More information: Dirley Cortés et al, Top of the food chains: an ecological network of the marine Paja Formation biota from the Early Cretaceous of Colombia reveals the highest trophic levels ...

Analysis of individual amino acid (AA) δ15N values is increasingly common in studies of food web architecture, movement ecology, and biogeochemical cycling. However, observations that nitrogen isotope ...

Stable isotopes have helped uncover migratory routes, trophic levels, and the geographic ... sulfur to study shifts between marine and terrestrial food sources have focused on non-migratory ...