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Biol Bull 138: 77-87. (February 1970)
© 1970 Marine Biological Laboratory
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THE ROLE OF ILLUMINATION AND TEMPERATURE IN THE CONTROL OF SEXUAL REPRODUCTION IN THE PLANARIAN DUGESIA TIGRINA (GIRARD)

C. VOWINCKEL 1

1 Department of Zoology, McGill University, Montreal, Canada

1. Planarians were collected from the natural habitat in late summer and exposed to gradual reductions in illumination and/or temperature.

2. They responded to variations of either or both factors with sexual development while the control group under constant temperature and light conditions did not enter sexual development.

3. Asexual reproduction (fission) was inhibited by low temperatures and apparently not influenced by changes in illumination.

4. Incubator reared, cloned descendents of an individual which had previously laid viable cocoons did not respond to the same treatment.

5. The results are discussed and the importance of the difference between the two populations' response is interpreted.






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Copyright © 1970 by the Marine Biological Laboratory.