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Marine Station Lab (Nakaoka and Isada)
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A lab that studies eelgrass bed and seaweed bed ecosystems in the waters of Akkeshi.
AboutAbout the lab
Studying a cold-current sea in its entirety.
Akkeshi Marine Station is located on Akkeshi Bay in eastern Hokkaido, and its research centers on marine ecology and biological oceanography.
In front of the station lies a sea influenced by the cold Oyashio Current, along with Lake Akkeshi where eelgrass grows in dense stands, as well as wetlands, rivers, and forests.
Based on field observations, the lab studies the biodiversity of eelgrass beds and kelp forests, the growth of phytoplankton, and more.
Founded in 1931, it is a marine station that focuses mainly on cold-current organisms, where researchers and students from Japan and abroad stay to carry out research and training.
Key terms
- Eelgrass beds
- Shallow seas where eelgrass, a type of seagrass, grows in dense stands. They serve as habitat and nursery grounds for many organisms.
- Biological oceanography
- The study of how marine organisms relate to the movement of water and materials.
- Phytoplankton
- Tiny organisms that drift in the water and photosynthesize. They are the starting point of the marine food chain.
NewsLab news
View More ↗ResearchResearch themes
Akkeshi Marine Station focuses on research in marine ecology and biological oceanography. It covers coastal ecosystems broadly, from the biodiversity of eelgrass beds and kelp forests to the growth of phytoplankton and the movement of dissolved organic matter.
*Illustrative imageCoastal Biological Communities and Environmental Change
The lab studies the mechanisms by which biological communities fluctuate, and how ecosystems function, in coastal ecosystems such as rocky intertidal zones and eelgrass beds. Across scales from small spaces to the whole planet, it aims to assess and predict changes caused by environmental change.
*Illustrative imagePhytoplankton and Changes in Photosynthesis
The lab studies changes in phytoplankton communities and primary production (photosynthesis) that accompany changes in the marine environment. By combining shipboard observations with satellite remote sensing, it evaluates their role in material cycles.
*Illustrative imageForests, Rivers, the Sea, and Phytoplankton
In coastal seas, various environments and organisms interact in complex ways, and little is known about the mechanisms behind phytoplankton fluctuations. Considering the influence of forests, the sea, and the rivers that connect them, the lab studies the role of phytoplankton in material cycles.
MembersFaculty
The members of Akkeshi Marine Station are faculty, technical specialists, postdoctoral researchers, academic researchers, technical assistants, doctoral and master's students, and administrative staff, technical support staff, and secretaries.As of 2026
- ProfessorMasahiro Nakaoka
- Associate ProfessorTomonori Isada
- Project Assistant ProfessorIppei Suzuki
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Zostera marina - iNaturalist.org(1)” Brew, John / CC BY 4.0 (cropped)
- Coastal Biological Communities and Environmental Change: “Zostera marina - iNaturalist.org” Nozères, Claude / CC BY 4.0 (cropped)
- Phytoplankton and Changes in Photosynthesis: “NASA satellite view of Southern Ocean phytoplankton bloom” NASA / Public domain (cropped)
- Forests, Rivers, the Sea, and Phytoplankton: “Kiritappu peatland01” Miya.m / CC BY-SA 3.0 (cropped)
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