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  1. No Access

    Article

    Productivity and Growth of a Natural Population of the Smallest Free-Living Eukaryote under Nitrogen Deficiency and Sufficiency

    The influence of dissolved inorganic nitrogen (DIN) enrichments on cell-normalized carbon uptake rate, chlorophyll a content, and apparent cell size of a picoeukaryote (<1 μm) (Ostreococcus tauri, the smallest eu...

    E. Fouilland, C. Descolas-Gros, C. Courties, Y. Collos, A. Vaquer… in Microbial Ecology (2004)

  2. No Access

    Article

    Response of coastal phytoplankton to ammonium and nitrate pulses: seasonal variations of nitrogen uptake and regeneration

    Seasonal variation in uptake and regeneration of ammonium and nitrate in a coastal lagoon was studied using 15N incorporation in particulate matter and by measuring changes in particulate nitrogen. Uptake and reg...

    Y. Collos, A. Vaquer, B. Bibent, P. Souchu, G. Slawyk, N. Garcia in Aquatic Ecology (2003)

  3. No Access

    Article

    An optical method for the rapid measurement of micromolar concentrations of nitrate in marine phytoplankton cultures

    This method of nitrate determination by ultraviolet absorption spectrometry is based on the measurement of sample absorbance at a single wavelength (220 nm), which was chosen on the basis of the absorption spe...

    Y. Collos, F. Mornet, A. Sciandra, N. Waser, A. Larson… in Journal of Applied Phycology (1999)

  4. No Access

    Article

    Automated procedure for determination of dissolved organic nitrogen and phosphorus in aquatic environments

    A method is described for estimating dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) in aquatic environments. The method is based on ultraviolet oxidation under successive acid and alka...

    Y. Collos, F. Mornet in Marine Biology (1993)

  5. No Access

    Article

    Carbon and nitrogen dynamics during growth and degradation of phytoplankton under natural surface irradiance

    Under conditions of natural irradiance, the development and decline of a flagellate-dominated phytoplankton population was followed in a coastal North Atlantic pond over a 3 d period in summer 1986. Irradiance...

    Y. Collos, C. Descolas-Gros, M. Fontugne, A. Mortain-Bertrand… in Marine Biology (1992)

  6. No Access

    Article

    Nocturnal synthesis and diurnal degradation of phytoplankton biomass in surface waters

    Natural populations of phytoplankton were collected near the Bay of Bourgneuf, France, in spring 1982, and were subjected to natural surface irradiance outdoors. They exhibited exponential growth on time scale...

    Y. Collos, S. Y. Maestrini, J. M. Robert in Marine Biology (1989)

  7. No Access

    Article

    Hydrobiological parameters during an annual cycle in the Arcachon Basin

    Temperature, salinity, nutrients and phytoplankton biomass were monitored on a weekly to bimonthly frequency at six stations in the Bay of Arcachon from July 1984 to July 1985. This particular period appears t...

    R. Robert, N. Guillocheau, Y. Collos in Marine Biology (1987)

  8. No Access

    Chapter

    Studies on Marine Autotrophs: Recommendations for the 1980s

    There was agreement among members of the working group that, in the next 5–10 years, the process-oriented focus of field studies should be maintained. This orientation is viewed as a third phase in the histori...

    L. Legendre, Y. Collos, M. Elbrächter… in Flows of Energy and Materials in Marine Ec… (1984)

  9. No Access

    Article

    Significance of cellular nitrate content in natural populations of marine phytoplankton growing in shipboard cultures

    Phytoplankton intracellular nitrate concentrations have been monitored in a 56-h experiment on a shipboard culture of surface sea water from an upwelling region. These measurements were related to parameters o...

    Y. Collos, G. Slawyk in Marine Biology (1976)

  10. No Access

    Article

    An automated assay for the determination of nitrate reductase in marine phytoplankton

    Nitrate reductase activity in marine phytoplankton has been assayed on a Technicon AutoAnalyzer®. A description of the automation is given with details of the apparatus and procedure. Twenty samples an hour can b...

    G. Slawyk, Y. Collos in Marine Biology (1976)

  11. No Access

    Article

    Blooms of surf-zone diatoms along the coast of the Olympic Peninsula, Washington. IV. Nitrate reductase activity in natural populations and laboratory cultures of Chaetoceros armatum and Asterionella socialis

    Nitrate reductase (NR) activity in the surf-zone diatom Chaetoceros armatum T. West was studied in its natural habitat at Copalis Beach, Olympic Peninsula, Washington (USA) over a period of 18 months. Variations ...

    Y. Collos, J. Lewin in Marine Biology (1974)