title: A circadian rhythm in Daphnia magna.
authors.affiliation: Laboratory of Animal Physiology, University of Amsterdam, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Ringelberg
authors.affiliation: Laboratory of Animal Physiology, University of Amsterdam, The Netherlands.
authors.forename: Hanneke
authors.initials: H
authors.lastname: Servaas