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Learning to Air-Breathe: The First Steps.

Mark Bayley1, Christian Damsgaard2, Mikkel Thomsen1

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Air-breathing evolved multiple times in bony fish, impacting ventilation and acid-base balance. Only obligate air-breathers fully benefit from combined control, guiding future research on respiratory and metabolic regulation.

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Area of Science:

  • Comparative physiology
  • Evolutionary biology
  • Aquatic respiration

Background:

  • Air-breathing has evolved independently multiple times in bony fish.
  • This adaptation significantly influences physiological regulation, particularly ventilation and acid-base status.
  • Understanding the evolutionary pressures and constraints is key to comprehending air-breathing adaptations.

Purpose of the Study:

  • To review the physico-chemical constraints of air and water on respiration.
  • To analyze extant air-breathing fish within this physiological framework.
  • To identify the specific conditions under which combined control of ventilation and acid-base status offers advantages.

Main Methods:

  • Comparative analysis of air-breathing fish.
  • Review of physico-chemical principles governing gas exchange in water and air.
  • Physiological framework analysis of extant species.

Main Results:

  • Air-breathing fish face distinct physico-chemical challenges in water versus air.
  • The benefits of integrated ventilation and acid-base control are maximized in obligate air-breathers.
  • Partial air-breathers show varied levels of benefit depending on their specific adaptations.

Conclusions:

  • The evolution of air-breathing in fish is constrained by environmental factors.
  • Obligate air-breathing facilitates superior physiological regulation.
  • Further research should focus on the physiological mechanisms and evolutionary pathways of obligate air-breathing fish.