Sensitivity analysis of a coastal marine ecosystem |
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| Authors: | Michio J Kishi Kisaburo Nakata Kimitoshi Ishikawa |
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| Institution: | (1) Ocean Research Institute, University of Tokyo, Minamidai 1-15-1, Nakano-ku, 164 Tokyo, Japan;(2) Department of Environmental Assessment, National Research Institute for Pollution and Resources, Yatabe-chô, Tsukuba-gun, 300-21 Ibarakipref., Japan |
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| Abstract: | An ecosystem with four compartments, i.e. PO4-P, phytoplankton, zooplankton and detritus, in a coastal region was considered. Sensitivity analysis of a phosphorus flow model in well-mixed water without currents concludes that (1) the maximal photosynthetic rate,V
m
, in Michaelis-Menten relation plays an important role in the distribution of biomass among compartments but the half saturation constant,K
s
, is not so important, (2) the natural death rate of phytoplankton is important for the ecosystem, (3) the natural death rate of zooplankton is also effective on the ecosystem.A numerical experiment was also performed on the ecosystem with four compartments are also studied using a dynamical barotropic model of tidal currents of Mikawa Bay (Japan). Diffusion coefficient in diffusion equation plays the role of a linear smoothing parameter in the horizontal distribution of compartment. On the other hand, perturbations of biological parameters cause nonlinear variations in the horizontal distribution of compartment. |
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