The effect of sedimentation and microbial nitrogen regeneration in a plankton community: a simulation investigation |
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Authors: | Moloney CL; Bergh MO; Field JG; Newell RC |
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Institution: | Marine Biology Research Institute, Department of Zoology, University of Cape Town Rondebosch 7700, South Africa
Institute for Marine Environmental Research, Prospect Place Plymouth PL1 3DH, UK |
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Abstract: | A computer simulation model was developed to investigate nitrogenfluxes associated with microbial interactions in plankton communities.A short time scale was used, appropriate to the build-up anddecline of phytoplankton blooms in temperate shelf waters aftera mixing or upwelling event. The model depicts a continuum ofevents, many of which have been observed in coastal, upwellingand oceanic systems, including two phytoplankton peaks correspondingto new production and regenerated production.It predicts that nitrogen loss through sedimentation of phytoplanktonand faeces may result in a smaller bloom with a delayed onsetand prolonged duration. Microbial regeneration of nitrogen wasfound to be important in sustaining the middle stages of a phytoplanktonbloom, whereas micro- and meso-zooplankton regeneration occurredtowards the end of the bloom. |
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