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In the pond, most of the sestonic particles were edible size (<30 mu m), and sestonic C:P and N:P ratios were high at low zooplankton biomass but low at high zooplankton biomass, suggesting that the zooplankton activity is one of the important factors inducing changes in seston stoichiometry. This possibility was substantiated by grazer gradient experiments that showed a significant increase in the relative P content of the seston with increasing zooplankton biomass. The response of sestonic elemental ratios to simulated grazing revealed that the zooplankton can affect seston stoichiometry by increasing the per capita availability of a deficient nutrient for phytoplankton through grazing as well as nutrient release. 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