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Science 13 March 1992:
Vol. 255. no. 5050, pp. 1423 - 1425
DOI: 10.1126/science.1542790
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Articles

Science, Vol 255, Issue 5050, 1423-1425
Copyright © 1992 by American Association for the Advancement of Science

articles

Behavioral hypothermia and survival of hypoxic protozoans Paramecium caudatum

GM Malvin and SC Wood

Oxygen Transport Program, Lovelace Medical Foundation, Albuquerque, NM 87108.

Hypoxia has been shown to elicit behavioral hypothermia in a number of different metazoan species, all with nervous systems. The protozoan, Paramecium caudatum, has no nervous system and was not expected to display behavioral hypothermia. However, this species was also found to select a lower temperature in a thermal gradient under hypoxic conditions. This response proved to be beneficial as survival of hypoxic paramecia was greatly increased at lower temperatures. This unicellular species may provide a useful model to investigate the cellular and molecular basis of adaptive thermoregulatory behavior.


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