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Biol Bull 78: 403-406. (June 1940)
© 1940 Marine Biological Laboratory
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THE MODIFIABILITY OF THE DIURNAL PIGMENTARY RHYTHM IN ISOPODS

NATHANIEL KLEITMAN 1

1 From the Bermuda Biological Station, St. Georges, Bermuda

Although groups of Bermudan isopods, Ligia baudiniana, preserve their natural diurnal pigmentary rhythm when kept in total darkness for several days, they rapidly acquire an artificial 18-hour pigmentary rhythm, if exposed to alternating periods of 10 hours of light and 8 of darkness. The new rhythm is paradoxical, pigment cell dispersion occurring during darkness, instead of during the hours of illumination.






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