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Résultats de la mission Hydratlante I du N. O. Jean Charcot (au large des côtes atlantiques françaises). 2. Pigments phytoplanctoniques
Author(s) -
Travers Marc
Publication year - 1979
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19790640104
Subject(s) - seston , phytoplankton , chlorophyll a , chlorophyll , pigment , population , nutrient , oceanography , botany , environmental science , chemistry , environmental chemistry , biology , ecology , geology , demography , organic chemistry , sociology
Results of Hydratlante I Cruise of R. V. Jean Charcot (off the Atlantic French Coast). 2. Phytoplankton Pignients Measurements of phytoplankton pigments have been made at all levels and stations prospected during Hydratlante I. In neritic as well as oceanic waters, the chlorophyll a content of seston was low: only 0.07–0.08 mg · m −3 at 5 and 20 m; maximum average value at 50 m: 0.14 mg · m −3 . The chlorophyll a content of phytoplankton cells averages 6.2 pg but varies greatly with population density. The plant carotenoids, relatively more abundant than chlorophyll, average 0.7 mg · m −3 at 5 m; 0.9 at 20 m and 1.2 at 50 m. Pigment distributions seem to be largely dependent on thermal structure and nutrient concentration. They are also more or less strongly correlated with water transparency, rate of 14 C fixation and organic seston content. Comparisons with previous results in the same area reveal a rather good agreement.