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Circadian Migratory Behavior of a Cestode Symbiote in the Rat Host

C. P. Read and Araxie Z. Kilejian
The Journal of Parasitology
Vol. 55, No. 3 (Jun., 1969), pp. 574-578
DOI: 10.2307/3277301
Stable URL: http://www.jstor.org/stable/3277301
Page Count: 5
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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 Migratory Behavior of a Cestode Symbiote in the Rat Host
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Abstract

Under specified experimental conditions, Hymenolepis diminuta exhibits a longitudinal circadian migration in the small intestine of the rat. This was shown by changes in distribution of total worm tissue and of scolices in the gut at different times of the day in hosts on a 15-hr feeding schedule. Maximum numbers of scolices and amounts of worm tissue were in the anterior 10 inches of the small intestine during the 12 to 4 AM period, and lowest quantities at 4 to 5 PM. There were accompanying inverse worm distribution changes in the posterior part of the small intestine. Short periods of host starvation delayed anteriad migration. In a limited number of combinations, migration occurred in infections of one to 30 worms, 10 to 21 days of age. The timing of migration was changed by altering the feeding pattern of the host. Fluoroscopic study of the rat gut during and after killing indicated that the migration was not an artifact produced by violent gut movements.

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