Analysis of primary production in the Seto Inland Sea, Japan, using a simple ecosystem model |
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| Authors: | Toshiya Hashimoto Hidetaka Takeoka |
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| Institution: | (1) Faculty of Applied Biological Science, Hiroshima University, 739-8528 Higashi-Hiroshima, Japan;(2) Faculty of Engineering, Ehime University, 790-8577 Matsuyama, Japan |
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| Abstract: | A simple model of lower trophic level ecosystem has been created to analyze possible environmental control of primary production
in eight sub-areas of the Seto Inland Sea. The primary production rates observed by Hashimotoet al. (1997a) in these sub-areas are well reproduced by the model, including horizontal processes such as horizontal transport
of nutrients and vertical processes such as vertical mixing, light intensity and sinking of particulate matter. Without taking
account of horizontal processes the model also successfully reproduces the observed primary production rates in some areas,
but if fails to reproduce those in the others. This shows that the relative importance of the horizontal transport on the
primary production differs are by area. Two time scales,T
z andT
H, are introduced to explain this difference.T
z is a vertical cycling time of material, which is defined as the time during which the stock of the material in the water
column is utilized for primary production;T
H is the horizontal transit time of the material. The relative importance of the horizontal process is well explained by theT
H/T
z ratio; that is, the horizontal transport process is important in the areas where this ratio is small. Further the possible
mechanisms of nutrient supply for the primary production in each sub-area are investigated using this model. |
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| Keywords: | Primary production ecosystem model Seto Inland Sea horizontal transport nutrients |
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