Adv. mrir. l t h l . , \' CIRCADIAN PERlODlClTlES IN NATURAL
POPULATIONS OF MARINE PHYTOPLANKTON
ALAIN SOURNIA
Lwboratoire dex Pk:hes Outre-mer,
Muskurn national d'Histoire naturelle,
Paris, France
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IntmdricLion
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Tho <:nnerabion Tim0 of Pliytciplaukton Culls . . .. ..
H. A n Onler of Magnitude . . .. ,. .. ..
C ~ l l
Division and lyynchroiiy . . .. .. .. ..
A. Culture Experiments
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R. Natiral Population8
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C. Open Questions . . .. .. . .
Buoyancy and Sinking
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Vorticd Migration. . .. .. .. ..
A. Obwrvatious
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B. Phototactic lmplic&tkma . . .. .. . . . .
C. Other Implic&tions
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Chlorophyll A Content . .
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Other Cellular Charaoterist,ics . . .. .. .. ..
The Rhythm of Photosynthetic Capacity
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A. 1)ofinition and Charact,erist,iccl . . .. .. ..
U. Mochanisms
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C. lrnplications for Primary l'rotluction hInasuremontx . .
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A. The Data . . .. .. . . ..
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I.'h~t,o~yiithe~ia under Natttral ('oriclit.ionn
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Ret5piration
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Nutrient Uphke . . . . . . . . .. .. ..
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Xxoretion
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A. Nitrogon . . . . . . . . . .
B. Phosphorus
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C. Silica
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I3iolumineacnnc~ . . . . .. . . . . .. . .
Miclcolluneous ?' ropert.iea
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Environmental Fantors . .
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A. Light
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B. Temperature
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D. Macro- and Micronutrients
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E. Phytoplankton/Zooplanktnn Interrelationship
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F. Intarferences with Non-circadian F'eriods
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G. Exogunoiis versus Enciognrious Factom. .
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Komo Romarks and Conclmions. . . . .. . . . .
B. Synchrony in Natural Populations
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C. Oxygen, CO,,.pH . . .. .. .. .. . .
A. Phytoplanktology, Algal Physiology and C'hronoliology
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3/50
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168
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3r)J
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