Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Mercury bioaccumulation in benthic invertebrates: From riverine sediments to higher trophic levels |
| Abstract | Riverine sediments are important sites of mercury methylation and benthic invertebrates may be indicators of Hg exposure to higher organisms. From 2014 to 2018, sediments and invertebrates were collected along a mercury gradient in the Toce River (Northern Italy) and analyzed for THg and MeHg. Concentrations in invertebrates, separated according to taxon and to Functional Feeding Group, ranged from 20 to 253 µg kg dry weight (d.w.) for THg, increasing from grazers (Leuctra, Baetis, Serratella) to predators (Perla). MeHg ranged from 3 to 88 µg kg d.w. in biota, rep-resenting 6-53% of THg, while in sediments it was mostly below LOD (0.7 µg kg), accounting for <=3.8% of THg. The Biota-Sediment Accumulation Factor (BSAF, ranging 0.2-4.6) showed an inverse relation to exposure concentrations (THg in sediments, ranging 0.014-0.403 µg kg d.w.) and to organic carbon. THg in invertebrates (up to 73 µg kg wet weight), i.e., at the basal levels of the aquatic trophic chain, exceeded the European Environmental Quality Standard for biota (20 µg kg w.w.), posing potential risks for top predators. Concentrations in adult insects were close to those in aquatic stages, proving active mercury transfer even to terrestrial food chains. |
| Source | Toxics 9 (9) |
| Keywords | Aquatic insectsBioaccumulationFreshwater sedimentsMethylmercury |
| Journal | Toxics |
| Editor | MDPI, Basel, Svizzera |
| Year | 2021 |
| Type | Articolo in rivista |
| DOI | 10.3390/toxics9090197 |
| Authors | Marziali, Laura; Roscioli, Claudio; Valsecchi, Lucia |
| Text | 461562 2021 10.3390/toxics9090197 Scopus 2 s2.0 85113964377 Aquatic insects Bioaccumulation Freshwater sediments Methylmercury Mercury bioaccumulation in benthic invertebrates From riverine sediments to higher trophic levels Marziali, Laura; Roscioli, Claudio; Valsecchi, Lucia Istituto di Ricerca sulle Acque, Italy Riverine sediments are important sites of mercury methylation and benthic invertebrates may be indicators of Hg exposure to higher organisms. From 2014 to 2018, sediments and invertebrates were collected along a mercury gradient in the Toce River Northern Italy and analyzed for THg and MeHg. Concentrations in invertebrates, separated according to taxon and to Functional Feeding Group, ranged from 20 to 253 µg kg dry weight d.w. for THg, increasing from grazers Leuctra, Baetis, Serratella to predators Perla . MeHg ranged from 3 to 88 µg kg d.w. in biota, rep resenting 6 53% of THg, while in sediments it was mostly below LOD 0.7 µg kg , accounting for <=3.8% of THg. The Biota Sediment Accumulation Factor BSAF, ranging 0.2 4.6 showed an inverse relation to exposure concentrations THg in sediments, ranging 0.014 0.403 µg kg d.w. and to organic carbon. THg in invertebrates up to 73 µg kg wet weight , i.e., at the basal levels of the aquatic trophic chain, exceeded the European Environmental Quality Standard for biota 20 µg kg w.w. , posing potential risks for top predators. Concentrations in adult insects were close to those in aquatic stages, proving active mercury transfer even to terrestrial food chains. 9 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85113964377 origin=inward Articolo in rivista MDPI 2305 6304 Toxics Toxics Toxics lucia.valsecchi VALSECCHI LUCIA claudiogiovanni.roscioli ROSCIOLI CLAUDIO GIOVANNI laura.marziali MARZIALI LAURA DTA.AD002.129.001 LAGO MAGGIORE BRUGHERIO |