Evidence of an endogenous circannual rhythm in growth-rates in dinoflagellates.
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.
Costas
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Sección de Genética, Hospital Teresa-Herrera, La Coruña, Spain.
Varela
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M
D000818:Animals; D004141:Dinoflagellida / Q000254:growth & development*; D010507:Periodicity; D012621:Seasons; D013045:Species Specificity