caa a22 4500 388112573 CHVBK 20180307125357.0 cr unu---uuuuu 161130e199901 xx s 000 0 eng 10.1017/S0022149X99000086 doi S0022149X99000086 pii (NATIONALLICENCE)cambridge-10.1017/S0022149X99000086 McCarthy A.M. Division of Life Sciences, King's College London, University of London, Campden Hill Road, London, W8 7AH, UK Phototactic responses of the cercaria of Echinoparyphium recurvatum during phases of sub-maximal and maximal infectivity [Elektronische Daten] [A.M. McCarthy] 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. Cambridge University Press Journal of Helminthology Cambridge University Press 73/1(1999-01), 63-65 0022-149X 73:1<63 1999 73 JHL https://doi.org/10.1017/S0022149X99000086 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022149X99000086 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- McCarthy A.M. Division of Life Sciences, King's College London, University of London, Campden Hill Road, London, W8 7AH, UK NATIONALLICENCE 773 0- Journal of Helminthology Cambridge University Press 73/1(1999-01), 63-65 0022-149X 73:1<63 1999 73 JHL CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge