Relationships between δ¹³C values (left) or δ¹⁵N values (right) (‰) and total length (TL, cm) in meagre collected in 2010 for SIA (N = 21) and presenting a wide range of individual sizes. Results from the GGAM models (fitted to individual δ¹³C or δ¹⁵N values to identify size-related trends) are plotted on raw isotope data (i.e. 70% ethanol preserved) and TL data in the form of a smoother (i.e. polygon including 95% confidence interval), illustrating the modelled relationships between parameters (see text).