title: Photoorientation, motility and pigmentation in a freshwater peridinium affected by ultraviolet radiation.
abstract: The effects of ultraviolet radiation on orientation, motility and pigmentation were measured in the freshwater dinoflagellate, Peridinium gatunense. Histograms of the positive phototactically oriented cells showed a decrease in the degree of orientation even after short exposure times. Quantification of the orientation revealed a significant inhibition after 2 h exposure. Similarly, the percentages of motile cells and the mean linear velocity of the cells was strongly affected. UV radiation also caused a massive bleaching of the cellular pigments as shown by absorption spectra determined after increasing exposure times. The ecological consequences of these effects are discussed.
authors: Institut für Botanik and Pharmazeutische Biologie, Friedrich-Alexander-Universität, Erlange, Federal Republic of Germany.
authors: D P
authors: DP
authors: Häder
authors: S M
authors: SM
authors: Liu
authors: M
authors: M
authors: Häder
authors: W
authors: W
authors: Ullrich
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000528:radiation effects; D004141:Dinoflagellida / Q000502:physiology / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D008027:Light; D010860:Pigments, Biological / Q000378:metabolism / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D010860:Pigments, Biological