Some observations on marine phytoplankton kinetics: 2. the effect of nitrate and ammonium concentrations on the growth and uptake rates of the natural population of Ubatuba region, SP (23ºS, 045ºW)

• Main Author: Gilda Schmidt
• Format: Article
• Language: English
• Published: Universidade de São Paulo 1983-01-01
• Series: Brazilian Journal of Oceanography
• Subjects: Fitoplâncton; Cinética; Nitratos; Amonio; Crescimento; Clorofilas; Nutrientes minerais; Fatores limitantes; Contagem de célula; Fluorescencia; Phaeodactylum tricornutum; Ubatuba; SP; Phytopiankton; Kinetics; Nitrates; Ammonium; Growth; Chlorophylls; Nutrients (mineral); Limiting factors; Cell counting; Fluorescence
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87591983000100009

The phytoplankton Ks anã Vmax as a function of ammonium and nitrate concentrations were determined. The growth rate was estimated from measurements on synthesized chlorophyll-&#945; and the cell number in the. culture media. The uptake rate was determined as to the consumption of ammonium and nitrate after the nutrients depletion from culture media.<br>Foram determinadas a Ks e a Vmax do fi toplancton natural, em função da concen tração de amonia e nitrato. A velocida de de crescimento foi determinada como clorofila-a sintetizada e numero de cé lulas no meio de cultura. A velocidade de assimilação foi determinada como o consumo de amonia e nitrato depois do esgotamento desses nutrientes do meio de cultura.