Influence of sex, size and trophic level on blood Hg concentrations in Black caiman, Melanosuchus niger (Spix, 1825) in French Guiana

Lemaire, Jérémy; Bustamante, Paco; Marquis, Olivier; Caut, Stéphane; Brischoux, François

doi:10.1016/j.chemosphere.2020.127819

Cited by 17 publications

(13 citation statements)

References 50 publications

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“…This long-range atmospheric transport may also be responsible for the mercury accumulation in ingredients present in composition of the VMS analyzed in the present study. In addition, recent studies have observed the impact of this mercury transport on species from remote locations [ 81 – 83 ], which further justifies the hypothesis that in recent years, the combination of industrial activities and atmospheric transport has resulted in an increase in concentrations of mercury in soils [ 84 ]. According to Liu et al [ 84 ], with the increase in production and industrial use since the 19th century, pollution by mercury has intensified.…”

Section: Discussionmentioning

confidence: 66%

Vitamin-mineral supplements do not guarantee the minimum recommendations and may imply risks of mercury poisoning in dogs and cats

et al. 2021

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Given the importance of using the vitamin-mineral supplements to guarantee the minimum nutritional recommendations for pets in homemade foods, and hypothesizing that these products may contribute to toxic metals contamination, the present study aimed to determine the concentrations of essential minerals and toxic metals in vitamin-mineral supplements available in the Brazilian market and calculate if the amount recommended by the manufacturer guarantees the minimum recommendations of NRC (2006) and FEDIAF (2020), as well as calculating the amount of toxic metals that animals would consume, according to the amounts recommended by the manufacturer. Seven vitamin-mineral supplements were analyzed. The determination of essential minerals and toxic metals was performed using ICP-OES. Comparisons were made with the minimum recommendations for essential minerals, and with the maximum tolerated levels of toxic metals established by the FDA (2011), descriptively. Most of the vitamin-mineral supplements, in the quantities recommended by the manufacturers, do not guarantee the minimum recommendations of NCR (2006) and FEDIAF (2020) for the following elements: calcium, potassium, magnesium, sodium, phosphorus, selenium, and zinc. Only one supplement had detectable selenium concentrations. Three supplements provided more than 0.02mg of mercury/kg of body weight, the safe upper limit used to establish the maximum tolerated level of this element. It is concluded that most vitamin-mineral supplements do not meet the minimum recommendations for most essential minerals and, if formulated by untrained professionals, even with supplementation, homemade foods may still be nutritionally deficient. Furthermore, some vitamin-mineral supplements analyzed may imply risks of mercury poisoning in pets.

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Section: Discussionmentioning

confidence: 66%

Vitamin-mineral supplements do not guarantee the minimum recommendations and may imply risks of mercury poisoning in dogs and cats

et al. 2021

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“…So far, no variation in the Hg concentration of males and females was found, suggesting that the elimination of Hg by the female through egg laying could be marginal or non-detectable (e.g. Jagoe et al, 1998;Burger et al, 2000;Vieira et al, 2011;Riveira et al, 2016;Lemaire et al, 2021).…”

Section: Hg Concentration Between Nestsmentioning

confidence: 99%

“…In certain geographical areas (e.g., Amazon region), the abundant natural Hg in soil and biota (e.g. an average of 0.3 µg.g -1 in forest soil in French Guiana, Richard et al, 2000), human activities such as deforestation, gold mining activities and agriculture additionally contribute to increase Hg bioavailability (Roulet et al, 1998;Maurice-Bourgoin et al, 2000, Vieira et al, 2011Schneider et al, 2012;Correia et al, 2014;Eggins et al, 2015;Lázaro et al, 2015;Schneider et al, 2015;Rivera et al, 2016, Marrugo-Negrete et al, 2019, Lemaire et al, 2021.…”

Section: Introductionmentioning

confidence: 99%

“…Blood Hg concentration is thought to reflect relatively recent J o u r n a l P r e -p r o o f exposure, while keratinized tissues (e.g., scales and claws) seem to reflect Hg concentration accumulated during longer time periods (Schneider et al, 2015). Despite such tissue-specific variations in Hg burden, ingestion of contaminated food is thought to be the primary source of Hg exposure in crocodilians (Smith et al, 2007;Lemaire et al, 2021). Although relatively elevated Hg concentrations are found in crocodilians (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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

Lemaire

Marquis²,

Bustamante³

et al. 2021

Environmental Research

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

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“…Crocodilians, being apex predators, accumulate high levels of metal contaminants due to their life history characteristics (e.g. aquatic habitat, long lifespan, high trophic level, high tissue conversion rate) and can serve as indicators of ecosystem health (Yanochko et al, 1997, Vieira et al, 2011Schneider et al, 2015;Somaweera et al, 2020;Lemaire et al, 2021a). However, many crocodilians have a concerning conservation status, and populations of several species are currently decreasing (Targarona et al, 2008;Ferreira and Pienaar, 2011;Bezuijen et al, 2012;Van Weerd et al, 2016;Balaguera-Reina et al, 2018;Ortiz et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Lead, mercury, and selenium alter physiological functions in wild caimans (Caiman crocodilus)

Lemaire

Bustamante

Mangione

et al. 2021

Environmental Pollution

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Influence of sex, size and trophic level on blood Hg concentrations in Black caiman, Melanosuchus niger (Spix, 1825) in French Guiana

Cited by 17 publications

References 50 publications

Vitamin-mineral supplements do not guarantee the minimum recommendations and may imply risks of mercury poisoning in dogs and cats

Vitamin-mineral supplements do not guarantee the minimum recommendations and may imply risks of mercury poisoning in dogs and cats

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

Lead, mercury, and selenium alter physiological functions in wild caimans (Caiman crocodilus)

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