(a) Río de la Plata estuarine area (Argentina–Uruguay). The yellow line represents the modal position of the turbidity front (from Framiñan and Brown, 1996) which is
a proxy of the bottom salinity front position. The black dashed line indicates an approximate position of the surface salinity front (Mianzan et al., 2001; Cabreira et al., 2006).
Black star indicates the location where green turtles were caught as bycatch in a gillnet fishery, providing material for the digestive tracts sampling.