Figure 1

The δ¹³C and δ¹⁵N values of individual fish (muscle tissue) and the estimated isotopic niches of catfish (black) and pike (red) in Milada and Most lakes, illustrated as sample-size-corrected SEAc ellipse areas³⁶. The mean ± SD δ¹³C and δ¹⁵N values of putative semiaquatic and aquatic food resources are also shown.