Evidence of mercury biomagnification in the food chain of the cardinal tetra Paracheirodon axelrodi (Osteichthyes: Characidae) in the Rio Negro, central Amazon, Brazil - Marshall, Bruce G; Forsberg, Bruce R; Thomé-Souza, M; Peleja, R; Moreira, Marcelo Zacharias; Freitas, C. E. C (Journal of Fish Biology, 2016)