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P. Castelnaeana, Error bars represent external reproducibility (2 SD) Human hair ? 202 Hg 464 is enriched in heavy Hg isotopes by +2.0 ± 0.2 ? relative to the P. fasciatum, the dominant fish species 465 in the diet of the Copacabana population, Conversely, hair ? 201 Hg is not significantly different from fish 466 ? 201 Hg, p.467

. Beni and . Beni-floodplain, Granja floodplain lake), slope = 1.28 ± 0, p.469

V. Copacabana, Eyiyoquibo (population B) from Beni river basin Error bars represent external reproducibility

P. Castelnaeana, Error bars represent external reproducibility (2 SD) Human hair ? 202 Hg 494 is enriched in heavy Hg isotopes by +2.0 ± 0.2 ? relative to the P. fasciatum, the dominant fish species 495 in the diet of the Copacabana population, Conversely, hair ? 201 Hg is not significantly different from fish 496 ? 201 Hg

. Beni and . Beni-floodplain, Granja floodplain lake), slope = 1.28 ± 0

V. Copacabana, Eyiyoquibo (population B) from Beni river basin Error bars represent external reproducibility