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• W1213940522 abstract "The biomass of phytoplankton, microzooplankton, copepods, and gelatinous zooplankton were measured in two tributaries of the Chesapeake Bay during the springs of consecutive dry (below average freshwater flow), wet (above average freshwater flow), and average freshwater flow years. The potential for copepod control of microzooplankton biomass in the dry and wet years was evaluated by comparing the estimated grazing rates of microzooplankton by the dominant copepod species (Acartia spp. and Eurytemora affinis) to microzooplankton growth rates and by calculating the percent of daily microzooplankton standing stock removed through copepod grazing. There were significant increases in phytoplankton and copepod biomass, but not for microzooplankton biomass in the wet year as compared to the dry year. The ctenophore Mnemiopsis leidyi was present during the dry year but was absent during the sampling period of the wet and average freshwater flow years. Grazing pressure on microzooplankton was greatest in the wet year, with Acartia spp. and E. affinis ingesting 0.21- 2.64 mg of microzooplankton C copepod 21 d 21 and removing up to 60% of the microzooplankton standing stock per day. In the dry year, these copepod species ingested 0.10-0.73 mg of microzooplankton C copepod 21 d 21 with a maximum daily removal of approximately 3% of the microzooplankton standing stock. Potential copepod grazing pressure was significantly less than microzooplankton growth in the dry year, but was equivalent to microzooplankton growth in the wet year, implying strong top-down control of the microzooplankton community in the wet year. These results suggest that increased grazing control of microzooplankton populations by more copepods in the wet year released top-down control of phytoplankton. Reduced microzooplankton grazing, in conjunction with increased nutrient availability, resulted in large increases in phytoplankton biomass in the wet year. Increased freshwater flow has the potential to influence trophic cascades and the partitioning of plankton production in estuarine systems." @default.
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• W1213940522 date "2007-01-01" @default.
• W1213940522 modified "2023-09-23" @default.
• W1213940522 title "Changes in Plankton Community Structure and Function in Response to Variable Freshwater Flow in Two Tributaries of the" @default.
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