期刊
HYDROBIOLOGIA
卷 584, 期 -, 页码 167-177出版社
SPRINGER
DOI: 10.1007/s10750-007-0575-z
关键词
micro-zooplankton; macro-zooplankton; filtration rate; grazing rate; edible phytoplankton; primary production
The grazing impact of different sized zooplankton on 'edible' and total phytoplankton biomass and primary production was measured in L. Vortsjarv during a seasonal study in 1998 and 2000. The organisms of 48-100 mu m size class, composed of ciliates and rotifers, contributed significantly to the total grazing of zooplankton community throughout the study period (average 68%). The average daily filtering and grazing rate of the whole zooplankton community (micro- and macro-zooplankton) remained low, corresponding to a filtration of 44% of the water volume, 4% of the total phytoplankton biomass and 29% of primary production. However, a strong grazing pressure on small-sized phytoplankton (< 30 mu m) was estimated in most of the study period (average 44% d(-1)). Among size classes of 'edible' phytoplankton, the size range 5-15 mu m was the most important algal food for the dominant zooplankton grazers (herbivorous ciliates, Polyarthra spp., Chydorus sphaericus and Daphnia cucullata) in L. Vortsjarv.
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