Overview
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Key numbers
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- supials (median = 0.136 mg kg−1) than in rodents (median = 0.032 mg kg−1, p = 0.0006). Arboreal rodents showed lower Hg
- murina (2.571 mg kg−1) showed the highest Hg concentrations, while in the rodent Sphiggurus roosmalenorum (n = 4),
- influenced by and contaminated by Hg in the Madeira River. was determined based on specialized literature (Table 1).
- relevance and sensitivity to environmental contamination, The samples were washed with 0.01% (w/v) ethylenediami-
- Table 1 Median levels of total mercury (mg/kg) and range in the fur of marsupials (Didelphimorphia) and rodents (Rodentia) from the area affected
- Coendou prehensilis 10 0.005 < LOD–0.229 Arboreal Frugivore/Granivore Patton et al. (2015)
- Isothrix bistriata 08 0.023 < LOD–0.073 Arboreal Herbivore Patton et al. (2015)
- Mesomys hispidus 02 0.011 < LOD–0.023 Arboreal Herbivore Patton et al. (2015)
- Sphiggurus roosmalenorum 04 < LOD – Arboreal Frugivore Patton et al. (2015)
- (1:1, HNO3:H2SO4; Merck®) was added and the samples ously decontaminated with a nitric acid bath (3%, Merck®).
- overnight. The following day drops of 12% (w/v) hydrox- was used for comparisons between orders, trophic guilds,
- USA). The THg concentration was determined Cold Vapor in the statistical analyses (n = 7). The significance level
- To ensure analytical quality and data reliability, reagent THg levels were determined for 63 individuals. The median
- were analyzed in duplicate. The recovery rate (113.5%) is morphia exhibited a peak concentration of 3.379 mg kg−1,
- al. 2006). The limit of detection (LOD) was 0.0001 mg kg−1, ference between the two orders (U = 50; p = 0.0006) (Fig. 1)
- and the limit of quantification (LOQ) was 0.001 mg kg−1. Regarding age classes within Rodentia, no significant dif-
- The LOD and LOQ were calculated using the expressions ference (p = 0.0838) in THg concentrations between adults
- (0.038 mg kg−1; n = 40) and juveniles (0.019 mg kg−1; n = 9).
- supials (n = 7) and rodents (n = 49) collected in the area surrounding mg kg−1) (Fig. 1) highlights the distinction between taxa
- rous rodents (U = 66.5; p < 0.0001) (Fig. 2a). Thus, it was murina and Marmosops sp. (Table 1) (Moyo 2020).
- (Table 1), a marsupial with habits ranging from insectivo- natural reservoirs of Hg in the Amazon, being one of the
- concentrations accumulate in the exoskeleton. Furthermore, low absorption rate (7 to 15%) and a higher excretion rate
Methods (brief)
- and environmental modifications, such as hydroelectric Porto Velho, Rondônia. Fur samples from the orders Roden-
- sure over a long period of time, and causes minimal stress to 63 samples were collected (56 rodents and 7 marsupials).
- relevance and sensitivity to environmental contamination, The samples were washed with 0.01% (w/v) ethylenediami-
- lipore, Bedford, MA, USA). After oven-drying, the samples
- Coendou prehensilis 10 0.005 < LOD–0.229 Arboreal Frugivore/Granivore Patton et al. (2015)
- Isothrix bistriata 08 0.023 < LOD–0.073 Arboreal Herbivore Patton et al. (2015)
- Mesomys hispidus 02 0.011 < LOD–0.023 Arboreal Herbivore Patton et al. (2015)
- Sphiggurus roosmalenorum 04 < LOD – Arboreal Frugivore Patton et al. (2015)
- Data on habits and trophic guilds were compiled from a review of the scientific literature (see “References” column). < LOD: value below the
- were finely cut using acid-cleaned stainless-steel scissors LOD = 3.3(σ/S) and LOQ = 10 (σ/S), where σ is the standard
- Approximately 80 mg of each sample was weighed into 100 and S is the slope of the calibration curve. All material used
- mL glass tubes. To each tube, 4.0 mL of an acidic mixture in the preparation and analysis of the samples was previ-
- (1:1, HNO3:H2SO4; Merck®) was added and the samples ously decontaminated with a nitric acid bath (3%, Merck®).
- were placed in a digestion block (TE-007MP, Tecnal, Piraci-
- the samples remained in the digestion block for an addi- Data normality was assessed using the Shapiro–Wilk test.
- tional 20 min. At room temperature, the samples were left Due to the non-normal distribution, the Mann–Whitney test
- to remove excess KMnO4. The samples were transferred to Kruskal–Wallis test and Dunn’s post hoc test were used for
- mL with ultrapure water (Milli-Q, Millipore, Bedford, MA, tions below the limit of detection (LOD) were not included
Implications
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Update history
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