Fig. 1. Sampling sites in the São Paulo state. Site 2 is the Jurumirim Reservoir and Site 13 is the Salto Grande Reservoir. Samples collected in each site: 1. bivalve, sediment, water; 2. fish; 3. sediment, water; 4. sediment, water; 5. fish, sediment, water; 6. bivalve, sediment, water; 7. bivalve, fish; 8. sediment, water; 9. sediment, water; 10. bivalve, fish, sediment, water; 11. sediment, water; 12. bivalve, fish, sediment, water; 13. fish; 14. bivalve, sediment, water.