Stable isotope niches using corrected stable isotope data (δ¹³C to δ¹³C_corr (‰); Eq. (2; δ¹⁵N to trophic position (TP); Eq. (1) for Atlantic salmon (grey ellipses) and brown trout (black ellipses) in the River Teign sites (cf. Tab. 1 details and sample sizes, Fig. 3 for uncorrected data), where solid lines are fish sampled in September 2022, long dashes in July 2023 and short dashes in September 2023.