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• W2023185731 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 180:81-91 (1999) - doi:10.3354/meps180081 Inorganic carbon availability and the growth of large marine diatoms Joel C. Goldman* Department of Ocean Sciences, University of California, Santa Cruz, California 95060, USA *E-mail: jgoldman@cats.ucsc.edu ABSTRACT: To address the question of whether free CO2 can be a growth-limiting nutrient in oceanic waters 3 large marine diatoms, Stephanopyxis palmeriana (Greville) Grunow, Ditylum brightwellii (T. West) Grunow in Van Heurck 1883, and Coscinodiscus sp., were grown in pH-drift experiments under batch culture conditions. The cultures were maintained under quiescent conditions without added buffer in the growth medium, allowing the pH to rise and the free CO2 concentration to fall as growth proceeded. Growth rates were constant for sustained periods and only decreased as the pH rose to as high as 8.5-8.6 and the free CO2 concentration fell to ~4 µmol l-1. Such a low free CO2 concentration is far below the expected half saturation coefficient for ribulose biphosphate carboxylase-oxygenase (RUBISCO) and suggests that these species were capable of utilizing HCO3- in some fashion so as not to allow free CO2 to become growth-limiting. Additional experiments were conducted with these and other diatoms to demonstrate that turbulent mixing at high pH levels had no effect on inorganic carbon uptake or growth rate and that HCO3- uptake probably was occurring. Turbulent mixing should have enhanced inorganic carbon uptake by lowering diffusion gradients had these species been obligate users of free CO2. These species, being the most susceptible to diffusion-controlled uptake of free CO2 because of their long diffusion paths, represent the worst case scenario for free CO2 limitation. Finally, by developing a chemical-biological model it was possible to show that, in order for the pH of marine waters to rise even several tenths above ambient levels, biomass concentrations must increase to levels that are never found, except possibly on occasion in estuarine or coastal waters. Thus it seems unlikely that free CO2 limits phytoplankton growth in the oceans. KEY WORDS: Inorganic carbon availability · pH levels · HCO3- uptake · Growth · Large marine diatoms Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 180. Publication date: May 03, 1999 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1999 Inter-Research." @default.
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