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Nishida Lab
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The lab reads the history of the ocean environment and the evolution of marine life from the chemistry of shells and bones.
AboutAbout the lab
The history of the ocean and the Earth, recorded in shells.
The Nishida Lab studies how the ocean environment has changed over time, using the calcium carbonate shells and bones formed by shellfish, corals, fish, and other organisms.
The lab investigates how global warming and ocean acidification, driven by rising carbon dioxide from human activities, affect shell-forming organisms.
By measuring the stable isotope ratios and elemental composition of shells, the lab reconstructs the water temperature and environmental conditions of the time.
The lab's goal is to clarify how changes in the marine environment, from the past through the present to the future, are related to the evolution of calcifying organisms.
Key terms
- Stable isotope ratio
- The mixing ratio of atoms of the same element that differ in weight. It is used as a marker of water temperature and the environment.
- Ocean acidification
- The phenomenon in which carbon dioxide in the atmosphere dissolves into the sea and seawater shifts toward the acidic side.
- Calcifying organisms
- Living things, such as shellfish and corals, that build shells or skeletons of calcium carbonate.
NewsLab news
A paper by Associate Professor Nishida and colleagues was published in Limnology and Oceanography Letters
Associate Professor Nishida received the Young Scientists' Prize in the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology
ResearchResearch themes
Using marine organisms with calcium carbonate shells as study material, the lab focuses on the interrelationship between changes in the marine environment, from the past through the present to the future, and the evolution of calcifying organisms. With the aim of contributing its results to global environmental issues and conservation, the lab also develops analytical techniques for stable isotope ratios, which are widely used as environmental proxies.
*Illustrative imageReading the environment from shell chemistry
The lab evaluates the stable isotope ratios and elemental composition of biogenic carbonates as indicators of the environment and of metabolism. Its work includes validating the oxygen isotope thermometer through rearing experiments and estimating the migration routes of fish from their otoliths.
*Illustrative imageDeveloping isotope analysis techniques
In addition to evaluating the isotopic values of international reference materials, the lab is developing methods for isotope analysis of organisms' body fluids and for carbonate clumped isotope (Δ47) analysis.
*Illustrative imageEvolution of shell microstructure
The lab describes and classifies the fine structures of shells, and investigates their phenotypic plasticity and how water temperature influences the way these structures form.
*Illustrative imageEffects of warming and ocean acidification
Through rearing experiments, the lab evaluates how water temperature affects the shell growth of corals and shellfish, and how ocean acidification affects shellfish and corals.
MembersFaculty
- Associate ProfessorKozue NishidaPublications ↗
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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: “DFC 4386 A close-up of a pile of fresh cockles their ridged shells glinting with shades of brown and white” PattayaPatrol / CC BY-SA 4.0 (cropped)
- Reading the environment from shell chemistry: “Black rockfish otolith cross section - USGS” Vanessa von Biela/USGS / CC BY-SA 3.0 (cropped)
- Developing isotope analysis techniques: “EA-IRMS, isotope ratio mass spectrometer with elemental analyzer for the determination of isotope ratios of stable isotopes in wines, spirits, honey and natural sweeteners, in CAFIA laboratory” Sarka Na kopci / CC BY-SA 4.0 (cropped)
- Evolution of shell microstructure: “Bruchfläche eines Perlmuttstücks” Fabian Heinemann / Public domain (cropped)
- Effects of warming and ocean acidification: “Coral (Galaxea fascicularis), mar Rojo, Egipto, , DD 128” Diego Delso / CC BY-SA 4.0 (cropped)
- Related lab (中丸研究室): “Social Network Visualization” Martin Grandjean / CC BY-SA 4.0 (cropped)
- Related lab (中村隆志研究室): “Coral Outcrop Flynn Reef” Toby Hudson / CC BY-SA 3.0 (cropped)
- Related lab (江頭研究室): “Colonne distillazione” User:Luigi Chiesa / CC BY 3.0 (cropped)
- Related lab (高橋邦夫研究室): “Water droplets on stromanthe leaf” Louyiihn / CC BY 4.0 (cropped)
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