RESEARCH EXPERTISE
Stable Isotope Analysis
Tracing food-web relationships and ecological change in freshwater ecosystems
UNDERSTANDING AQUATIC FOOD WEBS
Following energy through freshwater ecosystems
Stable isotope analysis is a powerful tool for investigating feeding relationships and the movement of energy through aquatic food webs. By comparing isotope signatures among fish, invertebrates, and potential food sources, we can explore how organisms use resources and how their trophic relationships vary across habitats and environmental conditions. These insights help connect ecological processes with questions about freshwater conservation and management.
STEP 01
Collect
Sample fish, aquatic invertebrates, and other food-web components in the field.
STEP 02
Analyse
Use laboratory measurements of stable isotopes to characterize biological samples.
STEP 03
Interpret
Compare isotope patterns to investigate food sources, trophic relationships, and ecosystem change.
FIELD & LABORATORY
Our expertise in practice
Articles from the Lab

Edgar M.*, Kimmel, N. and M. S. Poesch. (2025) Community trophic structure within reservoirs change in the presence of invasive Chinese Mystery Snail (Cipangopaludina chinensis) and Northern Crayfish (Faxonius virilis). Aquatic Science 87: 99.

Roberts, K.N.*, Lund, T.*, Hayden, B. and M.S. Poesch (2022) Season and species influence stable isotope ratios between lethally and non-lethally sampled tissues in freshwater fish. Journal of Fish Biology 100 (1): 229-241.

Finn, K.*, Roberts, K.N.* and M.S. Poesch (2022) Cestode parasites are depleted in 15N relative to their fish hosts in northern Alberta, Canada. Fisheries Research 248: 106193..
