Dépôt numérique

Uptake and Subcellular Distributions of Cadmium and Selenium in Transplanted Aquatic Insect Larvae.

Rosabal, Maikel; Ponton, Dominic; Campbell, Peter G. C.; Hare, Landis (2014). Uptake and Subcellular Distributions of Cadmium and Selenium in Transplanted Aquatic Insect Larvae. Environmental Science & Technology , vol. 48 , nº 21. p. 12654-12661. DOI: 10.1021/es503133g.

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We transplanted larvae of the phantom midge Chaoborus punctipennis from a lake having lower concentrations of Cd and Se (Lake Dasserat) to a more contaminated lake (Lake Dufault) located near to a metal smelter in Rouyn-Noranda, Quebec. Transplanted individuals were held in mesh mesocosms for up to 16 days where they were fed with indigenous contaminated zooplankton. Larval Cd and Se burdens increased over time, and came to equal those measured in indigenous C. punctipennis from contaminated Lake Dufault. Larval Se burdens increased steadily, whereas those of Cd showed an initial lag phase that we explain by a change in the efficiency with which this insect assimilated Cd from its prey. We measured Cd and Se in subcellular fractions and found that larvae sequestered the majority (60%) of the incoming Cd in a detoxified fraction containing metal-binding proteins, whereas a minority of this non-essential metal was in sensitive fractions (20%). In contrast, a much higher proportion of the essential element Se (40%) was apportioned to metabolically-active sensitive fractions. Larvae took up equimolar quantities of these elements over the course of the experiment. Likewise, Cd and Se concentrations in wild larvae were equimolar, which suggests that they are exposed to equimolar bioavailable concentrations of these elements in our study lakes.

Type de document: Article
Mots-clés libres: cadmium; ;akes; smelting
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 avr. 2018 18:30
Dernière modification: 17 avr. 2018 18:30
URI: http://espace.inrs.ca/id/eprint/3787

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