Effectiveness of phytoplankton control by large-bodied and small-bodied zooplankton |
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Authors: | Dawidowicz Piotr |
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Affiliation: | (1) Department of Hydrobiology, Institute of Zoology, University of Warsaw, Nowy Swiat 67, 00-046 Warsaw, Poland |
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Abstract: | Employingin situ enclosures containing inocula of the lake zooplankton (mainlyDaphnia galeata, Daphnia cucullata andBosmina spp.) from a moderately eutrophic Lake Ros (Northern Poland) or large-bodiedDaphina magna, the following observations on succession of phytoplankton were made: 1) whereasD. magna could control the density of all the photoplankton size classes, the lake zooplankton could not suppress the large-sized phytoplankters or net phytoplankton; 2) the lake zooplankton was able to control the density of small algae (< 50μm), but its effect on large algae may be opposite: a promotion of net phytoplankton growth by removing small-sized algae which can out-compete net phytoplankton for limited PO4-P resources (<5μg P l−1). Since efficiency of phytoplankton density control byD. magna decreased with an increase in net phytoplankton abundance, biomanipulation could not be successful without introducing or maintaining a high population of large-bodied cladoceran species before high densities of large algae would make the control of phytoplankton inefficient. |
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Keywords: | Daphnia magna Daphnia galeata net phytoplankton nanoplankton biomanipulation enclosures |
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