I got it from my mother: Inter-nest variation of mercury concentration in neonate Smooth-fronted Caiman (Paleosuchus trigonatus) suggests maternal transfer and possible phenotypical effects

The deleterious effects of mercury (Hg) contamination are well documented in humans and wildlife. Chronic exposure via diet maternal transfer two pathways which increase the toxicological risk for wild populations. However, few studies examined physiological impact Hg crocodilians. We investigated neonate Smooth-fronted Caimans, Paleosuchus trigonatus , use keratinized tissues blood to evaluate transfer. Between November 2017 February 2020, we sampled 38 neonates from 4 distinct nests. Mercury concentration was measured claws, scutes total blood. Highest concentrations were found claws. Strong inter-nest variations (Hg ranging 0.17 ± 0.02 0.66 0.07 ?g.g ?1 dw) presumably reflect Reduced body size characterized by elevated suggests an influence during embryonic development. emphasize claws as alternative egg collection investigate Our results demonstrated need further investigation first life stages • Total . Claw sampling quantify through Effects on neonates.