title: Evidence of an endogenous circannual rhythm in growth-rates in dinoflagellates.
abstract: Prorocentrum micans and Gonyaulax excavata clonal cultures grown under constant laboratory environmental conditions (continuous light and 20 +/- 1 degree C), over a two-year period, exhibit significative changes in growth rate. When rhythmometrically analyzed by cosinor, a pattern resembling a circannual rhythm became apparent. Significant rhythmometric differences appeared between species. Endogenous rhythms of microorganisms may have ecological implications.
authors.affiliation: Sección de Genética, Hospital Teresa-Herrera, La Coruña, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Costas
authors.forename: M
authors.initials: M
authors.lastname: Varela
mesh_terms: D000818:Animals; D004141:Dinoflagellida / Q000254:growth & development*; D010507:Periodicity; D012621:Seasons; D013045:Species Specificity