We studied the ecological role of choanoflagellates of the genus Salpingoeca found attached to the colonial diatoms Asterionella formosa and Fragilaria crotonensis in the Římov reservoir (South Bohemia). The choanoflagellate was found to be a highly efficient planktonic bacterivore. In 2 experiments we estimated in situ rates of bacterivory using fluorescently labeled bacteria as tracers. Taxon-specific uptake rates of Salpingoeca sp. were 35-65 bacteria per flagellate per hour. Overall, across all experimental treatments grazing of Salpingoeca sp. accounted for 11-64% of total protistan grazing and for 6-49% of daily removal rate of bacterial standing stock. Our data indicate that given the sufficient abundance of suitable host algae, possibly providing a refuge from potential grazers, and efficient control of free-swimming heterotrophic nanoflagellates by zooplankton grazing, this single choanoflagellate taxon can be temporarily the most important pelagic bacterivore.
Pracoviště
Hydrobiologický ústav (do r. 2005)
Kontakt
Václava Lavičková, lavickova@hbu.cas.cz, Tel.: 387 775 889
Rok sběru
2005
Počet záznamů: 1
openseadragon
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