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Circadian Rhythmicity and Other Patterns of Spontaneous Motor Activity in Frontinella pyramitela (Linyphiidae) and Argyrodes trigonum (Theridiidae)

Robert B. Suter
The Journal of Arachnology
Vol. 21, No. 1 (1993), pp. 6-22
Stable URL: http://www.jstor.org/stable/3705374
Page Count: 17
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Circadian Rhythmicity and Other Patterns of Spontaneous Motor Activity in Frontinella pyramitela (Linyphiidae) and Argyrodes trigonum (Theridiidae)
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Abstract

Endogenous biological rhythms are apparently found in all eukaryotic organisms. The most ubiquitous of these, the circadian rhythm, functions to synchronize physiology and behavior with diel changes in the environment. Data presented here demonstrate that, in the linyphiid spider Frontinella pyramitela (Walckenaer) and in the theridiid spider Argyrodes trigonum (Hentz), a circadian rhythm modulates locomotor activity in some individuals but not in others. The data also show (a) that higher-frequency endogenous rhythms play a part in determining the patterns of motor activity, and (b) that intervals between bouts of activity are influenced by aperiodic processes that appear to be stochastic.

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