湖沼有機物動態における微生物ループでの原生動物の役割

概要

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The author reviewed the ecological roles of heterotrophic nanoflagellates (HNF) and ciliates in freshwater pelagic environments, focusing especially on their roles as consumers of microbial plankton, food resources for zooplankton, and regenerators of inorganic nutrients. HNF and ciliates are important consumers of heterotrophic and autotrophic picoplankton, and are subsequently consumed by rotifer and crustaceans. Since the nutrient content of these protists is relatively high among other planktonic organisms, they serve as nutritious food for zooplankton. Nutrient release from the protists can be explained using stoichiometry. Nutrient regeneration by the protists is substantial in the nitrogen and phsphorus cycles of aquatic ecosystems. However, there is still some controversy over the relative importance of protists as food for zooplankton or regenerators of nutrients. This depends on prey selection by zooplankton and the vulnerability of coexisting phytoplankton to zooplankton grazing.
日本生態学会の論文
2000-04-25