Stable Isotope Ecology Research Team
  Marine ecosystems composed of various organisms are formed through complex prey-predator interactions. Modern marine ecosystems were produced by changes in the global environment.
Many organisms evolved ecologically with differing resource usage patterns, ecological niches, etc. However, the relations among marine ecosystems are very complicated. The Stable Isotope Ecology Research Team aims to clarify the trophic level of marine organisms to understand food web structures in marine ecosystems based on the stable isotope analysis technique, which measures nitrogen isotope ratios within amino acids. The nitrogen isotope ratio of amino acids indicates the trophic level of organisms with much higher accuracy than possible with previous techniques. Combined analyses using stable isotopes of oxygen and carbon along with ecologic, biochemical, and molecular phylogenetic analyses will clarify the relationships among prey-predator interactions in marine organisms and illustrate the dynamics and evolution of marine ecosystems.
 
1) Understanding structures of marine ecosystems, we estimate prey-predator interactions
    (food web) with nitrogen isotope of amino acids.

2) Understanding host-symbiont interactions (narrowly-defined meaning of prey-predator
    interactions)

3) Multidisciplinary research on marine ecosystems with deep-sea biology, biogeochemisty,
    ecology, biochemistry, molecular ecology and biogeosciences.

Model of marine ecosystems:
a complex food web.
Trophic level estimation based on
nitrogen isotopes of amino acids.



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Stable Isotope Ecology Research Team Japan Agency for Marine-Earth Science and Technology
2-15 Natsushima-Cho,Yokosuka Kanagawa 237-0061
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