| Project/Area Number |
10045057
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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 |
General fisheries
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| Research Institution | Kokkaido University |
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Principal Investigator |
IKEDA Tsutom Hokkaido Univ., Grad. School of Fisheries Sciences, Prof., 大学院・水産科学研究科, 教授 (80281799)
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| Co-Investigator(Kenkyū-buntansha) |
SAITOH Sei-ichi Hokkaido Univ., Grad. School of Fisheries Sciences, Prof., 大学院・水産科学研究科, 教授 (70250503)
IIDA Koji Hokkaido Univ., Grad. School of Fisheries Sciences, Prof., 大学院・水産科学研究科, 教授 (40142707)
MIURA Teisuke Hokkaido Univ., Grad. School of Fisheries Sciences, Prof., 大学院・水産科学研究科, 教授 (60002094)
SHIGA Naonobu Hokkaido Univ., Grad. School of Fisheries Sciences, Asso. Prof., 大学院・水産科学研究科, 助教授 (30091466)
SAKURAI Yasunori Hokkaido Univ., Grad. School of Fisheries Sciences, Asso. Prof., 大学院・水産科学研究科, 助教授 (30196133)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 2000: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | marine ecosystem / Northeastern Pacific / micro nekton / sampling gears / ROV / dominant prey / food relationship / satellite observation |
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| Research Abstract |
From 1998 to 2000, in summer, we carried out field works in the Gulf of Alaska and Bering Sea using T/S Oshoro-Maru with collaboration of U.S.and Canadian Scientists for studying on ecosystems dynamics in the northeastern Pacific. We planed this joint study with University of Alaska and University of Washington which are one of sister faculties or universities. Outline of the research results is as follows :
(1) We studied the temporal and spatial variability of coccolithophore blooms in eastern Bering Sea shelf using ship and satellite observations.
(2) We carried out plankton sampling using various plankton net and studied quantitatively plankton community structure.
(3) Using non-selection gill net, we sampled higher trophic levels organisms to study community structure and food relationship. As a result, there was a lot of squid from salmon stomach contents and the importance of squid are emphasized.
(4) We carried out primary production measurements in eastern Bering Sea using 13C method. As a result, there was high productivity in the shelf break region as called "Green Belt" in compared with shelf region.
(5) We carried out cephalopod paralavae sampling in the Gulf of Alaska and eastern Bering Sea to study vertical distribution and latitudinal body-size gradients.
(6) We carried out micro-nekton sampling using mid-layer trawling in the Gulf of Alaska.
In 1998 and 2000, we had two one-day workshops at each port of T/S Oshoro-Maru. Workshop "Ecosystem Dynamics in the Northeastern Pacific and the Bering Sea" was held in Seattle 1998 and Workshop "Marine Ecological studies in the Bering Sea and eastern North Pacific" was held in Victoria 2000. U.S., Canadian and Japanese scientists could exchange the information of each scientific program.
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