Počet záznamů: 1

Importance of dissolved organic carbon for phytoplankton nutrition in a eutrophic reservoir

  1. 1.
    0340601 - BC-A 2010 RIV GB eng J - Článek v odborném periodiku
    Znachor, Petr - Nedoma, Jiří
    Importance of dissolved organic carbon for phytoplankton nutrition in a eutrophic reservoir.
    Journal of Plankton Research. Roč. 32, č. 3 (2010), s. 367-376 ISSN 0142-7873
    Grant CEP: GA ČR(CZ) GP206/07/P407; GA ČR(CZ) GA206/06/0462; GA ČR(CZ) GA206/05/0007; GA AV ČR(CZ) 1QS600170504
    Výzkumný záměr: CEZ:AV0Z60170517
    Klíčová slova: mixotrophy * phytoplankton * PDMPO * DOC * autoradiography * diatoms
    Kód oboru RIV: DA - Hydrologie a limnologie
    Impakt faktor: 1.749, rok: 2010

    We performed 4 experiments with size fractionated phytoplankton organic C uptake in a eutrophic Římov Reservoir. Samples from surface and euphotic depth were incubated at in situ depths in light and dark bottles arrangement with 3H amino acids and glucose. Moreover, we measured silica deposition and chlorophyll content in diatom cells without and with glucose. Phytoplankton uptake of both substrates was low regardless the incubation depth. Thus, mixotrophic nutrition of the phytoplankton was of low importance under natural conditions. However, glucose addition in micromolar concentrations resulted in asignificant increase in diatom silification rates in a light bottle variant. Interestingly, chlorophyll fluorescence in diatom cells markedly decreased after the glucose addition indicating a potential restructuring of cell metabolism to benefit from a remarkably high concentration of available organic C in the environment.
    Trvalý link: http://hdl.handle.net/11104/0183811