Metal body burden and tissue oxidative status in the bivalve Venerupis decussata from Tunisian coastal lagoons

This study investigated the relationship of children's autism symptoms with their toxic metal body burden and red blood cell (RBC) glutathione levels. In children ages 3–8 years, the severity of autism was assessed using four tools: ADOS, PDD-BI, ATEC, and SAS. Toxic metal body burden was assessed by measuring urinary excretion of toxic metals, both before and after oral dimercaptosuccinic acid (DMSA). Multiple positive correlations were found between the severity of autism and the urinary excretion of toxic metals. Variations in the severity of autism measurements could be explained, in part, by regression analyses of urinary excretion of toxic metals before and after DMSA and the level of RBC glutathione (adjusted of 0.22–0.45, in all cases). This study demonstrates a significant positive association between the severity of autism and the relative body burden of toxic metals.

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The Gut Microbial Community Structure of the North American River Otter ( Lontra canadensis ) in the Alberta Oil Sands Region in Canada: Relationship with Local Environmental Variables and Metal Body Burden

Environmental Toxicology and Chemistry ◽

10.1002/etc.4876 ◽

2020 ◽

Vol 39 (12) ◽

pp. 2516-2526

Author(s):

Galen Guo ◽

Kristin M. Eccles ◽

Morgan McMillan ◽

Philippe J. Thomas ◽

Hing Man Chan ◽

...

Keyword(s):

Community Structure ◽

Microbial Community ◽

Oil Sands ◽

Environmental Variables ◽

Body Burden ◽

Lontra Canadensis ◽

The North ◽

American River ◽

Metal Body ◽

Gut Microbial Community

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Differential effects on the toxicity and bioconcentration of hexavalent and trivalent chromium on the rotifer Lecane papuana (Rotifera: Monogononta)

10.21203/rs.3.rs-270218/v1 ◽

2021 ◽

Author(s):

Carlos Vicente Garza-León ◽

Cecilia Alejandra Fernández-Flores ◽

Mario Alberto Arzate-Cárdenas3 ◽

Isidoro Rubio-Franchini ◽

Roberto Rico-Martínez

Keyword(s):

Growth Rate ◽

Environmental Concern ◽

Anthropogenic Activities ◽

Body Burden ◽

Chemical Properties ◽

Intrinsic Growth Rate ◽

Economic Activities ◽

Metal Body ◽

Stable Forms ◽

Demographic Responses

Abstract Heavy metals are still a matter of concern as they might reach aquatic environments due to anthropogenic activities like metal-mechanic or mining, which are part of the main economic activities in different regions around the world. The exposure to chromium may be linked to discharges from automotive and tannery industries, representing a threat to aquatic biota. In the environment, chromium presents two stable forms, the trivalent (CrIII) and the hexavalent (CrVI), which differ on their chemical properties, and thus, on their bioavailability and effects on organisms exposed to this metal. Therefore, this work was aimed to assess the effects of both chromium III and VI on the demographic responses of the rotifer Lecane papuana and describe how the bioconcentration of chromium affects survival and fecundity. For this purpose, acute toxicity (48 h) and chronic toxicity test (alterations on the intrinsic growth rate) were carried out. Moreover, the bioconcentration factor (BCF) and metal body burden (MBB) were estimated after 24-h exposure to either CrIII or CrVI. Our results indicate that CrIII was less toxic according to their respective LC50 values (CrIII = 2.613 mg/L; CrVI = 0.177 mg/L). The intrinsic growth rate was significantly affected by CrIII while CrVI caused no significant changes but only at 0.0885 mg/L, which represents 0.5 of their respective LC50 value. Bioconcentration experiments demonstrated that L. papuana accumulated more CrIII before causing deleterious effects, although it was not as toxic as CrVI, which elicited toxic effects on L. papuana at concentrations of environmental concern.

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