Photoperiod and temperature interaction in the determination of reproduction of the edible snail, Helix pomatia

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Abstract
Snails were kept in self-cleaning housing chambers in an artificially controlled environment. Mating was frequent under long days (18 h light) and rare under short days (8 h light) regardless of whether the snails were kept at 15.degree.C or 20.degree.C. An interaction between photoperiod and temperature was observed for egg laying. The number of eggs laid (45-50/snail) and the frequency of egg laying (90-130%) were greater in long than in short days (16-35/snail and 27-77%) but a temperature of 20.degree.C redressed, to some extent, the inhibitory effect of shorter days. At both temperature only long photoperiods brought about cyclic reproduction over a period of 16 weeks, confirming the synchronizing role of photoperid on the neuroendocrine control of egg laying in this species of snail.

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