Fig 6. Biplots of Nisqually River Delta invertebrate and fish stable isotope signatures.

To minimize variance and source overlap, invertebrates (Table 2) have been consolidated into coarser source groupings as follows: “riverine insects” (T1), “marsh insects” (T2), “riverine/marsh shoreflies and shorebugs” (T3/4/5), “riverine dipterans” (T6), “marsh dipterans” (T7), “riverine/marsh isopods” (A1/2), “delta mysids and shrimp” (A5/6), “riverine benthics” (B1/4/5), “marsh crustaceans” (B2), “delta crustaceans” (B3), and “delta polychaetes” (B6). Mean δ¹³C, δ¹⁵N, and δ³⁴S values are adjusted for trophic fractionation based on estimates from Davis et al. [68]. Error bars represent ± 1 SD.