Stable isotopes of carbon and nitrogen (δ13C, δ15N) and fatty acids biomarkers are used as organic matter tracers in a wide range of environments, especially to study trophic relationships but also to follow biogeochemical processes. I have been using both techniques since 2013 during my master thesis and stable isotopes became the core tool of my research during my Ph.D. For the past two years, I kept playing with isotopes by learning new approaches measuring δ15N on amino acids and δ13C on fatty acids (CSIA: compound specific isotope analysis) in collaboration with Center for Physical Sciences and Technology in Vilnius (Lithuania).
Together, these techniques helped me to reveal pelagic fish larvae diet  and to understand the relationship between particulate organic matter and bacteria . I used these biomarkers, together with environmental data in numerical and statistical approaches (e.g. isotopic mixing models (MixSIAR), uni- and multivariate statistics), to reveal particulate organic matter origin and quantify its composition in coastal systems over the French littoral , ,  or to study changes in Mytilus edulis diet and body condition over the past 25 years in the Baltic Sea .