Evidence for phytoplankton succession and chromatic adaptation in the Sargasso Sea during spring 1985

摘要: Measurements of photosynthetic p~gmen t s , nutnents, spectral Irradiance and vanous physical parameters were performed in the western Sargasso Sea (35"N, 70°W) to ~ n v e g a factors affecting phytoplankton blomass dlstribut~ons Algal plgment concentrations compos~ t~ons measured during spring 1985 showed cons~derable time-dependent vana which cons~stent with those documented by dlrect mlcroscoplc observation D u r early Apnl, 2-fold Increases In chlorophyll fucoxanthln on relatively short tlme scale days The presence d~atom-dominated community malnly specles genera Rhlzosolen~a Chaetoceros, suggested that we witnessing stage bloom Upon return thls location 2 wk later, diatom was replaced considerably more diverse assemblage consisting prymnes~ophytes, cyanobacter~a, d~noflagellates, green algae (~ncludlng praslnophytes) d~a toms vert~cal structures d~splayed d i l ccessory plgments dunng Apnl markedly simllar suggest major taxa not un~formly distributed upper 200 m b as broadly overlapp~ng layers, 1~1th cyanobacterla diatoms most abundant x layer, prymnesiophytes at ln termed~ate depths, (Including prasinophytes) deeper water column Results p rov~de descnptive evidence for rapid succession chromatically-adapted springtime