Abstract
The primary productivity in coastal water adjacent to the Kuroshio off Shimoda was measured as part of the International Biological Program. The total amount of chlorophylla in the euphotic zone varied widely from 20 mg/m2 to 60 mg/m2 throughout the year and the maximum values were measured in early summer. These values were higher than those in the Kuroshio but agreed with those in the Oyashio. Vertical differentiation of photosynthetic characteristics was well developed and it was strongly related to the stratification of the water column. The light-saturated photosynthetic rate of surface phytoplankton varied from 5.8 mg C/(mg chl.h) in May to 2.0 mg C/(mg chl.h) in January. These rates were higher than those in the Kuroshio. The daily primary production was estimated by the chlorophyll method. Highest value was 0.5–1.5 g C/(m2day) in early summer and the lowest was 0.2 g C/(m2day) in winter. The primary productivity in the coastal water studied accorded fairly well with that in the Oyashio.
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Contribution No. 239 from Shimoda Marine Biological Station. This study is part of JIBP project entitled “Studies on the Dynamic Status of the Biosphere”, a Special Research Project supported by the Ministry of Education.
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Shimura, S., Ichimura, Se. Primary productivity in coastal water adjacent to the Kuroshio off Shimoda. Journal of the Oceanographical Society of Japan 28, 8–17 (1972). https://doi.org/10.1007/BF02109751
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DOI: https://doi.org/10.1007/BF02109751