Holen, D. A. Penn State University, Dah13@psu.edu
, . A. ,
THE ABUNDANCE, BIOVOLUME AND VERTICAL DISTRIBUTION OF PLASTIDIC AND HETEROTROPHIC CILIATES IN AN OLIGOTROPHIC LAKE.
The vertical distribution, abundance and biovolume of plastidic and heterotrophic ciliates were studied in a small oligotrophic lake in northeast Pennsylvania. Ciliate abundances tended to decrease with depth with plastidic ciliates comprising on average 61% and 53% of the total ciliate fauna during July and August. The biovolume of plastidic ciliates contributed on average 90% and 83% of the total ciliate biovolume, respectively. Plastidic ciliates were represented by Strombidium spp. and other pigmented oligotrichs. Grazing experiments conducted in August, using fluorescently-labeled beads (0.50-micrometer-diameter), suggested that ciliate bacterivory removed 70% of the bacterial standing stock per hour. Plastidic ciliates were responsible for 63% of total ciliate bacterivory.
Day: Wednesday, Feb. 3
Location: Sweeney Center