Figure 3. Mercury biomagnification in fish assemblage of three rivers from the Iténez basin (Amazon, Bolivia).

Biplots display mean values (± sd in error bars) of Trophic Position (derived from δ¹⁵N) and [Hg]_ww of detritivore (1 = Curimatella cf. alburna, 2 = Psectrogaster sp.), herbivore (3 = Schizodon fasciatus), insectivore (4 = Triportheus angulatus) and piscivore (5 = Pseudoplatystoma sp., 6 = Pygocentrus nattereri, 7 = Hoplias malabaricus and 8 = Acestrorhynchus sp.) fish species. Slope of the relation correspond to biomagnification along the food chain.