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Comparison of a Microbiological Model Simulation with Microcosm Data  

Lee, Jae-Young (OCEAN laboratory, School of Earth and Environmental Sciences(BK21), Seoul National University)
Tett, Paul (School of Life Sciences, Napier University)
Jones, Ken (Dunstaffnage Marine Laboratory)
Publication Information
Journal of the korean society of oceanography / v.39, no.4, 2004 , pp. 222-233 More about this Journal
Abstract
Using nitrogen as the limiting nutrient, the default version of a microplankton-detritus model linked chlorophyll concentration to the autotroph nitrogen. However, phosphorus dynamics were added to simulate the results of a microcosm experiment. Using standard parameter values with a single value of microheterotroph fraction in the microplankton taken from the observed range, the best simulation successfully captured the main features of the time-courses of chlorophyll and particulate organic carbon, nitrogen and phosphorus, with root-mean-square error equivalent to 29% of particulate concentration. A standard version of microbiological model assumes complete internal cycling of nutrient elements; adding a term for ammonium and phosphate excretion by microheterotrophs did not significantly improve predictions. Relaxing the requirement for constant microheterotroph fraction resulted in an autotroph-heterotroph model AH, with dynamics resembling those of a Lotka-Volterra predator-prey system. AH fitted the microcosm data worse than did MP, justifying the suppression of Lotka-Volterra dynamics in MP. The paper concludes with a discussion of possible reasons for the success of the simple bulk dynamics of MP in simulating microplankton behaviour.
Keywords
Microbiological Mode; Microcosm Experiment; Microplankton;
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