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Related Experiment Videos

Ductus arteriosus in pilot whales.

K Johansen1, F Elling, P E Paulev

  • 1Department of Zoophysiology, University of Aarhus, Denmark.

The Japanese Journal of Physiology
|January 1, 1988
PubMed
Summary

The fetal ductus arteriosus (DA) does not remain open in adult pilot whales. Instead, these marine mammals may utilize a functional pulmonary shunt to avoid diving-related risks.

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Area of Science:

  • Marine biology
  • Comparative anatomy
  • Physiology

Background:

  • The ductus arteriosus (DA) is a fetal blood vessel that typically closes after birth in terrestrial mammals.
  • It has been suggested that the DA remains open in adult cetaceans, similar to lungfish.

Purpose of the Study:

  • To investigate the patency of the ductus arteriosus in adult pilot whales.
  • To explore alternative physiological mechanisms for gas exchange regulation in diving mammals.

Main Methods:

  • Examination of hearts from two adult pilot whales.
  • Histological analysis to assess the state of the ductus arteriosus.

Main Results:

  • The ductus arteriosus in the examined pilot whales was found to be almost completely obliterated.
  • Evidence suggests no significant blood flow through the DA in these adult specimens.
  • This indicates the absence of a persistent anatomical shunt.

Conclusions:

  • The ductus arteriosus likely closes in adult pilot whales, contrary to previous claims.
  • Diving mammals may employ a functional pulmonary shunt, facilitated by alveolar collapse, to prevent diving pathologies.

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