Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Zooplankton as Mercury Repository in Lake Maggiore (Northern Italy): Biomass Composition and Stable Isotope Analysis |
| Abstract | Total mercury (THg) and methylmercury (MeHg) concentrations were analyzed in zooplankton (>=450 and >=850 µm size fractions) collected seasonally over 6 years in Lake Maggiore (Northern Italy), characterized by a legacy mercury contamination. Analysis of ?N and ?C stable isotopes was carried out to trace how taxa with different trophic levels and carbon sources contributed to mercury concentrations and trends. THg ranged between 44-213 µg kg d.w. and MeHg 15-93 µg kg d.w., representing 24-61% of THg. Values showed strong seasonal variations, with peaks in winter, due to the high biomass of predator taxa (Bythotrephes longimanus, Leptodora kindtii) and of Daphnia longispina-galeata gr. A positive correlation between THg and MeHg and ?N signature was observed. D. longispina-galeata gr. prevailed in both size fractions, substantially contributing to THg and MeHg concentrations. ?C signature was strictly bound to lake thermal circulation dynamics. Mercury stock in the zooplankton compartment ranged between 19-140 ng THg m and 6-44 ng MeHg m for the >=450 µm size fraction and between 2-66 ng THg m and 1-7 ng MeHg m for the >=850 µm fraction, with the highest values in spring when zooplanktivorous fish actively prey in the pelagic zone. The results highlighted the crucial role of zooplankton as a repository of mercury, easily available to higher trophic levels. |
| Source | Water (Basel) 14 (5) |
| Keywords | BioaccumulationDaphniaFreshwater zooplanktonInvertebratesMethylmercury |
| Journal | Water (Basel) |
| Editor | Molecular Diversity Preservation International, Basel, |
| Year | 2022 |
| Type | Articolo in rivista |
| DOI | 10.3390/w14050680 |
| Authors | Marziali, Laura; Piscia, Roberta; Valsecchi, Lucia; Roscioli, Claudio; Manca, Marina |
| Text | 465545 2022 10.3390/w14050680 Scopus 2 s2.0 85125354743 Bioaccumulation Daphnia Freshwater zooplankton Invertebrates Methylmercury Zooplankton as Mercury Repository in Lake Maggiore Northern Italy Biomass Composition and Stable Isotope Analysis Marziali, Laura; Piscia, Roberta; Valsecchi, Lucia; Roscioli, Claudio; Manca, Marina Istituto di Ricerca sulle Acque, Italy; Consiglio Nazionale delle Ricerche Total mercury THg and methylmercury MeHg concentrations were analyzed in zooplankton >=450 and >=850 µm size fractions collected seasonally over 6 years in Lake Maggiore Northern Italy , characterized by a legacy mercury contamination. Analysis of N and C stable isotopes was carried out to trace how taxa with different trophic levels and carbon sources contributed to mercury concentrations and trends. THg ranged between 44 213 µg kg d.w. and MeHg 15 93 µg kg d.w., representing 24 61% of THg. Values showed strong seasonal variations, with peaks in winter, due to the high biomass of predator taxa Bythotrephes longimanus, Leptodora kindtii and of Daphnia longispina galeata gr. A positive correlation between THg and MeHg and N signature was observed. D. longispina galeata gr. prevailed in both size fractions, substantially contributing to THg and MeHg concentrations. C signature was strictly bound to lake thermal circulation dynamics. Mercury stock in the zooplankton compartment ranged between 19 140 ng THg m and 6 44 ng MeHg m for the >=450 µm size fraction and between 2 66 ng THg m and 1 7 ng MeHg m for the >=850 µm fraction, with the highest values in spring when zooplanktivorous fish actively prey in the pelagic zone. The results highlighted the crucial role of zooplankton as a repository of mercury, easily available to higher trophic levels. 14 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85125354743 origin=inward Articolo in rivista Molecular Diversity Preservation International 2073 4441 Water Basel Water Basel Water Basel Water. Basel marinamarcella.manca MANCA MARINA MARCELLA roberta.piscia PISCIA ROBERTA claudiogiovanni.roscioli ROSCIOLI CLAUDIO GIOVANNI laura.marziali MARZIALI LAURA lucia.valsecchi VALSECCHI LUCIA DTA.AD002.218.001 I CH INDAGINI LIMNOLOGICHE SUL LAGO MAGGIORE DTA.AD002.218.002 I CH INDAGINI LIMNOLOGICHE SUL LAGO MAGGIORE 2016 2018 |