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Lung collapse in the diving sea lion: Hold the nitrogen and save the oxygen

Biology Letters, ISSN: 1744-957X, Vol: 8, Issue: 6, Page: 1047-1049
2012
  • 68
    Citations
  • 0
    Usage
  • 212
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    68
  • Captures
    212
  • Mentions
    1
    • News Mentions
      1
      • News
        1

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Article Description

Lung collapse is considered the primarymechanism that limits nitrogen absorption and decreases the risk of decompression sickness in deep-diving marine mammals. Continuous arterial partial pressure of oxygen (PO) profiles in a free-diving female California sea lion (Zalophus californianus) revealed that (i) depth of lung collapse was near 225 m as evidenced by abrupt changes in PO during descent and ascent, (ii) depth of lung collapse was positively related to maximum dive depth, suggesting that the sea lion increased inhaled air volume in deeper dives and (iii) lung collapse at depth preserved a pulmonary oxygen reservoir that supplemented blood oxygen during ascent so that mean end-of-dive arterial PO was 74±17 mmHg (greater than 85% haemoglobin saturation). Such information is critical to the understanding and the modelling of both nitrogen and oxygen transport in diving marine mammals. © 2012 The Royal Society.

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