2000 Fiscal Year Final Research Report Summary
FACTORS CONTRORING THE EFFICIENCY OF THE BIOLOGICAL PUMP IN THE COASTAL EUPHOTIC ZONE-ANALYSIS FROM BIOLOGICAL, ELEMENTAL AND ORGANIC MOLECULES-
| Project/Area Number |
11440226
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生態
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| Research Institution | UNIVERSITY OF TSUKUBA |
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Principal Investigator |
HAMA Takeo UNIVERSITY OF TSUKUBA, INSTITUTE OF BIOLOGICAL SCIENCES, ASSOCIATE PROFESSOR, 生物科学系, 助教授 (30156385)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Yukuya TOKYO UNIVERSITY OF FISHERIES, DEPARTOMENT OF FISHERIES, PROFESSOR, 水産学部, 教授 (70114220)
INOUE Isao UNIVERSITY OF TSUKUBA, INSTITUTE OF BIOLOGICAL SCIENCES, PROFESSOR, 生物科学系, 教授 (70168433)
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| Project Period (FY) |
1999 – 2000
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| Keywords | BIOLOGICAL PUMP / PRIMARY PRODUCTION / EXPORT PRODUCTION / PHYTOPLANKTON / VERTICAL TRANSPORT / CARBOHYDRATES |
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| Research Abstract |
The field observation in Sagami Bay and off Shimoda, Japan has been carried out to assess the seasonal changes in the primary productivity and the composition of photosynthetic products. The relation between the primary production process and the vertical transport process of organic matter has been also studied.
1) The primary productivity at the center of the Sagami Bay showed maxim in October and April. This strongly suggests that the primary productivity primary depended on the supply of the nutrients due to the vertical mixing of water mass.
2) The contribution of carbohydrates in the photosynthetic products tended to increase in summer period. Nutrient depletion in upper layer in summer is likely resulted in the increase in the contribution of carbohydrates.
3) The export ratio, which is calculated from the production rate and the sinking rate of organic matter measured off Shimoda, exhibited unusual high values around 1. The lateral transport and resuspension of sediment organic matter are probably main reasons of the high export ratio.
4) Carbohydrates showed the high export ratio more than 1, fatty acids, on the other hand, exhibited the low export ratio around 0.3. This results clearly shows that carbohydrates concerns the formation of the sinking particles and play an important roles in the vertical transport of organic materials.
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