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Is it justifiable to pool Chironomus species in trace element contamination studies?

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Proulx, Isabelle; Hare, Landis; Dupré, Bruno (9999). Is it justifiable to pool Chironomus species in trace element contamination studies? Environmental Toxicology and Chemistry . DOI: 10.1002/etc.4294. (Sous Presse)

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Résumé

Larvae of the insect Chironomus (Chironomidae, Diptera) have great potential for estimating the bioavailability of sedimentary trace elements since they are common in fine sediments and tolerate high concentrations of these contaminants. Their use as biomonitors is limited by the fact that they are difficult to identify to species, and species can differ in their trace element concentrations. To determine if pooling species would compromise their use as trace element biomonitors, we identified species of Chironomus larvae collected from 22 lakes and measured their concentrations of 9 trace elements. We found that the concentrations of As, Ba, Co, Cu, Mn and Ni did not generally differ between sympatric Chironomus species, which indicates that they could be pooled for analyses of these trace elements. In contrast, we found that Cd, Se and Zn concentrations differed between species living at the same site according to their feeding behavior, that is, Chironomus species feeding on oxic sediments tended to have higher Cd and Zn concentrations, whereas those feeding on deeper anoxic sediments had higher Se concentrations. Since Se and Zn concentrations in sympatric Chironomus species usually differed by only a factor of two, separating species based on their feeding behavior might not be as crucial as for Cd if larval Se and Zn concentrations vary greatly from site to site.

Type de document: Article
Mots-clés libres: bioaccumulation; bioavailability; Chironomus; metals; sediment assessment
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 oct. 2018 19:03
Dernière modification: 09 oct. 2019 04:00
URI: http://espace.inrs.ca/id/eprint/7686

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