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Phototactic responses of the cercaria of Echinoparyphium recurvatum during phases of sub-maximal and maximal infectivity

Published online by Cambridge University Press:  11 April 2024

A.M. McCarthy
A.M. McCarthy*
Affiliation:
Division of Life Sciences, King's College London, University of London, Campden Hill Road, London, W8 7AH, UK
*
*Correspondence to the author at the above address c/o Professor P.J. Whitfield.
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Abstract

Phototactic responses of cercariae of the echinostome Echinoparyphium recurvatum (Digenea: Echinostomatidae) were investigated during phases of sub-maximal and maximal infectivity using a simple light/dark choice chamber. The phototactic responses of a total of 400 cercariae were examined in 20 replicate experiments during their sub-maxinal infectivity dispersal phase (0.5 h post-emergence from the first intermediate host Lymnaea peregra) and during their maximal infectivity phase (2.5 h post-emergence). Cercariae in the sub-maximal infectivity dispersal phase were found to be positively phototactic, significantly larger numbers of them occurring on the light side of a light/dark choice chamber P < 0.001. Cercariae in the maximal infectivity phase were found to be negatively phototactic, significantly larger numbers of them being found on the dark side of the choice chamber, P < 0.001. This report of ‘phototactic switching’ demonstrated by the cercariae of E. recurvatum from a positively phototactic dispersal phase to a negatively phototactic infection phase constitutes the first record of such behaviour in the cercaria of an echinostome.

Type
Research Article
Information
Journal of Helminthology , Volume 73 , Issue 1 , January 1999 , pp. 63 - 65
Copyright
Copyright © Cambridge University Press 1999

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References

Boret, J. (1967) Contribution à la morphologie et la biologie de Diplozoon paradoxum von Nordman, 1832.Bulletin de la Société Neuchateloise des Sciences Naturelles 90, 63–159.Google Scholar
Cable, R.M. (1972) Behaviour of digenetic trematodes. pp. 1–8 in Canning, E.U. & Wright, C.A. (Eds) Behavioural aspects of parasite transmission . London, Academic Press.Google Scholar
Cort, W.W. (1922) A study of the escape of cercariae from their snail hosts.Journal of Parasitology 8, 275–281.CrossRefGoogle Scholar
Evans, N.A. (1985) The influence of environmental temperature upon transmission of cercariae of Echinostoma liei (Digenea: Echinostomatidae). Parasitology 90, 269–275.CrossRefGoogle Scholar
Evans, N.A. & Gordon, D.M. (1983) Experimental studies on the transmission dynamics of the cercariae of Echinoparyphium recurvatum (Digenea: Echinostomatidae). Parasitology 87, 167–174.CrossRefGoogle Scholar
Fournier, A. (1984) Photoreceptors and photosensitivity in platyhelminthes. pp. 217–239 in Ali, M.A. (Ed.) Photoreceptors and vision in invertebrates. NATO ASI Series A, Vol. 4.CrossRefGoogle Scholar
Haas, W., Körner, M., Hutterer, E., Wegner, M. & Haberl, B. (1995) Finding and recognition of the snail intermediate hosts by three species of echinostome cercariae. Parasitology 110, 133–142.CrossRefGoogle Scholar
HMSO (1969) Fish toxicity tests. Her Majesty's Stationery Office Leaflet Number Dd. 139779 K36 12/69.Google Scholar
Lowenberger, C.A. & Rau, M.E. (1994) Plagiorchis elegans: emergence, longevity and infectivity of cercariae and host behavioural modifications during cercarial emergence. Parasitology 109, 65–72.CrossRefGoogle ScholarPubMed
McCarthy, A.M. (1989) The biology and transmission dynamics of Echinoparyphium recurvatum (Digenea: Echinostomatidae). 329 pp. PhD thesis, King's College London, University of London.Google Scholar
Paling, J.E. (1969) The manner of infection of trout gills by the monogenean parasite Discocotyle sagittata.Journal of Zoology 151, 293–309.CrossRefGoogle Scholar