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Title: Schistosoma mansoni: cercarial responses to irradiance changes

Cercariae of Schistosoma mansoni alternate between active swimming and passive drifting. They began swimming in response to either an increase or decrease in irradiance experienced during the passive phase. The number of cercariae reacting to a shadow was proportional to the magnitude of the stimulus. The shadow response may be mediated by the cercaria's ciliary receptors. About half as many cercariae reacted to an irradiance increase as to an equivalent decrease. This report is the first quantitative study of photosensory stimulus-response relationships in schistosome cercariae.
Authors:
Publication Date:
OSTI Identifier:
6816342
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Parasitol.; (United States); Journal Volume: 68:1
Research Org:
Department of Biological Science, The Florida State University, Tallahassee
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; SCHISTOSOMA; PHOTOSENSITIVITY; BEHAVIOR; LIFE CYCLE; STIMULI; VISIBLE RADIATION; ELECTROMAGNETIC RADIATION; HELMINTHS; PLATYHELMINTHS; RADIATIONS; SENSITIVITY; TREMATODES 550700* -- Microbiology; 550100 -- Behavioral Biology