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Evidence of circadian rhythms in a cave crayfish

✍ Scribed by Jegla, Thomas C. ;Poulson, Thomas L.

Publisher
John Wiley and Sons
Year
1968
Tongue
English
Weight
721 KB
Volume
168
Category
Article
ISSN
0022-104X

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✦ Synopsis

Evidence of a circadiam clock mechanism was found in the cave crayfish, Orconectes pellucidus, even though it is blind and has been isolated from daiIy cycles for at least 25,000 generations. Five of seven crayfish tested under cave conditions of continuous darkness and 13°C showed apparent rhythms of activity and/or oxygen consumption. These rhythms were statistically significant, as judged by autocorrelation, for three individuals with average periods of 26, 27, and 34 hours. All three crayihh exposed to 1ight:dark cycles with a 24 hour period showed more regular rhythmicity than in continuous darkness but only one showed clear evidence of entrainment, i.e., synchrony of activity or oxygen consumption with the light: dark cycle. Another crayfish tested apparently conformed to Aschops circadian rule.

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