{"refrec":{"BRefID":3483,"RR":"<b>Daro, M.H.</b> (1974). Etude des migrations nycthémérales du zooplankton dans un milieu marin peu profond. <i>Hydrobiologia 44(1-2)</i>: 149-160","BEntID":3483,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Hydrobiologia 44(1-2)</i>: 149-160","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Daro, M.H.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Daro, M.H.","Englishabstract":"The Sluice-dock of Ostend, a shallow (1.5 m) marine biotope of 86 ha stays closed during some 6-7 months of the year and is not influenced by the tides. During 24 h cycles the nycthemeral migrations of the zooplankton at 5 depths in a watercolumn of 1 meter were studied in relation to several environmental factors: water temperature, dissolved oxygen, pH and chlorophyll content. The photosynthesis shows a minimum during the night and shows a maximum during the late afternoon, at which time the water-temperature is also maximal. Holo- and meroplanktonic organisms migrate towards the surface around 3-5 o'clock a.m., at which time the chlorophyll content is minimal, hence our hypothesis of nocturnal grazing, this phenomenon perhaps combined with a nocturnal division of phytoplankton cells. 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