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Science 14 September 1973:
Vol. 181. no. 4104, pp. 1063 - 1064
DOI: 10.1126/science.181.4104.1063
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Articles

Thermophilic Ostracod: Aquatic Metazoan with the Highest Known Temperature Tolerance

Conrad E. Wickstrom 1 and Richard W. Castenholz 1

1 Department of Biology, University of Oregon, Eugene 97403

The upper lethal temperature for an ostracod of the genus Potamocypris collected from a thermal stream ranged from 49°C for incubation of more than 5 hours to 55.75°C for 1-minute incubations. Field collections were held at 35°C for less than 24 hours before experimental incubations. Calculated temperatues for 50 percent mortality for 60, 40, 20, 10, 5, and 1 minute of exposure were 50.44°, 50.96°, 51.43°, 52.03°, 52.77°, and 55.12°C, respectively.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)