4. DISCUSSION
With accelerating global and regional environmental changes, identifying the properties and changes of food webs, including trophic niche partitioning among marine consumers, it is important to understand the resulting changes in biological systems. Here, we provide a systematic assessment of the potential of CSIA compared to traditional bulk C and N isotope analysis to elucidate resource partitioning and trophic niche differentiation of consumers in the Baltic Sea, a rapidly changing sea with a strong spatial environmental gradient.