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Reproduction of Dugesia tigrina under short-day and long-day conditions at different temperatures. II. Asexually derived individuals.

SUMMARY Dugesia tigrina was reared under various combinations of long- or short-day length with three temperature levels, 20, 23 and 26 °C. The resulting asexual and sexual reproduction was recorded.Animals reared under short days exhibited shorter generation length and a higher number of worms hatching per cocoon than animals reared under long days. Changes from short to long day or vice versa, experienced by animals during development, resulted in retardation or complete absence of sexual reproduction. Cocoons laid by these individuals showed a high degree of infertility. D. tigrina was also collected in cocoons from the natural habitat shortly before hatching. When exposed to completely different light regimes they responded with a uniform generation length.It is concluded that generation length, apart from temperature influences, is governed by photoperiod during early development of individuals, probably already in the maternal body. The number of worms hatching from one cocoon, likewise, is under photoperiod influence which acts at some time after hatching of the parent.