On the basis of the field observations of water quality characteristics of the Seto Inland Sea by Hashimoto et al. (1996), the seasonal variations in standing stocks of DIN, PON, DIP, POP and Si, and the characteristics of lower trophic level ecosystem in the Seto Inland Sea are discussed. The standing stock ratios of DIP, DOP, and POP are almost same, about 30%, on annual average. Primary production is generally limited by DIP in the eastern part of the Seto Inland Sea, and by DIN in the western part.
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