Seawater carbonate chemistry, cell numbers and growth rate during experiments with dinoflagellates, 2007 ...

• Main Authors: Hansen, Per Juel, Lundholm, Nina, Rost, Björn
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2007
• Subjects: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Ceratium lineatum; Chromista; Growth/Morphology; Laboratory experiment; Laboratory strains; Myzozoa; Not applicable; Pelagos; Phytoplankton; Prorocentrum minimum; Single species; Experiment; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.819627; https://doi.pangaea.de/10.1594/PANGAEA.819627

The effects of dissolved inorganic carbon (DIC) on the growth of 3 red-tide dinoflagellates (Ceratium lineatum, Heterocapsa triquetra and Prorocentrum minimum) were studied at pH 8.0 and at higher pH levels, depending upon the pH tolerance of the individual species. The higher pH levels chosen for experiments were 8.55 for C. lineatum and 9.2 for the other 2 species. At pH 8.0, which approximates the pH found in the open sea, the maximum growth in all species was maintained until the total DIC concentration was reduced below ~0.4 and 0.2 mM for C. lineatum and the other 2 species, respectively. Growth compensation points (concentration of inorganic carbon needed for maintenance of cells) were reached at ~0.18 and 0.05 mM DIC for C. lineatum and the other 2 species, respectively. At higher pH levels, maximum growth rates were lower compared to growth at pH 8, even at very high DIC concentrations, indicating a direct pH effect on growth. Moreover, the concentration of bio-available inorganic carbon (CO2 + ... : Supplement to: Hansen, Per Juel; Lundholm, Nina; Rost, Björn (2007): Growth limitation in marine red-tide dinoflagellates: effects of pH versus inorganic carbon availability. Marine Ecology Progress Series, 334, 63-71 ...