and that recurrent origins of additional retinal oxygen supply mechanisms facilitated the phenotypic evolution of improved functional eye morphology.
Original languageEnglish
Article numbere52153
Publication statusPublished - Dec 2019

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