2018-08-102018-08-101978Биология моряhttps://repository.marine-research.ru/handle/299011/2288The results are presented concerning determinations of chlorophyll «a» content in plankton of the Black, Ionian, Sardinian seas and in the Atlantic in a 100 m layer and at standard depths. The material was collected in April—August, 1976 during the 30th cruise of the research ship «Mikhail Lomonosov». Determinations were carried out by spectro-photometric method in membrane filters. The average indices of chlorophyll for the 0-100 m layer varied from 0.07 to 0.08 mg/m³ in the Sardinian sea, from 0.006 to 0.09 in a zone of convergences in the southern Atlantic, from 0.24 to 0.35 mg/m³ in the productive upwelling zones.ru