Stable isotope A) δ¹⁵N − δ¹³C, B) δ¹⁵N − δ³⁴S and C) δ¹³C − δ³⁴S biplots showing variation in individual values for rainbow trout liver (brown filled circles), muscle (orange filled circle), and putative prey (filled triangles) from different habitats. Note that these are data uncorrected for trophic discrimination, and that δ¹³C values for rainbow trout (but not their prey) have been corrected for lipid effects.