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Regulation of Asexual Reproduction of the Planarians Dugesia tigrina

✍ Scribed by I. M. Sheiman; N. Yu. Sakharova; Kh. P. Tiras; M. F. Shkutin; V. V. Isaeva


Book ID
110416522
Publisher
Springer
Year
2003
Tongue
English
Weight
46 KB
Volume
34
Category
Article
ISSN
1062-3604

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Induction of sexuality in the asexual fo
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Dugesia tigrina ( syn. Euplanaria tigrina, Planaria maculata) reproduces in nature in two different ways ; sexually, by egg capsules, and asexually, by fission. This fact was first observed by Curtis ( '02, p. 556) who studied the life cycle of D. tigrina in the vicinity of Falmouth, Massachusetts.

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Asexual planarians of the species Dugesia dorotocephala exhibit a distinct day-night rhythm of fissioning under the influence of normal photoperiod; fissioning occurs only at night. This rhythm is broken by continuous illumination, continuous darkness, or by decapitation. The fissioning rate increas