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Hashihama Lab
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The lab traces the fate of nutrients and organic matter in the ocean to uncover how biogenic elements cycle.
AboutAbout the lab
Exploring how biogenic elements cycle through the ocean
The Hashihama Lab, part of the Biogenic Element Dynamics Group at the Atmosphere and Ocean Research Institute, studies how biogenic elements such as carbon, nitrogen, and phosphorus cycle through the ocean.
The cycling of biogenic elements results from the interplay of transformations by marine organisms and the transport of materials by seawater movement, and it has a major influence on the global environment and ecosystems.
Fieldwork aboard research vessels is the core of the lab's work, including cruises that traverse the Pacific and Indian Oceans and monitoring in the seas around Japan.
Using highly sensitive analytical methods capable of measuring extremely low nutrient concentrations, the lab investigates the cycling of biogenic elements in nutrient-poor ocean regions.
Key terms
- Biogenic elements
- Elements such as carbon, nitrogen, phosphorus, and sulfur that are found in the cells of all living organisms
- Nutrients
- Compounds of nitrogen, phosphorus, silicon, and other elements dissolved in seawater, which are essential for the growth of phytoplankton
- Primary production
- The process by which phytoplankton and other organisms use photosynthesis to produce organic matter from carbon dioxide
ResearchResearch themes
The lab clarifies the scale and variability of biogenic element cycling in a variety of marine environments through observations from research vessels and field surveys. It also seeks to deepen understanding of the mechanisms that govern this cycling through laboratory process studies.
*Illustrative imageHigh-sensitivity, high-precision analysis of biogenic elements
The lab develops and introduces highly sensitive, high-precision analytical methods to clarify the cycling of nutrients and other biogenic elements in ocean regions where their concentrations are extremely low.
*Illustrative imageNutrient dynamics
The lab clarifies how the nutrients that drive ocean primary production are supplied, using wide-area observations from research vessels and time-series monitoring.
*Illustrative imageOrganic matter dynamics
The lab clarifies the dynamics of organic matter in the ocean, which is important as a site of carbon dioxide uptake, by combining wide-area observations from research vessels, time-series monitoring, and incubation experiments.
MembersFaculty
The members of the Biogenic Element Dynamics Group consist of faculty members, technical assistants, technical specialists, academic specialists, and master's students.As of 2026
- Associate ProfessorFuminori Hashihama
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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: “Phytoplankton bloom in the North Pacific Ocean (MODIS )” Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
- High-sensitivity, high-precision analysis of biogenic elements: “DU640 spectrophotometer” TimVickers / Public domain (cropped)
- Nutrient dynamics: “Phytoplankton Bloom Near Japan” NASA / Public domain (cropped)
- Organic matter dynamics: “Engineer controlling the crane for Niskin bottle” Kertu Liis Krigul / CC BY-SA 4.0 (cropped)
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