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Effect of Light on the Emergence Pattern of Plagiorchis micracanthos Cercariae from Stagnicola exilis

1974; American Society of Parasitologists; Volume: 60; Issue: 5 Linguagem: Inglês

10.2307/3278900

1937-2345

G. E. Wagenbach, Alice L. Alldredge,

Neurobiology and Insect Physiology Research

ARSTRACT: Plagiorchis micracanthos cercariae emerged from naturally infected Stagnicola exilis during darkness of an LD 12:12 photoperiod. Inversion of the photoperiod resulted in immediate reversal of the emergence pattern. Continuous light suppressed emergence while continuous dark permitted emergence to continue rhythmically. Considerable individual variation existed among snails as to the time of maximum emergence. An innate emergence rhythm is hypothesized to exist which is synchronized to photoperiod by the inhibition of light.