Silver bioaccumulation in chironomid larvae as a potential source for upper trophic levels: a study case from northern Patagonia View Full Text


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Article Info

DATE

2017-11-04

AUTHORS

Natalia Williams, Andrea Rizzo, María A. Arribére, Diego Añón Suárez, Sergio Ribeiro Guevara

ABSTRACT

Silver (Ag) is a pollutant of high concern in aquatic ecosystems, considered among the most toxic metallic ions. In lacustrine environments, contaminated sediments are a source of Ag for the food web. Chironomidae (Insecta: Diptera) are the most abundant, diverse, and representative insect groups in aquatic ecosystems. Chironomid larvae are closely associated to benthic substrates and link primary producers and secondary consumers. Given their trophic position and their life habits, these larvae can be considered the entry point for the transference of Ag, from the benthic deposit to the higher trophic levels of the food web. Previous studies in lakes from Nahuel Huapi National Park (Northern Patagonia) showed Ag enrichment over background levels (0.04–0.1 μg g−1 dry weight) both in biota (bivalves and fish liver) and sediments from sites near human settlements. The aim of this study was to analyze the role of chironomids in the transference of Ag from the benthic reservoir of Lake Moreno Oeste to the food web. The concentration of Ag in chironomid larvae tissue ranged from 0.1 to 1.5 μg g−1 dry weight, reaching a bioaccumulation factor up to 17 over substrates and depending on the associated substrate type, feeding habitats, larval stage, and season. The main Ag transfer to higher trophic levels by chironomids occurs in the littoral zone, mostly from larvae inhabiting submerged vegetation (Myriophyllum quitense) and sediment from vegetated zones. This study presents novel evidence of the doorway role played by chironomid larvae in Ag pathways from the sediments into food webs of freshwater ecosystems. More... »

PAGES

1921-1932

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  • 1989-12. Metal accumulation by chironomid larvae: the effects of age and body weight on metal body burdens in HYDROBIOLOGIA
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  • 2002-06. Heavy Metal Contamination in Sediments of Lake Nahuel Huapi, Nahuel Huapi National Park, Northern Patagonia, Argentina in WATER, AIR, & SOIL POLLUTION
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11356-017-0656-0

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    http://dx.doi.org/10.1007/s11356-017-0656-0

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1092536932

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/29103123


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    32 schema:description Silver (Ag) is a pollutant of high concern in aquatic ecosystems, considered among the most toxic metallic ions. In lacustrine environments, contaminated sediments are a source of Ag for the food web. Chironomidae (Insecta: Diptera) are the most abundant, diverse, and representative insect groups in aquatic ecosystems. Chironomid larvae are closely associated to benthic substrates and link primary producers and secondary consumers. Given their trophic position and their life habits, these larvae can be considered the entry point for the transference of Ag, from the benthic deposit to the higher trophic levels of the food web. Previous studies in lakes from Nahuel Huapi National Park (Northern Patagonia) showed Ag enrichment over background levels (0.04–0.1 μg g−1 dry weight) both in biota (bivalves and fish liver) and sediments from sites near human settlements. The aim of this study was to analyze the role of chironomids in the transference of Ag from the benthic reservoir of Lake Moreno Oeste to the food web. The concentration of Ag in chironomid larvae tissue ranged from 0.1 to 1.5 μg g−1 dry weight, reaching a bioaccumulation factor up to 17 over substrates and depending on the associated substrate type, feeding habitats, larval stage, and season. The main Ag transfer to higher trophic levels by chironomids occurs in the littoral zone, mostly from larvae inhabiting submerged vegetation (Myriophyllum quitense) and sediment from vegetated zones. This study presents novel evidence of the doorway role played by chironomid larvae in Ag pathways from the sediments into food webs of freshwater ecosystems.
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    44 Lake Moreno Oeste
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    46 Nahuel Huapi National Park
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