caa a22 4500 386399921 CHVBK 20180307112154.0 cr unu---uuuuu 161130e198910 xx s 000 0 eng 10.1017/S0031182000058662 doi S0031182000058662 pii (NATIONALLICENCE)cambridge-10.1017/S0031182000058662 Cercarial emergence of Proterometra macrostoma and P. edneyi (Digenea: Azygiidae): contrasting responses to light: dark cycling [Elektronische Daten] Proterometra macrostoma and P. edneyi infect the same snail host, Goniobasis semicarinata, but different fish hosts in their life-cycles. Cercariae of P. macrostoma complete development in sunfish, those of P. edneyi in darters; fish become infected when they ingest free-swimming cercariae as ‘prey'. Laboratory and field experiments were designed to test the hypothesis that light: dark (L: D) cycling regulates emergence of both species. Under L: D cycling conditions, P. macrostoma emerged in the dark and P. edneyi in the light. These emergence patterns resulted from differential sensitivity to light and dark. In the laboratory and field, reversing the light and dark periods resulted in corresponding alterations in emergence patterns of both species. Both species emerged in constant light and constant dark, but their emergence patterns were altered. Emergence patterns may represent adaptations that make the cercariae more susceptible to ‘predation' by their respective fish hosts. Copyright © Cambridge University Press 1989 Proterometra macrostoma nationallicence Proterometra edneyi nationallicence cercarial emergence nationallicence light: dark cycling nationallicence emergence patterns nationallicence Lewis M. C. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 Welsford I. G. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 Uglem G. L. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 Parasitology Cambridge University Press 99/2(1989-10), 215-223 0031-1820 99:2<215 1989 99 PAR https://doi.org/10.1017/S0031182000058662 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0031182000058662 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lewis M. C. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 NATIONALLICENCE 700 1- Welsford I. G. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 NATIONALLICENCE 700 1- Uglem G. L. Physiology Group, School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506 NATIONALLICENCE 773 0- Parasitology Cambridge University Press 99/2(1989-10), 215-223 0031-1820 99:2<215 1989 99 PAR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge