Trophic Ecology of Chaetognaths in the Barents Sea Revealed by Nitrogen Stable Isotope Analysis (δ15N)

Stable isotope analysis of nitrogen (δ15N) was applied to investigate the trophic ecology of the three chaetognath species inhabiting the Barents Sea (Parasagitta elegans, Eukrohnia hamata and Pseudosagitta maxima). For the first time, we provide detailed information on the inter- and intra-specific variability of their isotopic composition and trophic levels. Different size-related and depth-related trends were found among the studied species, which indicated differences in their feeding strategies.