Field estimates of zooplankton community grazing in the limed Lago d'Orta (Italy) by the use of a radioisotope-free technique |
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Authors: | Waleed Hamza Marina Manca Delio Ruggiu |
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Institution: | (1) CNR- Istituto Italiano di Idrobiologia, Pallanza, Italy;(2) Present address: Oceanography Dept., Faculty of Science, Alexandria University, Egypt |
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Abstract: | Grazing experiments were carried out in a limed lake (Lago d'Orta) during the periods, 23–24 March and 28–29 June 1990. A
simple in situ technique based on cell counts before and after incubation was used in order to evaluate the impact of the natural zooplankton
community on the lake phytoplankton. An estimation of the daily consumption by the natural zooplankton community showed that
about 4.6% and 1.04% of the standing algal biomass was removed during March and June respectively. The differences in grazing
activities were likely due to the difference in zooplankton community structure and to the surrounding environmental conditions,
mainly influenced by the liming intervention, started in the lake water since 1989. |
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Keywords: | community grazing filtering feeding selectivity liming |
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