PMID: 6021681Apr 28, 1967Paper

Natural free-running period in vertebrate animal populations

Science
C H LOWEK E Justice

Abstract

Regression analysis (analysis of covariance) is contrasted with the conventional "mean period length" for estimating the length of period of the spontaneous activity frequency (free-running period) in population samples of Gila monsters (Heloderma suspectum) and kangaroo rats (Dipodomys merriami) in the Sonoran Desert. The mean period length in each population does not differ significantly from 24:00 hours (P > .05) and it does not differ significantly (P > .05) between the species studied; the probability that the free-running period a(in constant dark) in natural populations of Gila monsters and kangaroo rats is different from 24:00.0 is less than 1 in 1000 (P < .001). The so-called "mean period length" is of little or no use for precise determination of the period and phase relationships in circadian rhythms; moreover, it is entirely without value for statistical testing of differences either within or between populations.

References

Jan 1, 1960·Cold Spring Harbor Symposia on Quantitative Biology·J ASCHOFF
Jan 1, 1960·Cold Spring Harbor Symposia on Quantitative Biology·P J DECOURSEY
Jan 1, 1960·Cold Spring Harbor Symposia on Quantitative Biology·K S RAWSON
Jan 1, 1960·Science·P J DE COURSEY
Jun 1, 1952·Pflügers Archiv : European journal of physiology·J ASCHOFF
May 3, 1957·Science·L C Cole

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