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Molecule dependent chemotactic responses of Tetrahymena pyriformis elicited by volatile oils

100%

Kohidai L. , Lemberkovics E. , Csaba G.

Acta Protozoologica

1995

tom 34

nr 3

Effects of light and temperature on the emergence of Haplorchis pumilio cercariae from the snail host, Thiara tuberculata

59%

Umadevi K. , Madhavi R.

Acta Parasitologica

1997

tom 42

nr 1

The cercaria of Haplorchis pumilio exhibited diurnal pattern in the emergence from the snail host, with peak between 10 am and 12 noon and limited emergence during night. Continuous light permitted emergence to continue rhythmically while continuous dark has suppressed the emergence. Inversion of photoperiod has resulted in immediate reversal of the emergence pattern. Variation is found in the numbers of cercariae released by different individuals of snails and by the single snail on different days, but consistency is maintained in the emergence pattern. Temperature of 30-35°C is found to be favourable for the cercarial emergence. The results of the study demonstrate that emergence pattern is influenced by both exogenous and endogenous factors.